Coverage Report

Coverage Report - org.apache.commons.lang3.ClassUtils

Classes in this File
Line Coverage
Branch Coverage
Complexity
ClassUtils
95%
268/280
93%
212/226
4.975
 /*
  * 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
  *
  *      http://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.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 
 
 /**
  * <p>Operates on classes without using reflection.</p>
  *
  * <p>This class handles invalid {@code null} inputs as best it can.
  * Each method documents its behaviour 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
  * @version $Id: ClassUtils.java 1436770 2013-01-22 07:09:45Z ggregory $
  */
 public class ClassUtils {
 
     /**
      * <p>The package separator character: <code>'&#x2e;' == {@value}</code>.</p>
      */
     public static final char PACKAGE_SEPARATOR_CHAR = '.';
 
     /**
      * <p>The package separator String: <code>"&#x2e;"</code>.</p>
      */
     public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR);
 
     /**
      * <p>The inner class separator character: <code>'$' == {@value}</code>.</p>
      */
     public static final char INNER_CLASS_SEPARATOR_CHAR = '$';
 
     /**
      * <p>The inner class separator String: {@code "$"}.</p>
      */
     public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR);
 
     /**
      * Maps primitive {@code Class}es to their corresponding wrapper {@code Class}.
      */
     private static final Map<Class<?>, Class<?>> primitiveWrapperMap = new HashMap<Class<?>, Class<?>>();
     static {
          primitiveWrapperMap.put(Boolean.TYPE, Boolean.class);
          primitiveWrapperMap.put(Byte.TYPE, Byte.class);
          primitiveWrapperMap.put(Character.TYPE, Character.class);
          primitiveWrapperMap.put(Short.TYPE, Short.class);
          primitiveWrapperMap.put(Integer.TYPE, Integer.class);
          primitiveWrapperMap.put(Long.TYPE, Long.class);
          primitiveWrapperMap.put(Double.TYPE, Double.class);
          primitiveWrapperMap.put(Float.TYPE, Float.class);
          primitiveWrapperMap.put(Void.TYPE, Void.TYPE);
     }
 
     /**
      * Maps wrapper {@code Class}es to their corresponding primitive types.
      */
     private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<Class<?>, Class<?>>();
     static {
         for (final Class<?> primitiveClass : primitiveWrapperMap.keySet()) {
             final Class<?> wrapperClass = primitiveWrapperMap.get(primitiveClass);
             if (!primitiveClass.equals(wrapperClass)) {
                 wrapperPrimitiveMap.put(wrapperClass, primitiveClass);
             }
         }
     }
 
     /**
      * Maps a primitive class name to its corresponding abbreviation used in array class names.
      */
     private static final Map<String, String> abbreviationMap = new HashMap<String, String>();
 
     /**
      * Maps an abbreviation used in array class names to corresponding primitive class name.
      */
     private static final Map<String, String> reverseAbbreviationMap = new HashMap<String, String>();
 
     /**
      * Add primitive type abbreviation to maps of abbreviations.
      *
      * @param primitive Canonical name of primitive type
      * @param abbreviation Corresponding abbreviation of primitive type
      */
     private static void addAbbreviation(final String primitive, final String abbreviation) {
         abbreviationMap.put(primitive, abbreviation);
         reverseAbbreviationMap.put(abbreviation, primitive);
     }
 
     /**
      * Feed abbreviation maps
      */
     static {
         addAbbreviation("int", "I");
         addAbbreviation("boolean", "Z");
         addAbbreviation("float", "F");
         addAbbreviation("long", "J");
         addAbbreviation("short", "S");
         addAbbreviation("byte", "B");
         addAbbreviation("double", "D");
         addAbbreviation("char", "C");
     }
 
     /**
      * <p>ClassUtils instances should NOT be constructed in standard programming.
      * Instead, the class should be used as
      * {@code ClassUtils.getShortClassName(cls)}.</p>
      *
      * <p>This constructor is public to permit tools that require a JavaBean
      * instance to operate.</p>
      */
     public ClassUtils() {
       super();
     }
 
