/*
* Copyright 2002-2007 the original author or authors.
*
* 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.
*/
package org.internna.iwebmvc.performance;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* A servlet filter that compresses the response contents.
*
* @author Jayson Falkner [http://www.jspbook.com/]
* @author Jose Noheda
*
*/
public class GZIPResponseWrapper extends HttpServletResponseWrapper {
private static Log log = LogFactory.getLog(GZIPResponseWrapper.class);
protected HttpServletResponse origResponse = null;
protected ServletOutputStream stream = null;
protected PrintWriter writer = null;
protected int error = -1000;
public GZIPResponseWrapper(HttpServletResponse response) {
super(response);
origResponse = response;
}
public ServletOutputStream createOutputStream() throws IOException {
return (new GZIPResponseStream(origResponse));
}
public void finishResponse() {
try {
if (writer != null) writer.close();
else if (stream != null) stream.close();
} catch (IOException e) {
if (log.isWarnEnabled()) log.warn("Could not close GZIP response wrapper", e);
}
}
@Override
public void flushBuffer() throws IOException {
stream.flush();
}
@Override
public ServletOutputStream getOutputStream() throws IOException {
if (writer != null) throw new IllegalStateException("getWriter() has already been called!");
if (stream == null) stream = createOutputStream();
return stream;
}
@Override
public PrintWriter getWriter() throws IOException {
if (this.error == HttpServletResponse.SC_FORBIDDEN) return super.getWriter();
if (writer == null) {
if (stream != null) throw new IllegalStateException("getOutputStream() has already been called!");
stream = createOutputStream();
writer = new PrintWriter(new OutputStreamWriter(stream, origResponse.getCharacterEncoding()));
}
return writer;
}
@Override
public void setContentLength(int length) {
return;
}
@Override
public void sendError(int error, String message) throws IOException {
super.sendError(error, message);
this.error = error;
}
}