001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.encoders;
018
019import java.io.*;
020
021/**
022 * Encoder for handling <js>"identity"</js> encoding and decoding.
023 *
024 * <p>
025 * Identity encoding is just another name for no encoding at all.
026 *
027 * <h5 class='section'>Notes:</h5><ul>
028 *    <li class='note'>This class is thread safe and reusable.
029 * </ul>
030 *
031 * <h5 class='section'>See Also:</h5><ul>
032 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/RestServerEncoders">Encoders</a>
033
034 * </ul>
035 */
036public class IdentityEncoder extends Encoder {
037
038   /** Singleton */
039   public static final IdentityEncoder INSTANCE = new IdentityEncoder();
040
041   /** Constructor. */
042   public IdentityEncoder() {}
043
044   @Override /* Encoder */
045   public InputStream getInputStream(InputStream is) throws IOException {
046      return is;
047   }
048
049   @Override /* Encoder */
050   public OutputStream getOutputStream(OutputStream os) throws IOException {
051      return os;
052   }
053
054   /**
055    * Returns <code>[<js>"identity"</js>]</code>.
056    */
057   @Override /* Encoder */
058   public String[] getCodings() {
059      return new String[]{"identity"};
060   }
061}