content: /*
   * 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 com.alimama.mdrill.utils.zip;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /**
   * A fallback ZipEncoding, which uses a java.io means to encode names.
   *
   * <p>This implementation is not favorable for encodings other than
   * utf-8, because java.io encodes unmappable character as question
   * marks leading to unreadable ZIP entries on some operating
   * systems.</p>
   * 
   * <p>Furthermore this implementation is unable to tell whether a
   * given name can be safely encoded or not.</p>
   * 
   * <p>This implementation acts as a last resort implementation, when
   * neither {@link Simple8BitZipEnoding} nor {@link NioZipEncoding} is
   * available.</p>
   * 
   * <p>The methods of this class are reentrant.</p>
   */
  class FallbackZipEncoding implements ZipEncoding {
      private final String charset;
  
      /**
       * Construct a fallback zip encoding, which uses the platform's
       * default charset.
       */
      public FallbackZipEncoding() {
          this.charset = null;
      }
  
      /**
       * Construct a fallback zip encoding, which uses the given charset.
       * 
       * @param charset The name of the charset or {@code null} for
       *                the platform's default character set.
       */
      public FallbackZipEncoding(String charset) {
          this.charset = charset;
      }
  
      /**
       * @see
       * com.alimama.mdrill.utils.zip.ZipEncoding#canEncode(java.lang.String)
       */
      public boolean canEncode(String name) {
          return true;
      }
  
      /**
       * @see
       * com.alimama.mdrill.utils.zip.ZipEncoding#encode(java.lang.String)
       */
      public ByteBuffer encode(String name) throws IOException {
          if (this.charset == null) { // i.e. use default charset, see no-args constructor
              return ByteBuffer.wrap(name.getBytes());
          } else {
              return ByteBuffer.wrap(name.getBytes(this.charset));
          }
      }
  
      /**
       * @see
       * com.alimama.mdrill.utils.zip.ZipEncoding#decode(byte[])
       */
      public String decode(byte[] data) throws IOException {
          if (this.charset == null) { // i.e. use default charset, see no-args constructor
              return new String(data);
          } else {
              return new String(data,this.charset);
          }
      }
  }
  