     // Short class name
     // ----------------------------------------------------------------------
     /**
      * <p>Gets the class name minus the package name for an {@code Object}.</p>
      *
      * @param object  the class to get the short name for, may be null
      * @param valueIfNull  the value to return if null
      * @return the class name of the object without the package name, or the null value
      */
     public static String getShortClassName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getShortClassName(object.getClass());
     }
 
     /**
      * <p>Gets the class name minus the package name from a {@code Class}.</p>
      * 
      * <p>Consider using the Java 5 API {@link Class#getSimpleName()} instead. 
      * The one known difference is that this code will return {@code "Map.Entry"} while 
      * the {@code java.lang.Class} variant will simply return {@code "Entry"}. </p>
      *
      * @param cls  the class to get the short name for.
      * @return the class name without the package name or an empty string
      */
     public static String getShortClassName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getShortClassName(cls.getName());
     }
 
     /**
      * <p>Gets the class name minus the package name from a String.</p>
      *
      * <p>The string passed in is assumed to be a class name - it is not checked.</p>
 
      * <p>Note that this method differs from Class.getSimpleName() in that this will 
      * return {@code "Map.Entry"} whilst the {@code java.lang.Class} variant will simply 
      * return {@code "Entry"}. </p>
      *
      * @param className  the className to get the short name for
      * @return the class name of the class without the package name or an empty string
      */
     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 (reverseAbbreviationMap.containsKey(className)) {
             className = reverseAbbreviationMap.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;
     }
 
     /**
      * <p>Null-safe version of <code>aClass.getSimpleName()</code></p>
      *
      * @param cls the class for which to get the simple name.
      * @return the simple class name.
      * @since 3.0
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return cls.getSimpleName();
     }
 
     /**
      * <p>Null-safe version of <code>aClass.getSimpleName()</code></p>
      *
      * @param object the object for which to get the simple class name.
      * @param valueIfNull the value to return if <code>object</code> is <code>null</code>
      * @return the simple class name.
      * @since 3.0
      * @see Class#getSimpleName()
      */
     public static String getSimpleName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getSimpleName(object.getClass());
     }
 
     // Package name
     // ----------------------------------------------------------------------
     /**
      * <p>Gets the package name of an {@code Object}.</p>
      *
      * @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());
     }
 
     /**
      * <p>Gets the package name of a {@code Class}.</p>
      *
      * @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());
     }
 
     /**
      * <p>Gets the package name from a {@code String}.</p>
      *
      * <p>The string passed in is assumed to be a class name - it is not checked.</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;
         }
 
         // Strip array encoding
         while (className.charAt(0) == '[') {
             className = className.substring(1);
         }
         // Strip Object type encoding
         if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
             className = className.substring(1);
         }
 
         final int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
         if (i == -1) {
             return StringUtils.EMPTY;
         }
         return className.substring(0, i);
     }
 
     // Superclasses/Superinterfaces
     // ----------------------------------------------------------------------
     /**
      * <p>Gets a {@code List} of superclasses for the given class.</p>
      *
      * @param cls  the class to look up, may be {@code null}
      * @return the {@code 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<?>>();
         Class<?> superclass = cls.getSuperclass();
         while (superclass != null) {
             classes.add(superclass);
             superclass = superclass.getSuperclass();
         }
         return classes;
     }
 
     /**
      * <p>Gets a {@code List} of all interfaces implemented by the given
      * class and its superclasses.</p>
      *
      * <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 {@code 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<Class<?>>();
         getAllInterfaces(cls, interfacesFound);
 
         return new ArrayList<Class<?>>(interfacesFound);
     }
 
     /**
      * Get the interfaces for the specified class.
      *
      * @param cls  the class to look up, may be {@code null}
      * @param interfacesFound the {@code 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();
          }
      }
 
     // Convert list
     // ----------------------------------------------------------------------
     /**
      * <p>Given a {@code List} of class names, this method converts them into classes.</p>
      *
      * <p>A new {@code List} is returned. If the class name cannot be found, {@code null}
      * is stored in the {@code List}. If the class name in the {@code List} is
      * {@code null}, {@code null} is stored in the output {@code List}.</p>
      *
      * @param classNames  the classNames to change
      * @return a {@code 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<Class<?>>(classNames.size());
         for (final String className : classNames) {
             try {
                 classes.add(Class.forName(className));
             } catch (final Exception ex) {
                 classes.add(null);
             }
         }
         return classes;
     }
 
