001 /* 002 * Copyright 2003-2008 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * You are receiving this code free of charge, which represents many hours of 017 * effort from other individuals and corporations. As a responsible member 018 * of the community, you are asked (but not required) to donate any 019 * enhancements or improvements back to the community under a similar open 020 * source license. Thank you. -TMN 021 */ 022 package groovyx.net.http; 023 024 import static groovyx.net.http.ContentEncoding.Type.GZIP; 025 026 import java.io.IOException; 027 import java.io.InputStream; 028 import java.util.zip.GZIPInputStream; 029 030 import org.apache.http.HttpEntity; 031 import org.apache.http.entity.HttpEntityWrapper; 032 033 /** 034 * Content encoding used to handle GZIP responses. 035 * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a> 036 */ 037 public class GZIPEncoding extends ContentEncoding { 038 039 /** 040 * Returns the {@link Type#GZIP} encoding string which is added to the 041 * <code>Accept</code> header by the base class. 042 */ 043 @Override 044 public String getContentEncoding() { 045 return GZIP.toString(); 046 } 047 048 /** 049 * Wraps the raw entity in a {@link GZIPDecompressingEntity}. 050 */ 051 @Override 052 public HttpEntity wrapResponseEntity( HttpEntity raw ) { 053 return new GZIPDecompressingEntity( raw ); 054 } 055 056 /** 057 * Entity used to interpret a GZIP-encoded response 058 * @author <a href='mailto:tnichols@enernoc.com'>Tom Nichols</a> 059 */ 060 protected static class GZIPDecompressingEntity extends HttpEntityWrapper { 061 062 public GZIPDecompressingEntity(final HttpEntity entity) { 063 super(entity); 064 } 065 066 /** 067 * returns a {@link GZIPInputStream} which wraps the original entity's 068 * content stream 069 * @see HttpEntity#getContent() 070 */ 071 @Override 072 public InputStream getContent() throws IOException, IllegalStateException { 073 return new GZIPInputStream( wrappedEntity.getContent() ); 074 } 075 076 /** 077 * @return -1 078 */ 079 @Override 080 public long getContentLength() { 081 // length of un-gzipped content is not known 082 return -1; 083 } 084 } 085 }