/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.lang3;
  
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicReference;
  import java.util.stream.Collectors;
  
  /**
   * Operates on classes without using reflection.
   *
   * <p>
   * This class handles invalid {@code null} inputs as best it can. Each method documents its behavior in more detail.
   * </p>
   *
   * <p>
   * The notion of a {@code canonical name} includes the human-readable name for the type, for example {@code int[]}. The
   * non-canonical method variants work with the JVM names, such as {@code [I}.
   * </p>
   *
   * @since 2.0
   */
  public class ClassUtils {
  
      /**
       * Inclusivity literals for {@link #hierarchy(Class, Interfaces)}.
       *
       * @since 3.2
       */
      public enum Interfaces {
  
          /** Includes interfaces. */
          INCLUDE,
  
          /** Excludes interfaces. */
          EXCLUDE
      }
  
      /**
       * The maximum number of array dimensions.
       */
      private static final int MAX_DIMENSIONS = 255;
  
      private static final Comparator<Class<?>> COMPARATOR = (o1, o2) -> Objects.compare(getName(o1), getName(o2), String::compareTo);
  
      /**
       * The package separator character: {@code '&#x2e;' == {@value}}.
       */
      public static final char PACKAGE_SEPARATOR_CHAR = '.';
  
      /**
       * The package separator String: {@code "&#x2e;"}.
       */
      public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR);
  
      /**
       * The inner class separator character: {@code '$' == {@value}}.
       */
      public static final char INNER_CLASS_SEPARATOR_CHAR = '$';
  
      /**
       * The inner class separator String: {@code "$"}.
       */
      public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR);
  
      /**
       * Maps names of primitives to their corresponding primitive {@link Class}es.
       */
      private static final Map<String, Class<?>> NAME_PRIMITIVE_MAP = new HashMap<>();
  
      static {
          NAME_PRIMITIVE_MAP.put(Boolean.TYPE.getName(), Boolean.TYPE);
          NAME_PRIMITIVE_MAP.put(Byte.TYPE.getName(), Byte.TYPE);
         NAME_PRIMITIVE_MAP.put(Character.TYPE.getName(), Character.TYPE);
         NAME_PRIMITIVE_MAP.put(Double.TYPE.getName(), Double.TYPE);
         NAME_PRIMITIVE_MAP.put(Float.TYPE.getName(), Float.TYPE);
         NAME_PRIMITIVE_MAP.put(Integer.TYPE.getName(), Integer.TYPE);
         NAME_PRIMITIVE_MAP.put(Long.TYPE.getName(), Long.TYPE);
         NAME_PRIMITIVE_MAP.put(Short.TYPE.getName(), Short.TYPE);
         NAME_PRIMITIVE_MAP.put(Void.TYPE.getName(), Void.TYPE);
     }
 
     /**
      * Maps primitive {@link Class}es to their corresponding wrapper {@link Class}.
      */
     private static final Map<Class<?>, Class<?>> PRIMITIVE_WRAPPER_MAP = new HashMap<>();
 
     static {
         PRIMITIVE_WRAPPER_MAP.put(Boolean.TYPE, Boolean.class);
         PRIMITIVE_WRAPPER_MAP.put(Byte.TYPE, Byte.class);
         PRIMITIVE_WRAPPER_MAP.put(Character.TYPE, Character.class);
         PRIMITIVE_WRAPPER_MAP.put(Short.TYPE, Short.class);
         PRIMITIVE_WRAPPER_MAP.put(Integer.TYPE, Integer.class);
         PRIMITIVE_WRAPPER_MAP.put(Long.TYPE, Long.class);
         PRIMITIVE_WRAPPER_MAP.put(Double.TYPE, Double.class);
         PRIMITIVE_WRAPPER_MAP.put(Float.TYPE, Float.class);
         PRIMITIVE_WRAPPER_MAP.put(Void.TYPE, Void.TYPE);
     }
 
     /**
      * Maps wrapper {@link Class}es to their corresponding primitive types.
      */
     private static final Map<Class<?>, Class<?>> WRAPPER_PRIMITIVE_MAP = new HashMap<>();
 
     static {
         PRIMITIVE_WRAPPER_MAP.forEach((primitiveClass, wrapperClass) -> {
             if (!primitiveClass.equals(wrapperClass)) {
                 WRAPPER_PRIMITIVE_MAP.put(wrapperClass, primitiveClass);
             }
         });
     }
 
     /**
      * Maps a primitive class name to its corresponding abbreviation used in array class names.
      */
     private static final Map<String, String> ABBREVIATION_MAP;
 
     /**
      * Maps an abbreviation used in array class names to corresponding primitive class name.
      */
     private static final Map<String, String> REVERSE_ABBREVIATION_MAP;
 
     /** Feed abbreviation maps. */
     static {
         final Map<String, String> map = new HashMap<>();
         map.put(Integer.TYPE.getName(), "I");
         map.put(Boolean.TYPE.getName(), "Z");
         map.put(Float.TYPE.getName(), "F");
         map.put(Long.TYPE.getName(), "J");
         map.put(Short.TYPE.getName(), "S");
         map.put(Byte.TYPE.getName(), "B");
         map.put(Double.TYPE.getName(), "D");
         map.put(Character.TYPE.getName(), "C");
         ABBREVIATION_MAP = Collections.unmodifiableMap(map);
         REVERSE_ABBREVIATION_MAP = Collections.unmodifiableMap(map.entrySet().stream().collect(Collectors.toMap(Map.Entry::getValue, Map.Entry::getKey)));
     }
 
     /**
      * Gets the class comparator, comparing by class name.
      *
      * @return the class comparator.
      * @since 3.13.0
      */
     public static Comparator<Class<?>> comparator() {
         return COMPARATOR;
     }
 
     /**
      * Given a {@link List} of {@link Class} objects, this method converts them into class names.
      *
      * <p>
      * A new {@link List} is returned. {@code null} objects will be copied into the returned list as {@code null}.
      * </p>
      *
      * @param classes the classes to change
      * @return a {@link List} of class names corresponding to the Class objects, {@code null} if null input
      * @throws ClassCastException if {@code classes} contains a non-{@link Class} entry
      */
     public static List<String> convertClassesToClassNames(final List<Class<?>> classes) {
         return classes == null ? null : classes.stream().map(e -> getName(e, null)).collect(Collectors.toList());
     }
 