     /**
      * <p>Given a {@code List} of {@code Class} objects, this method converts
      * them into class names.</p>
      *
      * <p>A new {@code 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 {@code List} of class names corresponding to the Class objects,
      *  {@code null} if null input
      * @throws ClassCastException if {@code classes} contains a non-{@code Class} entry
      */
     public static List<String> convertClassesToClassNames(final List<Class<?>> classes) {
         if (classes == null) {
             return null;
         }
         final List<String> classNames = new ArrayList<String>(classes.size());
         for (final Class<?> cls : classes) {
             if (cls == null) {
                 classNames.add(null);
             } else {
                 classNames.add(cls.getName());
             }
         }
         return classNames;
     }
 
     // Is assignable
     // ----------------------------------------------------------------------
     /**
      * <p>Checks if an array of Classes can be assigned to another array of Classes.</p>
      *
      * <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 {@code Class} parameter can be converted to the type
      * represented by this {@code Class} object via an identity conversion
      * widening primitive or widening reference conversion. See
      * <em><a href="http://java.sun.com/docs/books/jls/">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 >= 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, SystemUtils.isJavaVersionAtLeast(JavaVersion.JAVA_1_5));
     }
 
     /**
      * <p>Checks if an array of Classes can be assigned to another array of Classes.</p>
      *
      * <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 {@code Class} parameter can be converted to the type
      * represented by this {@code Class} object via an identity conversion
      * widening primitive or widening reference conversion. See
      * <em><a href="http://java.sun.com/docs/books/jls/">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) == false) {
             return false;
         }
         if (classArray == null) {
             classArray = ArrayUtils.EMPTY_CLASS_ARRAY;
         }
         if (toClassArray == null) {
             toClassArray = ArrayUtils.EMPTY_CLASS_ARRAY;
         }
         for (int i = 0; i < classArray.length; i++) {
             if (isAssignable(classArray[i], toClassArray[i], autoboxing) == false) {
                 return false;
             }
         }
         return true;
     }
 
     /**
      * Returns 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) {
         if (type == null) {
             return false;
         }
         return type.isPrimitive() || isPrimitiveWrapper(type);
     }
 
     /**
      * Returns 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 wrapperPrimitiveMap.containsKey(type);
     }
 
     /**
      * <p>Checks if one {@code Class} can be assigned to a variable of
      * another {@code Class}.</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 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 {@code Class} parameter can be converted to the type
      * represented by this {@code Class} object via an identity conversion
      * widening primitive or widening reference conversion. See
      * <em><a href="http://java.sun.com/docs/books/jls/">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 >= 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, SystemUtils.isJavaVersionAtLeast(JavaVersion.JAVA_1_5));
     }
 
     /**
      * <p>Checks if one {@code Class} can be assigned to a variable of
      * another {@code Class}.</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 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 {@code Class} parameter can be converted to the type
      * represented by this {@code Class} object via an identity conversion
      * widening primitive or widening reference conversion. See
      * <em><a href="http://java.sun.com/docs/books/jls/">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() == false) {
                 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)) {
                 return Integer.TYPE.equals(toClass)
                     || Long.TYPE.equals(toClass)
                     || Float.TYPE.equals(toClass)
                     || Double.TYPE.equals(toClass);
             }
             if (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);
     }
 
     /**
      * <p>Converts the specified primitive Class object to its corresponding
      * wrapper Class object.</p>
      *
      * <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) {
         Class<?> convertedClass = cls;
         if (cls != null && cls.isPrimitive()) {
             convertedClass = primitiveWrapperMap.get(cls);
         }
         return convertedClass;
     }
 
     /**
      * <p>Converts the specified array of primitive Class objects to an array of
      * its corresponding wrapper Class objects.</p>
      *
      * @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;
         }
 
         final Class<?>[] convertedClasses = new Class[classes.length];
         for (int i = 0; i < classes.length; i++) {
             convertedClasses[i] = primitiveToWrapper(classes[i]);
         }
         return convertedClasses;
     }
 
