/*
* $HeadURL: https://svn.apache.org/repos/asf/jakarta/httpcomponents/httpcore/tags/4.0-alpha2/src/java/org/apache/http/protocol/ResponseContent.java $
* $Revision: 408172 $
* $Date: 2006-05-21 16:06:29 +0200 (Sun, 21 May 2006) $
*
* ====================================================================
*
* Copyright 1999-2006 The Apache Software Foundation
*
* Licensed 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.protocol;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolException;
/**
* A response interceptor that sets up entity-related headers.
* For use on the server side.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 408172 $
*
* @since 4.0
*/
public class ResponseContent implements HttpResponseInterceptor {
public ResponseContent() {
super();
}
public void process(final HttpResponse response, final HttpContext context)
throws HttpException, IOException {
if (response == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
if (response.containsHeader(HTTP.TRANSFER_ENCODING)) {
throw new ProtocolException("Transfer-encoding header already present");
}
if (response.containsHeader(HTTP.CONTENT_LEN)) {
throw new ProtocolException("Content-Length header already present");
}
HttpVersion ver = response.getStatusLine().getHttpVersion();
HttpEntity entity = response.getEntity();
if (entity != null) {
long len = entity.getContentLength();
if (entity.isChunked() && ver.greaterEquals(HttpVersion.HTTP_1_1)) {
response.addHeader(new GeneratedHeader(HTTP.TRANSFER_ENCODING,
HTTP.CHUNK_CODING));
} else if (len >= 0) {
response.addHeader(new GeneratedHeader(HTTP.CONTENT_LEN,
Long.toString(entity.getContentLength())));
}
// Specify a content type if known
if (entity.getContentType() != null) {
response.setHeader(entity.getContentType());
}
// Specify a content encoding if known
if (entity.getContentEncoding() != null) {
response.setHeader(entity.getContentEncoding());
}
} else {
int status = response.getStatusLine().getStatusCode();
if (status != HttpStatus.SC_NO_CONTENT
&& status != HttpStatus.SC_NOT_MODIFIED
&& status != HttpStatus.SC_RESET_CONTENT) {
response.addHeader(new GeneratedHeader(HTTP.CONTENT_LEN, "0"));
}
}
}
}