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.GZIP; 25 26 import java.io.IOException; 27 import java.io.InputStream; 28 import java.util.zip.GZIPInputStream; 29 30 import org.apache.http.HttpEntity; 31 import org.apache.http.entity.HttpEntityWrapper; 32 33 /** 34 * Content encoding used to handle GZIP responses. 35 * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a> 36 */ 37 public class GZIPEncoding extends ContentEncoding { 38 39 /** 40 * Returns the {@link Type#GZIP} encoding string which is added to the 41 * <code>Accept</code> header by the base class. 42 */ 43 @Override 44 public String getContentEncoding() { 45 return GZIP.toString(); 46 } 47 48 /** 49 * Wraps the raw entity in a {@link GZIPDecompressingEntity}. 50 */ 51 @Override 52 public HttpEntity wrapResponseEntity( HttpEntity raw ) { 53 return new GZIPDecompressingEntity( raw ); 54 } 55 56 /** 57 * Entity used to interpret a GZIP-encoded response 58 * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a> 59 */ 60 protected static class GZIPDecompressingEntity extends HttpEntityWrapper { 61 62 public GZIPDecompressingEntity(final HttpEntity entity) { 63 super(entity); 64 } 65 66 /** 67 * returns a {@link GZIPInputStream} which wraps the original entity's 68 * content stream 69 * @see HttpEntity#getContent() 70 */ 71 @Override 72 public InputStream getContent() throws IOException, IllegalStateException { 73 return new GZIPInputStream( wrappedEntity.getContent() ); 74 } 75 76 /** 77 * @return -1 78 */ 79 @Override 80 public long getContentLength() { 81 // length of un-gzipped content is not known 82 return -1; 83 } 84 } 85 }