     /**
      * <p>Converts the specified wrapper class to its corresponding primitive
      * class.</p>
      *
      * <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
      * <b>null</b>, the return value is <b>null</b>.</p>
      *
      * @param cls the class to convert, may be <b>null</b>
      * @return the corresponding primitive type if {@code cls} is a
      * wrapper class, <b>null</b> otherwise
      * @see #primitiveToWrapper(Class)
      * @since 2.4
      */
     public static Class<?> wrapperToPrimitive(final Class<?> cls) {
         return wrapperPrimitiveMap.get(cls);
     }
 
     /**
      * <p>Converts the specified array of wrapper Class objects to an array of
      * its corresponding primitive Class objects.</p>
      *
      * <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
      * <b>null</b> 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;
         }
 
         final Class<?>[] convertedClasses = new Class[classes.length];
         for (int i = 0; i < classes.length; i++) {
             convertedClasses[i] = wrapperToPrimitive(classes[i]);
         }
         return convertedClasses;
     }
 
     // Inner class
     // ----------------------------------------------------------------------
     /**
      * <p>Is the specified class an inner class or static nested class.</p>
      *
      * @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;
     }
 
     // Class loading
     // ----------------------------------------------------------------------
     /**
      * Returns 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 ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(
             final ClassLoader classLoader, final String className, final boolean initialize) throws ClassNotFoundException {
         try {
             Class<?> clazz;
             if (abbreviationMap.containsKey(className)) {
                 final String clsName = "[" + abbreviationMap.get(className);
                 clazz = Class.forName(clsName, initialize, classLoader).getComponentType();
             } else {
                 clazz = Class.forName(toCanonicalName(className), initialize, classLoader);
             }
             return clazz;
         } catch (final ClassNotFoundException ex) {
             // allow path separators (.) as inner class name separators
             final int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
 
             if (lastDotIndex != -1) {
                 try {
                     return getClass(classLoader, className.substring(0, lastDotIndex) +
                             INNER_CLASS_SEPARATOR_CHAR + className.substring(lastDotIndex + 1),
                             initialize);
                 } catch (final ClassNotFoundException ex2) { // NOPMD
                     // ignore exception
                 }
             }
 
             throw ex;
         }
     }
 
     /**
      * Returns 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 ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final ClassLoader classLoader, final String className) throws ClassNotFoundException {
         return getClass(classLoader, className, true);
     }
 
     /**
      * Returns 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 ClassNotFoundException if the class is not found
      */
     public static Class<?> getClass(final String className) throws ClassNotFoundException {
         return getClass(className, true);
     }
 
     /**
      * Returns 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 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);
     }
 
     // Public method
     // ----------------------------------------------------------------------
     /**
      * <p>Returns 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="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4071957">4071957</a>).
      *
      *  <code><pre>Set set = Collections.unmodifiableSet(...);
      *  Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty",  new Class[0]);
      *  Object result = method.invoke(set, new Object[]);</pre></code>
      * </p>
      *
      * @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 metothod doen't conform with the requirements
      */
     public static Method getPublicMethod(final Class<?> cls, final String methodName, final Class<?>... parameterTypes)
             throws SecurityException, NoSuchMethodException {
 
         final Method declaredMethod = cls.getMethod(methodName, parameterTypes);
         if (Modifier.isPublic(declaredMethod.getDeclaringClass().getModifiers())) {
             return declaredMethod;
         }
 
         final List<Class<?>> candidateClasses = new ArrayList<Class<?>>();
         candidateClasses.addAll(getAllInterfaces(cls));
         candidateClasses.addAll(getAllSuperclasses(cls));
 
         for (final Class<?> candidateClass : candidateClasses) {
             if (!Modifier.isPublic(candidateClass.getModifiers())) {
                 continue;
             }
             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));
     }
 
