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      1 /*
      2  * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/entity/EntitySerializer.java $
      3  * $Revision: 560343 $
      4  * $Date: 2007-07-27 11:18:19 -0700 (Fri, 27 Jul 2007) $
      5  *
      6  * ====================================================================
      7  * Licensed to the Apache Software Foundation (ASF) under one
      8  * or more contributor license agreements.  See the NOTICE file
      9  * distributed with this work for additional information
     10  * regarding copyright ownership.  The ASF licenses this file
     11  * to you under the Apache License, Version 2.0 (the
     12  * "License"); you may not use this file except in compliance
     13  * with the License.  You may obtain a copy of the License at
     14  *
     15  *   http://www.apache.org/licenses/LICENSE-2.0
     16  *
     17  * Unless required by applicable law or agreed to in writing,
     18  * software distributed under the License is distributed on an
     19  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     20  * KIND, either express or implied.  See the License for the
     21  * specific language governing permissions and limitations
     22  * under the License.
     23  * ====================================================================
     24  *
     25  * This software consists of voluntary contributions made by many
     26  * individuals on behalf of the Apache Software Foundation.  For more
     27  * information on the Apache Software Foundation, please see
     28  * <http://www.apache.org/>.
     29  *
     30  */
     31 
     32 package org.apache.http.impl.entity;
     33 
     34 import java.io.IOException;
     35 import java.io.OutputStream;
     36 
     37 import org.apache.http.HttpEntity;
     38 import org.apache.http.HttpException;
     39 import org.apache.http.HttpMessage;
     40 import org.apache.http.entity.ContentLengthStrategy;
     41 import org.apache.http.impl.io.ChunkedOutputStream;
     42 import org.apache.http.impl.io.ContentLengthOutputStream;
     43 import org.apache.http.impl.io.IdentityOutputStream;
     44 import org.apache.http.io.SessionOutputBuffer;
     45 
     46 /**
     47  * Default implementation of an entity serializer.
     48  * <p>
     49  * This entity serializer currently supports only "chunked" and "identitiy" transfer-coding</a>
     50  * </p>
     51  *
     52  * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
     53  *
     54  * @version $Revision: 560343 $
     55  *
     56  * @since 4.0
     57  */
     58 public class EntitySerializer {
     59 
     60     private final ContentLengthStrategy lenStrategy;
     61 
     62     public EntitySerializer(final ContentLengthStrategy lenStrategy) {
     63         super();
     64         if (lenStrategy == null) {
     65             throw new IllegalArgumentException("Content length strategy may not be null");
     66         }
     67         this.lenStrategy = lenStrategy;
     68     }
     69 
     70     protected OutputStream doSerialize(
     71             final SessionOutputBuffer outbuffer,
     72             final HttpMessage message) throws HttpException, IOException {
     73         long len = this.lenStrategy.determineLength(message);
     74         if (len == ContentLengthStrategy.CHUNKED) {
     75             return new ChunkedOutputStream(outbuffer);
     76         } else if (len == ContentLengthStrategy.IDENTITY) {
     77             return new IdentityOutputStream(outbuffer);
     78         } else {
     79             return new ContentLengthOutputStream(outbuffer, len);
     80         }
     81     }
     82 
     83     public void serialize(
     84             final SessionOutputBuffer outbuffer,
     85             final HttpMessage message,
     86             final HttpEntity entity) throws HttpException, IOException {
     87         if (outbuffer == null) {
     88             throw new IllegalArgumentException("Session output buffer may not be null");
     89         }
     90         if (message == null) {
     91             throw new IllegalArgumentException("HTTP message may not be null");
     92         }
     93         if (entity == null) {
     94             throw new IllegalArgumentException("HTTP entity may not be null");
     95         }
     96         OutputStream outstream = doSerialize(outbuffer, message);
     97         entity.writeTo(outstream);
     98         outstream.close();
     99     }
    100 
    101 }
    102