/*
* ====================================================================
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.client.protocol;
import java.io.IOException;
import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.annotation.Immutable;
import org.apache.http.client.entity.DeflateDecompressingEntity;
import org.apache.http.client.entity.GzipDecompressingEntity;
import org.apache.http.protocol.HttpContext;
/**
* {@link HttpResponseInterceptor} responsible for processing Content-Encoding
* responses.
* <p>
* Instances of this class are stateless and immutable, therefore threadsafe.
*
* @since 4.1
*
*/
@Immutable
public class ResponseContentEncoding implements HttpResponseInterceptor {
/**
* Handles the following {@code Content-Encoding}s by
* using the appropriate decompressor to wrap the response Entity:
* <ul>
* <li>gzip - see {@link GzipDecompressingEntity}</li>
* <li>deflate - see {@link DeflateDecompressingEntity}</li>
* <li>identity - no action needed</li>
* </ul>
*
* @param response the response which contains the entity
* @param context not currently used
*
* @throws HttpException if the {@code Content-Encoding} is none of the above
*/
public void process(
final HttpResponse response,
final HttpContext context) throws HttpException, IOException {
HttpEntity entity = response.getEntity();
// It wasn't a 304 Not Modified response, 204 No Content or similar
if (entity != null) {
Header ceheader = entity.getContentEncoding();
if (ceheader != null) {
HeaderElement[] codecs = ceheader.getElements();
for (HeaderElement codec : codecs) {
if ("gzip".equalsIgnoreCase(codec.getName())) {
response.setEntity(new GzipDecompressingEntity(response.getEntity()));
return;
} else if ("deflate".equalsIgnoreCase(codec.getName())) {
response.setEntity(new DeflateDecompressingEntity(response.getEntity()));
return;
} else if ("identity".equalsIgnoreCase(codec.getName())) {
/* Don't need to transform the content - no-op */
return;
} else {
throw new HttpException("Unsupported Content-Coding: " + codec.getName());
}
}
}
}
}
}