     /**
      * Given a {@link List} of class names, this method converts them into classes.
      *
      * <p>
      * A new {@link List} is returned. If the class name cannot be found, {@code null} is stored in the {@link List}. If the
      * class name in the {@link List} is {@code null}, {@code null} is stored in the output {@link List}.
      * </p>
      *
      * @param classNames the classNames to change
      * @return a {@link List} of Class objects corresponding to the class names, {@code null} if null input
      * @throws ClassCastException if classNames contains a non String entry
      */
     public static List<Class<?>> convertClassNamesToClasses(final List<String> classNames) {
         if (classNames == null) {
             return null;
         }
         final List<Class<?>> classes = new ArrayList<>(classNames.size());
         classNames.forEach(className -> {
             try {
                 classes.add(Class.forName(className));
             } catch (final Exception ex) {
                 classes.add(null);
             }
         });
         return classes;
     }
 
     /**
      * Gets the abbreviated name of a {@link Class}.
      *
      * @param cls the class to get the abbreviated name for, may be {@code null}
      * @param lengthHint the desired length of the abbreviated name
      * @return the abbreviated name or an empty string
      * @throws IllegalArgumentException if len &lt;= 0
      * @see #getAbbreviatedName(String, int)
      * @since 3.4
      */
     public static String getAbbreviatedName(final Class<?> cls, final int lengthHint) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getAbbreviatedName(cls.getName(), lengthHint);
     }
 
     /**
      * Gets the abbreviated class name from a {@link String}.
      *
      * <p>
      * The string passed in is assumed to be a class name - it is not checked.
      * </p>
      *
      * <p>
      * The abbreviation algorithm will shorten the class name, usually without significant loss of meaning.
      * </p>
      *
      * <p>
      * The abbreviated class name will always include the complete package hierarchy. If enough space is available,
      * rightmost sub-packages will be displayed in full length. The abbreviated package names will be shortened to a single
      * character.
      * </p>
      * <p>
      * Only package names are shortened, the class simple name remains untouched. (See examples.)
      * </p>
      * <p>
      * The result will be longer than the desired length only if all the package names shortened to a single character plus
      * the class simple name with the separating dots together are longer than the desired length. In other words, when the
      * class name cannot be shortened to the desired length.
      * </p>
      * <p>
      * If the class name can be shortened then the final length will be at most {@code lengthHint} characters.
      * </p>
      * <p>
      * If the {@code lengthHint} is zero or negative then the method throws exception. If you want to achieve the shortest
      * possible version then use {@code 1} as a {@code lengthHint}.
      * </p>
      *
      * <table>
      * <caption>Examples</caption>
      * <tr>
      * <td>className</td>
      * <td>len</td>
      * <td>return</td>
      * </tr>
      * <tr>
      * <td>null</td>
      * <td>1</td>
      * <td>""</td>
      * </tr>
      * <tr>
      * <td>"java.lang.String"</td>
      * <td>5</td>
      * <td>"j.l.String"</td>
      * </tr>
      * <tr>
      * <td>"java.lang.String"</td>
      * <td>15</td>
      * <td>"j.lang.String"</td>
      * </tr>
      * <tr>
      * <td>"java.lang.String"</td>
      * <td>30</td>
      * <td>"java.lang.String"</td>
      * </tr>
      * <tr>
      * <td>"org.apache.commons.lang3.ClassUtils"</td>
      * <td>18</td>
      * <td>"o.a.c.l.ClassUtils"</td>
      * </tr>
      * </table>
      *
      * @param className the className to get the abbreviated name for, may be {@code null}
      * @param lengthHint the desired length of the abbreviated name
      * @return the abbreviated name or an empty string if the specified class name is {@code null} or empty string. The
      *         abbreviated name may be longer than the desired length if it cannot be abbreviated to the desired length.
      * @throws IllegalArgumentException if {@code len <= 0}
      * @since 3.4
      */
     public static String getAbbreviatedName(final String className, final int lengthHint) {
         if (lengthHint <= 0) {
             throw new IllegalArgumentException("len must be > 0");
         }
         if (className == null) {
             return StringUtils.EMPTY;
         }
         if (className.length() <= lengthHint) {
             return className;
         }
         final char[] abbreviated = className.toCharArray();
         int target = 0;
         int source = 0;
         while (source < abbreviated.length) {
             // copy the next part
             int runAheadTarget = target;
             while (source < abbreviated.length && abbreviated[source] != '.') {
                 abbreviated[runAheadTarget++] = abbreviated[source++];
             }
 
             ++target;
             if (useFull(runAheadTarget, source, abbreviated.length, lengthHint) || target > runAheadTarget) {
                 target = runAheadTarget;
             }
 
             // copy the '.' unless it was the last part
             if (source < abbreviated.length) {
                 abbreviated[target++] = abbreviated[source++];
             }
         }
         return new String(abbreviated, 0, target);
     }
 
     /**
      * Gets a {@link List} of all interfaces implemented by the given class and its superclasses.
      *
      * <p>
      * The order is determined by looking through each interface in turn as declared in the source file and following its
      * hierarchy up. Then each superclass is considered in the same way. Later duplicates are ignored, so the order is
      * maintained.
      * </p>
      *
      * @param cls the class to look up, may be {@code null}
      * @return the {@link List} of interfaces in order, {@code null} if null input
      */
     public static List<Class<?>> getAllInterfaces(final Class<?> cls) {
         if (cls == null) {
             return null;
         }
         final LinkedHashSet<Class<?>> interfacesFound = new LinkedHashSet<>();
         getAllInterfaces(cls, interfacesFound);
         return new ArrayList<>(interfacesFound);
     }
 
     /**
      * Gets the interfaces for the specified class.
      *
      * @param cls the class to look up, may be {@code null}
      * @param interfacesFound the {@link Set} of interfaces for the class
      */
     private static void getAllInterfaces(Class<?> cls, final HashSet<Class<?>> interfacesFound) {
         while (cls != null) {
             final Class<?>[] interfaces = cls.getInterfaces();
             for (final Class<?> i : interfaces) {
                 if (interfacesFound.add(i)) {
                     getAllInterfaces(i, interfacesFound);
                 }
             }
             cls = cls.getSuperclass();
         }
     }
 
     /**
      * Gets a {@link List} of superclasses for the given class.
      *
      * @param cls the class to look up, may be {@code null}
      * @return the {@link List} of superclasses in order going up from this one {@code null} if null input
      */
     public static List<Class<?>> getAllSuperclasses(final Class<?> cls) {
         if (cls == null) {
             return null;
         }
         final List<Class<?>> classes = new ArrayList<>();
         Class<?> superclass = cls.getSuperclass();
         while (superclass != null) {
             classes.add(superclass);
             superclass = superclass.getSuperclass();
         }
         return classes;
     }
 
