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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/EntityDeserializer.java $
      3  * $Revision: 560358 $
      4  * $Date: 2007-07-27 12:30:42 -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 
     36 import org.apache.http.Header;
     37 import org.apache.http.HttpEntity;
     38 import org.apache.http.HttpException;
     39 import org.apache.http.HttpMessage;
     40 import org.apache.http.entity.BasicHttpEntity;
     41 import org.apache.http.entity.ContentLengthStrategy;
     42 import org.apache.http.impl.io.ChunkedInputStream;
     43 import org.apache.http.impl.io.ContentLengthInputStream;
     44 import org.apache.http.impl.io.IdentityInputStream;
     45 import org.apache.http.io.SessionInputBuffer;
     46 import org.apache.http.protocol.HTTP;
     47 
     48 /**
     49  * Default implementation of an entity deserializer.
     50  * <p>
     51  * This entity deserializer currently supports only "chunked" and "identitiy" transfer-coding</a>
     52  * </p>
     53  *
     54  * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
     55  *
     56  * @version $Revision: 560358 $
     57  *
     58  * @since 4.0
     59  */
     60 public class EntityDeserializer {
     61 
     62     private final ContentLengthStrategy lenStrategy;
     63 
     64     public EntityDeserializer(final ContentLengthStrategy lenStrategy) {
     65         super();
     66         if (lenStrategy == null) {
     67             throw new IllegalArgumentException("Content length strategy may not be null");
     68         }
     69         this.lenStrategy = lenStrategy;
     70     }
     71 
     72     protected BasicHttpEntity doDeserialize(
     73             final SessionInputBuffer inbuffer,
     74             final HttpMessage message) throws HttpException, IOException {
     75         BasicHttpEntity entity = new BasicHttpEntity();
     76 
     77         long len = this.lenStrategy.determineLength(message);
     78         if (len == ContentLengthStrategy.CHUNKED) {
     79             entity.setChunked(true);
     80             entity.setContentLength(-1);
     81             entity.setContent(new ChunkedInputStream(inbuffer));
     82         } else if (len == ContentLengthStrategy.IDENTITY) {
     83             entity.setChunked(false);
     84             entity.setContentLength(-1);
     85             entity.setContent(new IdentityInputStream(inbuffer));
     86         } else {
     87             entity.setChunked(false);
     88             entity.setContentLength(len);
     89             entity.setContent(new ContentLengthInputStream(inbuffer, len));
     90         }
     91 
     92         Header contentTypeHeader = message.getFirstHeader(HTTP.CONTENT_TYPE);
     93         if (contentTypeHeader != null) {
     94             entity.setContentType(contentTypeHeader);
     95         }
     96         Header contentEncodingHeader = message.getFirstHeader(HTTP.CONTENT_ENCODING);
     97         if (contentEncodingHeader != null) {
     98             entity.setContentEncoding(contentEncodingHeader);
     99         }
    100         return entity;
    101     }
    102 
    103     public HttpEntity deserialize(
    104             final SessionInputBuffer inbuffer,
    105             final HttpMessage message) throws HttpException, IOException {
    106         if (inbuffer == null) {
    107             throw new IllegalArgumentException("Session input buffer may not be null");
    108         }
    109         if (message == null) {
    110             throw new IllegalArgumentException("HTTP message may not be null");
    111         }
    112         return doDeserialize(inbuffer, message);
    113     }
    114 
    115 }
    116