/*
    * 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.vfs2;
  
  import java.io.IOException;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.commons.lang3.ArrayUtils;
  import org.apache.commons.vfs2.util.Messages;
  
  /**
   * Thrown for file system errors.
   */
  public class FileSystemException extends IOException {
  
      /**
       * serialVersionUID format is YYYYMMDD for the date of the last binary change.
       */
      private static final long serialVersionUID = 20101208L;
  
      /** URL pattern */
      private static final Pattern URL_PATTERN = Pattern.compile("[a-z]+://.*");
  
      /** Password pattern */
      private static final Pattern PASSWORD_PATTERN = Pattern.compile(":(?:[^/]+)@");
  
      /**
       * Throws a FileSystemException when the given object is null.
       *
       * @param obj
       *            the object reference to check for null.
       * @param code
       *            message used when {@code
       *                FileSystemException} is thrown
       * @param <T>
       *            the type of the reference
       * @return {@code obj} if not {@code null}
       * @throws FileSystemException
       *             if {@code obj} is {@code null}
       * @since 2.3
       */
      public static <T> T requireNonNull(final T obj, final String code) throws FileSystemException {
          if (obj == null) {
              throw new FileSystemException(code);
          }
          return obj;
      }
  
      /**
       * Throws a FileSystemException when the given object is null.
       *
       * @param obj
       *            the object reference to check for null.
       * @param code
       *            message used when {@code
       *                FileSystemException} is thrown
       * @param info
       *            one context information.
       * @param <T>
       *            the type of the reference
       * @return {@code obj} if not {@code null}
       * @throws FileSystemException
       *             if {@code obj} is {@code null}
       * @since 2.3
       */
      public static <T> T requireNonNull(final T obj, final String code, final Object... info) throws FileSystemException {
          if (obj == null) {
              throw new FileSystemException(code, info);
          }
          return obj;
      }
  
      /**
       * Array of complementary info (context).
       */
      private final String[] info;
  
      /**
       * Constructs exception with the specified detail message.
       *
       * @param code the error code of the message.
       */
      public FileSystemException(final String code) {
          this(code, null, (Object[]) null);
     }
 
     /**
      * Constructs exception with the specified detail message.
      *
      * @param code the error code of the message.
      * @param info one context information.
      */
     public FileSystemException(final String code, final Object info) {
         this(code, null, new Object[] {info});
     }
 
     /**
      * Constructs exception with the specified detail message.
      *
      * @param code the error code of the message.
      * @param info array of complementary info (context).
      */
     public FileSystemException(final String code, final Object... info) {
         this(code, null, info);
     }
 
     /**
      * Constructs exception with the specified detail message and cause.
      *
      * @param code the error code of the message.
      * @param info one context information.
      * @param cause the cause.
      */
     public FileSystemException(final String code, final Object info, final Throwable cause) {
         this(code, cause, info);
     }
 
     /**
      * Constructs exception with the specified detail message.
      *
      * @param code the error code of the message.
      * @param info array of complementary info (context).
      * @param cause the cause.
      * @deprecated Use instead {@link #FileSystemException(String, Throwable, Object[])}. Will be removed in 3.0.
      */
     @Deprecated
     public FileSystemException(final String code, final Object[] info, final Throwable cause) {
         this(code, cause, info);
     }
 
     /**
      * Constructs exception with the specified detail message.
      *
      * @param code the error code of the message.
      * @param cause the original cause
      */
     public FileSystemException(final String code, final Throwable cause) {
         this(code, cause, (Object[]) null);
     }
 
     /**
      * Constructs exception with the specified detail message.
      *
      * @param code the error code of the message.
      * @param info array of complementary info (context).
      * @param cause the cause.
      */
     public FileSystemException(final String code, final Throwable cause, final Object... info) {
         super(code, cause);
 
         if (info == null) {
             this.info = ArrayUtils.EMPTY_STRING_ARRAY;
         } else {
             this.info = new String[info.length];
             for (int i = 0; i < info.length; i++) {
                 String value = String.valueOf(info[i]);
                 // mask passwords (VFS-169)
                 final Matcher urlMatcher = URL_PATTERN.matcher(value);
                 if (urlMatcher.find()) {
                     value = PASSWORD_PATTERN.matcher(value).replaceFirst(":***@");
                 }
                 this.info[i] = value;
             }
         }
     }
 
     /**
      * Constructs wrapper exception.
      *
      * @param cause the root cause to wrap.
      */
     public FileSystemException(final Throwable cause) {
         this(cause.getMessage(), cause, (Object[]) null);
     }
 
     /**
      * Retrieves error code of the exception. Could be used as key for internationalization.
      *
      * @return the code.
      */
     public String getCode() {
         return super.getMessage();
     }
 
     /**
      * Retrieves array of complementary info (context). Could be used as parameter for internationalization.
      *
      * @return the context info.
      */
     public String[] getInfo() {
         return info;
     }
 
     /**
      * Retrieves message from bundle.
      *
      * @return The exception message.
      */
     @Override
     public String getMessage() {
         return Messages.getString(super.getMessage(), (Object[]) getInfo());
     }
 }