     /**
      * Gets the canonical class name for a {@link Class}.
      *
      * @param cls the class for which to get the canonical class name; may be null
      * @return the canonical name of the class, or the empty String
      * @since 3.7
      * @see Class#getCanonicalName()
      */
     public static String getCanonicalName(final Class<?> cls) {
         return getCanonicalName(cls, StringUtils.EMPTY);
     }
 
     /**
      * Gets the canonical name for a {@link Class}.
      *
      * @param cls the class for which to get the canonical class name; may be null
      * @param valueIfNull the return value if null
      * @return the canonical name of the class, or {@code valueIfNull}
      * @since 3.7
      * @see Class#getCanonicalName()
      */
     public static String getCanonicalName(final Class<?> cls, final String valueIfNull) {
         if (cls == null) {
             return valueIfNull;
         }
         final String canonicalName = cls.getCanonicalName();
         return canonicalName == null ? valueIfNull : canonicalName;
     }
 
     /**
      * Gets the canonical name for an {@link Object}.
      *
      * @param object the object for which to get the canonical class name; may be null
      * @return the canonical name of the object, or the empty String
      * @since 3.7
      * @see Class#getCanonicalName()
      */
     public static String getCanonicalName(final Object object) {
         return getCanonicalName(object, StringUtils.EMPTY);
     }
 
     /**
      * Gets the canonical name for an {@link Object}.
      *
      * @param object the object for which to get the canonical class name; may be null
      * @param valueIfNull the return value if null
      * @return the canonical name of the object or {@code valueIfNull}
      * @since 3.7
      * @see Class#getCanonicalName()
      */
     public static String getCanonicalName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         final String canonicalName = object.getClass().getCanonicalName();
         return canonicalName == null ? valueIfNull : canonicalName;
     }
 
     /**
      * Converts a given name of class into canonical format. If name of class is not a name of array class it returns
      * unchanged name.
      *
      * <p>
      * The method does not change the {@code $} separators in case the class is inner class.
      * </p>
      *
      * <p>
      * Example:
      * <ul>
      * <li>{@code getCanonicalName("[I") = "int[]"}</li>
      * <li>{@code getCanonicalName("[Ljava.lang.String;") = "java.lang.String[]"}</li>
      * <li>{@code getCanonicalName("java.lang.String") = "java.lang.String"}</li>
      * </ul>
      * </p>
      *
      * @param name the name of class.
      * @return canonical form of class name.
      * @throws IllegalArgumentException if the class name is invalid
      */
     private static String getCanonicalName(final String name) {
         String className = StringUtils.deleteWhitespace(name);
         if (className == null) {
             return null;
         }
         int dim = 0;
         final int len = className.length();
         while (dim < len && className.charAt(dim) == '[') {
             dim++;
             if (dim > MAX_DIMENSIONS) {
                 throw new IllegalArgumentException(String.format("Maximum array dimension %d exceeded", MAX_DIMENSIONS));
             }
         }
         if (dim >= len) {
             throw new IllegalArgumentException(String.format("Invalid class name %s", name));
         }
         if (dim < 1) {
             return className;
         }
         className = className.substring(dim);
         if (className.startsWith("L")) {
             if (!className.endsWith(";") || className.length() < 3) {
                 throw new IllegalArgumentException(String.format("Invalid class name %s", name));
             }
             className = className.substring(1, className.length() - 1);
         } else if (className.length() == 1) {
             final String primitive = REVERSE_ABBREVIATION_MAP.get(className.substring(0, 1));
             if (primitive == null) {
                 throw new IllegalArgumentException(String.format("Invalid class name %s", name));
             }
             className = primitive;
         } else {
             throw new IllegalArgumentException(String.format("Invalid class name %s", name));
         }
         final StringBuilder canonicalClassNameBuffer = new StringBuilder(className.length() + dim * 2);
         canonicalClassNameBuffer.append(className);
         for (int i = 0; i < dim; i++) {
             canonicalClassNameBuffer.append("[]");
         }
         return canonicalClassNameBuffer.toString();
     }
 
     /**
      * Gets the (initialized) class represented by {@code className} using the {@code classLoader}. This implementation
      * supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
      * "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
      *
      * @param classLoader the class loader to use to load the class
      * @param className the class name
      * @return the class represented by {@code className} using the {@code classLoader}
      * @throws NullPointerException if the className is null
      * @throws ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final ClassLoader classLoader, final String className) throws ClassNotFoundException {
         return getClass(classLoader, className, true);
     }
 
     /**
      * Gets the class represented by {@code className} using the {@code classLoader}. This implementation supports the
      * syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}", "{@code [Ljava.util.Map.Entry;}", and
      * "{@code [Ljava.util.Map$Entry;}".
      *
      * @param classLoader the class loader to use to load the class
      * @param className the class name
      * @param initialize whether the class must be initialized
      * @return the class represented by {@code className} using the {@code classLoader}
      * @throws NullPointerException if the className is null
      * @throws ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final ClassLoader classLoader, final String className, final boolean initialize) throws ClassNotFoundException {
         // This method was re-written to avoid recursion and stack overflows found by fuzz testing.
         String next = className;
         int lastDotIndex = -1;
         do {
             try {
                 final Class<?> clazz = getPrimitiveClass(next);
                 return clazz != null ? clazz : Class.forName(toCanonicalName(next), initialize, classLoader);
             } catch (final ClassNotFoundException ex) {
                 lastDotIndex = next.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
                 if (lastDotIndex != -1) {
                     next = next.substring(0, lastDotIndex) + INNER_CLASS_SEPARATOR_CHAR + next.substring(lastDotIndex + 1);
                 }
             }
         } while (lastDotIndex != -1);
         throw new ClassNotFoundException(next);
     }
 
     /**
      * Gets the (initialized) class represented by {@code className} using the current thread's context class loader.
      * This implementation supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
      * "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
      *
      * @param className the class name
      * @return the class represented by {@code className} using the current thread's context class loader
      * @throws NullPointerException if the className is null
      * @throws ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final String className) throws ClassNotFoundException {
         return getClass(className, true);
     }
 
     /**
      * Gets the class represented by {@code className} using the current thread's context class loader. This
      * implementation supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
      * "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
      *
      * @param className the class name
      * @param initialize whether the class must be initialized
      * @return the class represented by {@code className} using the current thread's context class loader
      * @throws NullPointerException if the className is null
      * @throws ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final String className, final boolean initialize) throws ClassNotFoundException {
         final ClassLoader contextCL = Thread.currentThread().getContextClassLoader();
         final ClassLoader loader = contextCL == null ? ClassUtils.class.getClassLoader() : contextCL;
         return getClass(loader, className, initialize);
     }
 