     // ----------------------------------------------------------------------
     /**
      * Converts a class name to a JLS style class name.
      *
      * @param className  the class name
      * @return the converted name
      */
     private static String toCanonicalName(String className) {
         className = StringUtils.deleteWhitespace(className);
         if (className == null) {
             throw new NullPointerException("className must not be null.");
         } else if (className.endsWith("[]")) {
             final StringBuilder classNameBuffer = new StringBuilder();
             while (className.endsWith("[]")) {
                 className = className.substring(0, className.length() - 2);
                 classNameBuffer.append("[");
             }
             final String abbreviation = abbreviationMap.get(className);
             if (abbreviation != null) {
                 classNameBuffer.append(abbreviation);
             } else {
                 classNameBuffer.append("L").append(className).append(";");
             }
             className = classNameBuffer.toString();
         }
         return className;
     }
 
     /**
      * <p>Converts an array of {@code Object} in to an array of {@code Class} objects.
      * If any of these objects is null, a null element will be inserted into the array.</p>
      *
      * <p>This method returns {@code null} for a {@code null} input array.</p>
      *
      * @param array an {@code Object} array
      * @return a {@code Class} array, {@code null} if null array input
      * @since 2.4
      */
     public static Class<?>[] toClass(final Object... array) {
         if (array == null) {
             return null;
         } else if (array.length == 0) {
             return ArrayUtils.EMPTY_CLASS_ARRAY;
         }
         final Class<?>[] classes = new Class[array.length];
         for (int i = 0; i < array.length; i++) {
             classes[i] = array[i] == null ? null : array[i].getClass();
         }
         return classes;
     }
 
     // Short canonical name
     // ----------------------------------------------------------------------
     /**
      * <p>Gets the canonical name minus the package name for an {@code Object}.</p>
      *
      * @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
      */
     public static String getShortCanonicalName(final Object object, final String valueIfNull) {
         if (object == null) {
             return valueIfNull;
         }
         return getShortCanonicalName(object.getClass().getName());
     }
 
     /**
      * <p>Gets the canonical name minus the package name from a {@code Class}.</p>
      *
      * @param cls  the class to get the short name for.
      * @return the canonical name without the package name or an empty string
      * @since 2.4
      */
     public static String getShortCanonicalName(final Class<?> cls) {
         if (cls == null) {
             return StringUtils.EMPTY;
         }
         return getShortCanonicalName(cls.getName());
     }
 
     /**
      * <p>Gets the canonical name minus the package name from a String.</p>
      *
      * <p>The string passed in is assumed to be a canonical name - it is not checked.</p>
      *
      * @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 ClassUtils.getShortClassName(getCanonicalName(canonicalName));
     }
 
     // Package name
     // ----------------------------------------------------------------------
     /**
      * <p>Gets the package name from the canonical name of an {@code Object}.</p>
      *
      * @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());
     }
 
     /**
      * <p>Gets the package name from the canonical name of a {@code Class}.</p>
      *
      * @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());
     }
 
     /**
      * <p>Gets the package name from the canonical name. </p>
      *
      * <p>The string passed in is assumed to be a canonical name - it is not checked.</p>
      * <p>If the class is unpackaged, return an empty string.</p>
      *
      * @param canonicalName  the canonical 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 canonicalName) {
         return ClassUtils.getPackageName(getCanonicalName(canonicalName));
     }
 
     /**
      * <p>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>
      * <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 className the name of class
      * @return canonical form of class name
      * @since 2.4
      */
     private static String getCanonicalName(String className) {
         className = StringUtils.deleteWhitespace(className);
         if (className == null) {
             return null;
         } else {
             int dim = 0;
             while (className.startsWith("[")) {
                 dim++;
                 className = className.substring(1);
             }
             if (dim < 1) {
                 return className;
             } else {
                 if (className.startsWith("L")) {
                     className = className.substring(
                         1,
                         className.endsWith(";")
                             ? className.length() - 1
                             : className.length());
                 } else {
                     if (className.length() > 0) {
                         className = reverseAbbreviationMap.get(className.substring(0, 1));
                     }
                 }
                 final StringBuilder canonicalClassNameBuffer = new StringBuilder(className);
                 for (int i = 0; i < dim; i++) {
                     canonicalClassNameBuffer.append("[]");
                 }
                 return canonicalClassNameBuffer.toString();
             }
         }
     }
 
 }