View Javadoc

1   /*
2    * Copyright 2003-2008 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   *
16   * You are receiving this code free of charge, which represents many hours of
17   * effort from other individuals and corporations.  As a responsible member 
18   * of the community, you are asked (but not required) to donate any 
19   * enhancements or improvements back to the community under a similar open 
20   * source license.  Thank you. -TMN
21   */
22  package groovyx.net.http;
23  
24  import static groovyx.net.http.ContentEncoding.Type.DEFLATE;
25  
26  import java.io.IOException;
27  import java.io.InputStream;
28  import java.util.zip.InflaterInputStream;
29  
30  import org.apache.http.HttpEntity;
31  import org.apache.http.entity.HttpEntityWrapper;
32  
33  /**
34   * Content encoding used to handle Deflate responses.
35   * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a>
36   */
37  public class DeflateEncoding extends ContentEncoding {
38  	
39  	@Override
40  	public String getContentEncoding() {
41  		return DEFLATE.toString();
42  	}
43  	
44  	
45  	/**
46  	 * Wraps the raw entity in a {@link InflaterEntity}.
47  	 */
48  	@Override
49  	public HttpEntity wrapResponseEntity( HttpEntity raw ) {
50  		return new InflaterEntity( raw );
51  	}
52  
53  	/**
54  	 * Entity used to interpret a Deflate-encoded response
55  	 * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a>
56  	 */
57      public static class InflaterEntity extends HttpEntityWrapper {
58  
59          public InflaterEntity(final HttpEntity entity) {
60              super(entity);
61          }
62      
63          /**
64           * returns a {@link InflaterInputStream} which wraps the original entity's
65           * content stream
66           * @see HttpEntity#getContent()
67           */
68          @Override
69          public InputStream getContent() throws IOException, IllegalStateException {
70              return new InflaterInputStream( wrappedEntity.getContent() );
71          }
72  
73          /**
74           * @return -1
75           */
76          @Override
77          public long getContentLength() {
78              // length of ungzipped content is not known
79              return -1;
80          }
81      }
82  
83  }