     /**
      * Delegates to {@link Class#getComponentType()} using generics.
      *
      * @param <T> The array class type.
      * @param cls A class or null.
      * @return The array component type or null.
      * @see Class#getComponentType()
      * @since 3.13.0
      */
     @SuppressWarnings("unchecked")
     public static <T> Class<T> getComponentType(final Class<T[]> cls) {
         return cls == null ? null : (Class<T>) cls.getComponentType();
     }
 
     /**
      * Null-safe version of {@code cls.getName()}
      *
      * @param cls the class for which to get the class name; may be null
      * @return the class name or the empty string in case the argument is {@code null}
      * @since 3.7
      * @see Class#getSimpleName()
      */
     public static String getName(final Class<?> cls) {
         return getName(cls, StringUtils.EMPTY);
     }
 
     /**
      * Null-safe version of {@code cls.getName()}
      *
      * @param cls the class for which to get the class name; may be null
      * @param valueIfNull the return value if the argument {@code cls} is {@code null}
      * @return the class name or {@code valueIfNull}
      * @since 3.7
      * @see Class#getName()
      */
     public static String getName(final Class<?> cls, final String valueIfNull) {
         return getName(cls, valueIfNull, false);
     }
 
     static String getName(final Class<?> cls, final String valueIfNull, final boolean simple) {
         return cls == null ? valueIfNull : simple ? cls.getSimpleName() : cls.getName();
     }
 
     /**
      * Null-safe version of {@code object.getClass().getName()}
      *
      * @param object the object for which to get the class name; may be null
      * @return the class name or the empty String
      * @since 3.7
      * @see Class#getSimpleName()
      */
     public static String getName(final Object object) {
         return getName(object, StringUtils.EMPTY);
     }
 
     /**
      * Null-safe version of {@code object.getClass().getSimpleName()}
      *
      * @param object the object for which to get the class name; may be null
      * @param valueIfNull the value to return if {@code object} is {@code null}
      * @return the class name or {@code valueIfNull}
      * @since 3.0
      * @see Class#getName()
      */
     public static String getName(final Object object, final String valueIfNull) {
         return object == null ? valueIfNull : object.getClass().getName();
     }
 
     /**
      * Gets the package name from the canonical name of a {@link Class}.
      *
      * @param cls the class to get the package name for, may be {@code null}.
      * @return the package name or an empty string
      * @since 2.4
      */
     public static String getPackageCanonicalName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getPackageCanonicalName(cls.getName());
     }
 
     /**
      * Gets the package name from the class name of an {@link Object}.
      *
      * @param object the class to get the package name for, may be null
      * @param valueIfNull the value to return if null
      * @return the package name of the object, or the null value
      * @since 2.4
      */
     public static String getPackageCanonicalName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getPackageCanonicalName(object.getClass().getName());
     }
 
     /**
      * Gets the package name from the class name.
      *
      * <p>
      * The string passed in is assumed to be a class name - it is not checked.
      * </p>
      * <p>
      * If the class is in the default package, return an empty string.
      * </p>
      *
      * @param name the name to get the package name for, may be {@code null}
      * @return the package name or an empty string
      * @since 2.4
      */
     public static String getPackageCanonicalName(final String name) {
         return getPackageName(getCanonicalName(name));
     }
 
     /**
      * Gets the package name of a {@link Class}.
      *
      * @param cls the class to get the package name for, may be {@code null}.
      * @return the package name or an empty string
      */
     public static String getPackageName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getPackageName(cls.getName());
     }
 
     /**
      * Gets the package name of an {@link Object}.
      *
      * @param object the class to get the package name for, may be null
      * @param valueIfNull the value to return if null
      * @return the package name of the object, or the null value
      */
     public static String getPackageName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getPackageName(object.getClass());
     }
 
     /**
      * Gets the package name from a {@link String}.
      *
      * <p>
      * The string passed in is assumed to be a class name.
      * </p>
      * <p>
      * If the class is unpackaged, return an empty string.
      * </p>
      *
      * @param className the className to get the package name for, may be {@code null}.
      * @return the package name or an empty string.
      */
     public static String getPackageName(String className) {
         if (StringUtils.isEmpty(className)) {
             return StringUtils.EMPTY;
         }
         int i = 0;
         // Strip array encoding
         while (className.charAt(i) == '[') {
             i++;
         }
         className = className.substring(i);
         // Strip Object type encoding
         if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
             className = className.substring(1);
         }
         i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
         if (i == -1) {
             return StringUtils.EMPTY;
         }
         return className.substring(0, i);
     }
 
     /**
      * Gets the primitive class for the given class name, for example "byte".
      *
      * @param className the primitive class for the given class name.
      * @return the primitive class.
      */
     static Class<?> getPrimitiveClass(final String className) {
         return NAME_PRIMITIVE_MAP.get(className);
     }
 
     /**
      * Gets the desired Method much like {@code Class.getMethod}, however it ensures that the returned Method is from a
      * public class or interface and not from an anonymous inner class. This means that the Method is invokable and doesn't
      * fall foul of Java bug (<a href="https://bugs.java.com/bugdatabase/view_bug.do?bug_id=4071957">4071957</a>).
      *
      * <pre>
      *  {@code Set set = Collections.unmodifiableSet(...);
      *  Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty",  new Class[0]);
      *  Object result = method.invoke(set, new Object[]);}
      * </pre>
      *
      * @param cls the class to check, not null
      * @param methodName the name of the method
      * @param parameterTypes the list of parameters
      * @return the method
      * @throws NullPointerException if the class is null
      * @throws SecurityException if a security violation occurred
      * @throws NoSuchMethodException if the method is not found in the given class or if the method doesn't conform with the
      *         requirements
      */
     public static Method getPublicMethod(final Class<?> cls, final String methodName, final Class<?>... parameterTypes) throws NoSuchMethodException {
         final Method declaredMethod = cls.getMethod(methodName, parameterTypes);
         if (isPublic(declaredMethod.getDeclaringClass())) {
             return declaredMethod;
         }
         final List<Class<?>> candidateClasses = new ArrayList<>(getAllInterfaces(cls));
         candidateClasses.addAll(getAllSuperclasses(cls));
         for (final Class<?> candidateClass : candidateClasses) {
             if (!isPublic(candidateClass)) {
                 continue;
             }
             final Method candidateMethod;
             try {
                 candidateMethod = candidateClass.getMethod(methodName, parameterTypes);
             } catch (final NoSuchMethodException ex) {
                 continue;
             }
             if (Modifier.isPublic(candidateMethod.getDeclaringClass().getModifiers())) {
                 return candidateMethod;
             }
         }
         throw new NoSuchMethodException("Can't find a public method for " + methodName + " " + ArrayUtils.toString(parameterTypes));
     }
 
     /**
      * Gets the canonical name minus the package name from a {@link Class}.
      *
      * @param cls the class for which to get the short canonical class name; may be null
      * @return the canonical name without the package name or an empty string
      * @since 2.4
      * @see Class#getCanonicalName()
      */
     public static String getShortCanonicalName(final Class<?> cls) {
         return cls == null ? StringUtils.EMPTY : getShortCanonicalName(cls.getCanonicalName());
     }
 
     /**
      * Gets the canonical name minus the package name for an {@link Object}.
      *
      * @param object the class to get the short name for, may be null
      * @param valueIfNull the value to return if null
      * @return the canonical name of the object without the package name, or the null value
      * @since 2.4
      * @see Class#getCanonicalName()
      */
     public static String getShortCanonicalName(final Object object, final String valueIfNull) {
         return object == null ? valueIfNull : getShortCanonicalName(object.getClass());
     }
 
     /**
      * Gets the canonical name minus the package name from a String.
      *
      * <p>
      * The string passed in is assumed to be a class name - it is not checked.
      * </p>
      *
      * <p>
      * Note that this method is mainly designed to handle the arrays and primitives properly. If the class is an inner class
      * then the result value will not contain the outer classes. This way the behavior of this method is different from
      * {@link #getShortClassName(String)}. The argument in that case is class name and not canonical name and the return
      * value retains the outer classes.
      * </p>
      *
      * <p>
      * Note that there is no way to reliably identify the part of the string representing the package hierarchy and the part
      * that is the outer class or classes in case of an inner class. Trying to find the class would require reflective call
      * and the class itself may not even be on the class path. Relying on the fact that class names start with capital
      * letter and packages with lower case is heuristic.
      * </p>
      *
      * <p>
      * It is recommended to use {@link #getShortClassName(String)} for cases when the class is an inner class and use this
      * method for cases it is designed for.
      * </p>
      *
      * <table>
      * <caption>Examples</caption>
      * <tr>
      * <td>return value</td>
      * <td>input</td>
      * </tr>
      * <tr>
      * <td>{@code ""}</td>
      * <td>{@code (String) null}</td>
      * </tr>
      * <tr>
      * <td>{@code "Map.Entry"}</td>
      * <td>{@code java.util.Map.Entry.class.getName()}</td>
      * </tr>
      * <tr>
      * <td>{@code "Entry"}</td>
      * <td>{@code java.util.Map.Entry.class.getCanonicalName()}</td>
      * </tr>
      * <tr>
      * <td>{@code "ClassUtils"}</td>
      * <td>{@code "org.apache.commons.lang3.ClassUtils"}</td>
      * </tr>
      * <tr>
      * <td>{@code "ClassUtils[]"}</td>
      * <td>{@code "[Lorg.apache.commons.lang3.ClassUtils;"}</td>
      * </tr>
      * <tr>
      * <td>{@code "ClassUtils[][]"}</td>
      * <td>{@code "[[Lorg.apache.commons.lang3.ClassUtils;"}</td>
      * </tr>
      * <tr>
      * <td>{@code "ClassUtils[]"}</td>
      * <td>{@code "org.apache.commons.lang3.ClassUtils[]"}</td>
      * </tr>
      * <tr>
      * <td>{@code "ClassUtils[][]"}</td>
      * <td>{@code "org.apache.commons.lang3.ClassUtils[][]"}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[]"}</td>
      * <td>{@code "[I"}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[]"}</td>
      * <td>{@code int[].class.getCanonicalName()}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[]"}</td>
      * <td>{@code int[].class.getName()}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[][]"}</td>
      * <td>{@code "[[I"}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[]"}</td>
      * <td>{@code "int[]"}</td>
      * </tr>
      * <tr>
      * <td>{@code "int[][]"}</td>
      * <td>{@code "int[][]"}</td>
      * </tr>
      * </table>
      *
      * @param canonicalName the class name to get the short name for
      * @return the canonical name of the class without the package name or an empty string
      * @since 2.4
      */
     public static String getShortCanonicalName(final String canonicalName) {
         return getShortClassName(getCanonicalName(canonicalName));
     }
 
     /**
      * Gets the class name minus the package name from a {@link Class}.
      *
      * <p>
      * This method simply gets the name using {@code Class.getName()} and then calls {@link #getShortClassName(String)}. See
      * relevant notes there.
      * </p>
      *
      * @param cls the class to get the short name for.
      * @return the class name without the package name or an empty string. If the class is an inner class then the returned
      *         value will contain the outer class or classes separated with {@code .} (dot) character.
      */
     public static String getShortClassName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getShortClassName(cls.getName());
     }
 
     /**
      * Gets the class name of the {@code object} without the package name or names.
      *
      * <p>
      * The method looks up the class of the object and then converts the name of the class invoking
      * {@link #getShortClassName(Class)} (see relevant notes there).
      * </p>
      *
      * @param object the class to get the short name for, may be {@code null}
      * @param valueIfNull the value to return if the object is {@code null}
      * @return the class name of the object without the package name, or {@code valueIfNull} if the argument {@code object}
      *         is {@code null}
      */
     public static String getShortClassName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getShortClassName(object.getClass());
     }
 
     /**
      * Gets the class name minus the package name from a String.
      *
      * <p>
      * The string passed in is assumed to be a class name - it is not checked. The string has to be formatted the way as the
      * JDK method {@code Class.getName()} returns it, and not the usual way as we write it, for example in import
      * statements, or as it is formatted by {@code Class.getCanonicalName()}.
      * </p>
      *
      * <p>
      * The difference is significant only in case of classes that are inner classes of some other classes. In this case
      * the separator between the outer and inner class (possibly on multiple hierarchy level) has to be {@code $} (dollar
      * sign) and not {@code .} (dot), as it is returned by {@code Class.getName()}
      * </p>
      *
      * <p>
      * Note that this method is called from the {@link #getShortClassName(Class)} method using the string returned by
      * {@code Class.getName()}.
      * </p>
      *
      * <p>
      * Note that this method differs from {@link #getSimpleName(Class)} in that this will return, for example
      * {@code "Map.Entry"} whilst the {@link Class} variant will simply return {@code "Entry"}. In this example
      * the argument {@code className} is the string {@code java.util.Map$Entry} (note the {@code $} sign).
      * </p>
      *
      * @param className the className to get the short name for. It has to be formatted as returned by
      *        {@code Class.getName()} and not {@code Class.getCanonicalName()}
      * @return the class name of the class without the package name or an empty string. If the class is an inner class then
      *         value contains the outer class or classes and the separator is replaced to be {@code .} (dot) character.
      */
     public static String getShortClassName(String className) {
         if (StringUtils.isEmpty(className)) {
             return StringUtils.EMPTY;
         }
         final StringBuilder arrayPrefix = new StringBuilder();
         // Handle array encoding
         if (className.startsWith("[")) {
             while (className.charAt(0) == '[') {
                 className = className.substring(1);
                 arrayPrefix.append("[]");
             }
             // Strip Object type encoding
             if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
                 className = className.substring(1, className.length() - 1);
             }
             if (REVERSE_ABBREVIATION_MAP.containsKey(className)) {
                 className = REVERSE_ABBREVIATION_MAP.get(className);
             }
         }
         final int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
         final int innerIdx = className.indexOf(INNER_CLASS_SEPARATOR_CHAR, lastDotIdx == -1 ? 0 : lastDotIdx + 1);
         String out = className.substring(lastDotIdx + 1);
         if (innerIdx != -1) {
             out = out.replace(INNER_CLASS_SEPARATOR_CHAR, PACKAGE_SEPARATOR_CHAR);
         }
         return out + arrayPrefix;
     }
 
     /**
      * Null-safe version of {@code cls.getSimpleName()}
      *
      * @param cls the class for which to get the simple name; may be null
      * @return the simple class name or the empty string in case the argument is {@code null}
      * @since 3.0
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Class<?> cls) {
         return getSimpleName(cls, StringUtils.EMPTY);
     }
 
     /**
      * Null-safe version of {@code cls.getSimpleName()}
      *
      * @param cls the class for which to get the simple name; may be null
      * @param valueIfNull the value to return if null
      * @return the simple class name or {@code valueIfNull} if the argument {@code cls} is {@code null}
      * @since 3.0
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Class<?> cls, final String valueIfNull) {
         return cls == null ? valueIfNull : cls.getSimpleName();
     }
 
     /**
      * Null-safe version of {@code object.getClass().getSimpleName()}
      *
      * <p>
      * It is to note that this method is overloaded and in case the argument {@code object} is a {@link Class} object then
      * the {@link #getSimpleName(Class)} will be invoked. If this is a significant possibility then the caller should check
      * this case and call {@code
      * getSimpleName(Class.class)} or just simply use the string literal {@code "Class"}, which is the result of the method
      * in that case.
      * </p>
      *
      * @param object the object for which to get the simple class name; may be null
      * @return the simple class name or the empty string in case the argument is {@code null}
      * @since 3.7
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Object object) {
         return getSimpleName(object, StringUtils.EMPTY);
     }
 
     /**
      * Null-safe version of {@code object.getClass().getSimpleName()}
      *
      * @param object the object for which to get the simple class name; may be null
      * @param valueIfNull the value to return if {@code object} is {@code null}
      * @return the simple class name or {@code valueIfNull} if the argument {@code object} is {@code null}
      * @since 3.0
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Object object, final String valueIfNull) {
         return object == null ? valueIfNull : object.getClass().getSimpleName();
     }
 
     /**
      * Gets an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order,
      * excluding interfaces.
      *
      * @param type the type to get the class hierarchy from
      * @return Iterable an Iterable over the class hierarchy of the given class
      * @since 3.2
      */
     public static Iterable<Class<?>> hierarchy(final Class<?> type) {
         return hierarchy(type, Interfaces.EXCLUDE);
     }
 
     /**
      * Gets an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order.
      *
      * @param type the type to get the class hierarchy from
      * @param interfacesBehavior switch indicating whether to include or exclude interfaces
      * @return Iterable an Iterable over the class hierarchy of the given class
      * @since 3.2
      */
     public static Iterable<Class<?>> hierarchy(final Class<?> type, final Interfaces interfacesBehavior) {
         final Iterable<Class<?>> classes = () -> {
             final AtomicReference<Class<?>> next = new AtomicReference<>(type);
             return new Iterator<Class<?>>() {
 
                 @Override
                 public boolean hasNext() {
                     return next.get() != null;
                 }
 
                 @Override
                 public Class<?> next() {
                     return next.getAndUpdate(Class::getSuperclass);
                 }
 
                 @Override
                 public void remove() {
                     throw new UnsupportedOperationException();
                 }
 
             };
         };
         if (interfacesBehavior != Interfaces.INCLUDE) {
             return classes;
         }
         return () -> {
             final Set<Class<?>> seenInterfaces = new HashSet<>();
             final Iterator<Class<?>> wrapped = classes.iterator();
 
             return new Iterator<Class<?>>() {
                 Iterator<Class<?>> interfaces = Collections.emptyIterator();
 
                 @Override
                 public boolean hasNext() {
                     return interfaces.hasNext() || wrapped.hasNext();
                 }
 
                 @Override
                 public Class<?> next() {
                     if (interfaces.hasNext()) {
                         final Class<?> nextInterface = interfaces.next();
                         seenInterfaces.add(nextInterface);
                         return nextInterface;
                     }
                     final Class<?> nextSuperclass = wrapped.next();
                     final Set<Class<?>> currentInterfaces = new LinkedHashSet<>();
                     walkInterfaces(currentInterfaces, nextSuperclass);
                     interfaces = currentInterfaces.iterator();
                     return nextSuperclass;
                 }
 
                 @Override
                 public void remove() {
                     throw new UnsupportedOperationException();
                 }
 
                 private void walkInterfaces(final Set<Class<?>> addTo, final Class<?> c) {
                     for (final Class<?> iface : c.getInterfaces()) {
                         if (!seenInterfaces.contains(iface)) {
                             addTo.add(iface);
                         }
                         walkInterfaces(addTo, iface);
                     }
                 }
 
             };
         };
     }
 
     /**
      * Tests whether one {@link Class} can be assigned to a variable of another {@link Class}.
      *
      * <p>
      * Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
      * primitive classes and {@code null}s.
      * </p>
      *
      * <p>
      * Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result
      * for these cases.
      * </p>
      *
      * <p>
      * {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
      * and the toClass is non-primitive.
      * </p>
      *
      * <p>
      * Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
      * converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
      * widening reference conversion. See <em><a href="https://docs.oracle.com/javase/specs/">The Java Language
      * Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
      * </p>
      *
      * <p>
      * <strong>Since Lang 3.0,</strong> this method will default behavior for calculating assignability between primitive
      * and wrapper types <em>corresponding to the running Java version</em>; i.e. autoboxing will be the default behavior in
      * VMs running Java versions &gt; 1.5.
      * </p>
      *
      * @param cls the Class to check, may be null
      * @param toClass the Class to try to assign into, returns false if null
      * @return {@code true} if assignment possible
      */
     public static boolean isAssignable(final Class<?> cls, final Class<?> toClass) {
         return isAssignable(cls, toClass, true);
     }
 
     /**
      * Tests whether one {@link Class} can be assigned to a variable of another {@link Class}.
      *
      * <p>
      * Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
      * primitive classes and {@code null}s.
      * </p>
      *
      * <p>
      * Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result
      * for these cases.
      * </p>
      *
      * <p>
      * {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
      * and the toClass is non-primitive.
      * </p>
      *
      * <p>
      * Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
      * converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
      * widening reference conversion. See <em><a href="https://docs.oracle.com/javase/specs/">The Java Language
      * Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
      * </p>
      *
      * @param cls the Class to check, may be null
      * @param toClass the Class to try to assign into, returns false if null
      * @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers
      * @return {@code true} if assignment possible
      */
     public static boolean isAssignable(Class<?> cls, final Class<?> toClass, final boolean autoboxing) {
         if (toClass == null) {
             return false;
         }
         // have to check for null, as isAssignableFrom doesn't
         if (cls == null) {
             return !toClass.isPrimitive();
         }
         // autoboxing:
         if (autoboxing) {
             if (cls.isPrimitive() && !toClass.isPrimitive()) {
                 cls = primitiveToWrapper(cls);
                 if (cls == null) {
                     return false;
                 }
             }
             if (toClass.isPrimitive() && !cls.isPrimitive()) {
                 cls = wrapperToPrimitive(cls);
                 if (cls == null) {
                     return false;
                 }
             }
         }
         if (cls.equals(toClass)) {
             return true;
         }
         if (cls.isPrimitive()) {
             if (!toClass.isPrimitive()) {
                 return false;
             }
             if (Integer.TYPE.equals(cls)) {
                 return Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
             }
             if (Long.TYPE.equals(cls)) {
                 return Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
             }
             if (Boolean.TYPE.equals(cls)) {
                 return false;
             }
             if (Double.TYPE.equals(cls)) {
                 return false;
             }
             if (Float.TYPE.equals(cls)) {
                 return Double.TYPE.equals(toClass);
             }
             if (Character.TYPE.equals(cls)  || Short.TYPE.equals(cls)) {
                 return Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
             }
             if (Byte.TYPE.equals(cls)) {
                 return Short.TYPE.equals(toClass) || Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass)
                     || Double.TYPE.equals(toClass);
             }
             // should never get here
             return false;
         }
         return toClass.isAssignableFrom(cls);
     }
 
     /**
      * Tests whether an array of Classes can be assigned to another array of Classes.
      *
      * <p>
      * This method calls {@link #isAssignable(Class, Class) isAssignable} for each Class pair in the input arrays. It can be
      * used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter
      * types (the second parameter).
      * </p>
      *
      * <p>
      * Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
      * primitive classes and {@code null}s.
      * </p>
      *
      * <p>
      * Primitive widenings allow an int to be assigned to a {@code long}, {@code float} or {@code double}. This method
      * returns the correct result for these cases.
      * </p>
      *
      * <p>
      * {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
      * and the toClass is non-primitive.
      * </p>
      *
      * <p>
      * Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
      * converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
      * widening reference conversion. See <em><a href="https://docs.oracle.com/javase/specs/">The Java Language
      * Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
      * </p>
      *
      * <p>
      * <strong>Since Lang 3.0,</strong> this method will default behavior for calculating assignability between primitive
      * and wrapper types <em>corresponding to the running Java version</em>; i.e. autoboxing will be the default behavior in
      * VMs running Java versions &gt; 1.5.
      * </p>
      *
      * @param classArray the array of Classes to check, may be {@code null}
      * @param toClassArray the array of Classes to try to assign into, may be {@code null}
      * @return {@code true} if assignment possible
      */
     public static boolean isAssignable(final Class<?>[] classArray, final Class<?>... toClassArray) {
         return isAssignable(classArray, toClassArray, true);
     }
 
     /**
      * Tests whether an array of Classes can be assigned to another array of Classes.
      *
      * <p>
      * This method calls {@link #isAssignable(Class, Class) isAssignable} for each Class pair in the input arrays. It can be
      * used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter
      * types (the second parameter).
      * </p>
      *
      * <p>
      * Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
      * primitive classes and {@code null}s.
      * </p>
      *
      * <p>
      * Primitive widenings allow an int to be assigned to a {@code long}, {@code float} or {@code double}. This method
      * returns the correct result for these cases.
      * </p>
      *
      * <p>
      * {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
      * and the toClass is non-primitive.
      * </p>
      *
      * <p>
      * Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
      * converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
      * widening reference conversion. See <em><a href="https://docs.oracle.com/javase/specs/">The Java Language
      * Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
      * </p>
      *
      * @param classArray the array of Classes to check, may be {@code null}
      * @param toClassArray the array of Classes to try to assign into, may be {@code null}
      * @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers
      * @return {@code true} if assignment possible
      */
     public static boolean isAssignable(Class<?>[] classArray, Class<?>[] toClassArray, final boolean autoboxing) {
         if (!ArrayUtils.isSameLength(classArray, toClassArray)) {
             return false;
         }
         classArray = ArrayUtils.nullToEmpty(classArray);
         toClassArray = ArrayUtils.nullToEmpty(toClassArray);
         for (int i = 0; i < classArray.length; i++) {
             if (!isAssignable(classArray[i], toClassArray[i], autoboxing)) {
                 return false;
             }
         }
         return true;
     }
 
     /**
      * Tests whether the specified class an inner class or static nested class.
      *
      * @param cls the class to check, may be null
      * @return {@code true} if the class is an inner or static nested class, false if not or {@code null}
      */
     public static boolean isInnerClass(final Class<?> cls) {
         return cls != null && cls.getEnclosingClass() != null;
     }
 
     /**
      * Tests whether the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte},
      * {@link Character}, {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
      *
      * @param type The class to query or null.
      * @return true if the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte},
      *         {@link Character}, {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
      * @since 3.1
      */
     public static boolean isPrimitiveOrWrapper(final Class<?> type) {
         return type != null && type.isPrimitive() || isPrimitiveWrapper(type);
     }
 
     /**
      * Tests whether the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
      * {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
      *
      * @param type The class to query or null.
      * @return true if the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
      *         {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
      * @since 3.1
      */
     public static boolean isPrimitiveWrapper(final Class<?> type) {
         return WRAPPER_PRIMITIVE_MAP.containsKey(type);
     }
 
     /**
      * Tests whether a {@link Class} is public.
      *
      * @param cls Class to test.
      * @return {@code true} if {@code cls} is public.
      * @since 3.13.0
      */
     public static boolean isPublic(final Class<?> cls) {
         return Modifier.isPublic(cls.getModifiers());
     }
 
     /**
      * Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.
      *
      * @param classes the class array to convert, may be null or empty.
      * @return an array which contains for each given class, the wrapper class or the original class if class is not a primitive. {@code null} if null input.
      *         Empty array if an empty array passed in.
      * @since 2.1
      */
     public static Class<?>[] primitivesToWrappers(final Class<?>... classes) {
         if (classes == null) {
             return null;
         }
         if (classes.length == 0) {
             return classes;
         }
         return ArrayUtils.setAll(new Class[classes.length], i -> primitiveToWrapper(classes[i]));
     }
 
     /**
      * Converts the specified primitive Class object to its corresponding wrapper Class object.
      *
      * <p>
      * NOTE: From v2.2, this method handles {@code Void.TYPE}, returning {@code Void.TYPE}.
      * </p>
      *
      * @param cls the class to convert, may be null.
      * @return the wrapper class for {@code cls} or {@code cls} if {@code cls} is not a primitive. {@code null} if null input.
      * @since 2.1
      */
     public static Class<?> primitiveToWrapper(final Class<?> cls) {
         return cls != null && cls.isPrimitive() ? PRIMITIVE_WRAPPER_MAP.get(cls) : cls;
     }
 
     /**
      * Converts a class name to a JLS style class name.
      *
      * @param className the class name
      * @return the converted name
      * @throws NullPointerException if the className is null
      */
     private static String toCanonicalName(final String className) {
         String canonicalName = StringUtils.deleteWhitespace(className);
         Objects.requireNonNull(canonicalName, "className");
         final String arrayMarker = "[]";
         if (canonicalName.endsWith(arrayMarker)) {
             final StringBuilder classNameBuffer = new StringBuilder();
             while (canonicalName.endsWith(arrayMarker)) {
                 canonicalName = canonicalName.substring(0, canonicalName.length() - 2);
                 classNameBuffer.append("[");
             }
             final String abbreviation = ABBREVIATION_MAP.get(canonicalName);
             if (abbreviation != null) {
                 classNameBuffer.append(abbreviation);
             } else {
                 classNameBuffer.append("L").append(canonicalName).append(";");
             }
             canonicalName = classNameBuffer.toString();
         }
         return canonicalName;
     }
 
     /**
      * Converts an array of {@link Object} in to an array of {@link Class} objects. If any of these objects is null, a null element will be inserted into the
      * array.
      *
      * <p>
      * This method returns {@code null} for a {@code null} input array.
      * </p>
      *
      * @param array an {@link Object} array
      * @return a {@link Class} array, {@code null} if null array input
      * @since 2.4
      */
     public static Class<?>[] toClass(final Object... array) {
         if (array == null) {
             return null;
         }
         if (array.length == 0) {
             return ArrayUtils.EMPTY_CLASS_ARRAY;
         }
         return ArrayUtils.setAll(new Class[array.length], i -> array[i] == null ? null : array[i].getClass());
     }
 
     /**
      * Decides if the part that was just copied to its destination location in the work array can be kept as it was copied
      * or must be abbreviated. It must be kept when the part is the last one, which is the simple name of the class. In this
      * case the {@code source} index, from where the characters are copied points one position after the last character,
      * a.k.a. {@code source ==
      * originalLength}
      *
      * <p>
      * If the part is not the last one then it can be kept unabridged if the number of the characters copied so far plus the
      * character that are to be copied is less than or equal to the desired length.
      * </p>
      *
      * @param runAheadTarget the target index (where the characters were copied to) pointing after the last character copied
      *        when the current part was copied
      * @param source the source index (where the characters were copied from) pointing after the last character copied when
      *        the current part was copied
      * @param originalLength the original length of the class full name, which is abbreviated
      * @param desiredLength the desired length of the abbreviated class name
      * @return {@code true} if it can be kept in its original length {@code false} if the current part has to be abbreviated
      *         and
      */
     private static boolean useFull(final int runAheadTarget, final int source, final int originalLength, final int desiredLength) {
         return source >= originalLength || runAheadTarget + originalLength - source <= desiredLength;
     }
 
     /**
      * Converts the specified array of wrapper Class objects to an array of its corresponding primitive Class objects.
      *
      * <p>
      * This method invokes {@code wrapperToPrimitive()} for each element of the passed in array.
      * </p>
      *
      * @param classes the class array to convert, may be null or empty
      * @return an array which contains for each given class, the primitive class or <strong>null</strong> if the original class is not a wrapper class.
      *         {@code null} if null input. Empty array if an empty array passed in.
      * @see #wrapperToPrimitive(Class)
      * @since 2.4
      */
     public static Class<?>[] wrappersToPrimitives(final Class<?>... classes) {
         if (classes == null) {
             return null;
         }
         if (classes.length == 0) {
             return classes;
         }
         return ArrayUtils.setAll(new Class[classes.length], i -> wrapperToPrimitive(classes[i]));
     }
 
     /**
      * Converts the specified wrapper class to its corresponding primitive class.
      *
      * <p>
      * This method is the counter part of {@code primitiveToWrapper()}. If the passed in class is a wrapper class for a
      * primitive type, this primitive type will be returned (e.g. {@code Integer.TYPE} for {@code Integer.class}). For other
      * classes, or if the parameter is <strong>null</strong>, the return value is <strong>null</strong>.
      * </p>
      *
      * @param cls the class to convert, may be <strong>null</strong>
      * @return the corresponding primitive type if {@code cls} is a wrapper class, <strong>null</strong> otherwise
      * @see #primitiveToWrapper(Class)
      * @since 2.4
      */
     public static Class<?> wrapperToPrimitive(final Class<?> cls) {
         return WRAPPER_PRIMITIVE_MAP.get(cls);
     }
 
     /**
      * ClassUtils instances should NOT be constructed in standard programming. Instead, the class should be used as
      * {@code ClassUtils.getShortClassName(cls)}.
      *
      * <p>
      * This constructor is public to permit tools that require a JavaBean instance to operate.
      * </p>
      *
      * @deprecated TODO Make private in 4.0.
      */
     @Deprecated
     public ClassUtils() {
         // empty
     }
 
 }