/*
* Copyright 2008-2014 by Emeric Vernat
*
* This file is part of Java Melody.
*
* 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 net.bull.javamelody;
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;
/**
* Implémentation de HttpServletResponseWrapper permettant d'encapsuler l'outputStream,
* par exemple pour calculer la taille du flux ou pour le compresser.
* @author Emeric Vernat
*/
abstract class FilterServletResponseWrapper extends HttpServletResponseWrapper {
private ServletOutputStream stream;
private PrintWriter writer;
private int status;
/**
* Constructeur.
* @param response HttpServletResponse
*/
FilterServletResponseWrapper(HttpServletResponse response) {
super(response);
assert response != null;
}
/**
* @return ServletOutputStream
*/
ServletOutputStream getStream() {
return stream;
}
/** {@inheritDoc} */
@Override
public void reset() {
super.reset();
status = 0;
stream = null;
writer = null;
}
/**
* Retourne le status définit par setStatus ou sendError.
* @return int
*/
public int getCurrentStatus() {
// cette méthode s'appele getCurrentStatus pour ne pas interférer avec getStatus
// dans servlet api 3.0, tout en restant compatible avec servlet api 2.5
return status;
}
/** {@inheritDoc} */
@Override
public void setStatus(int status) {
super.setStatus(status);
this.status = status;
}
/** {@inheritDoc} */
@Override
public void sendError(int error) throws IOException {
super.sendError(error);
this.status = error;
}
/** {@inheritDoc} */
@Override
public void sendError(int error, String message) throws IOException {
super.sendError(error, message);
this.status = error;
}
/**
* Crée et retourne un ServletOutputStream pour écrire le contenu dans la response associée.
* @return ServletOutputStream
* @throws IOException Erreur d'entrée/sortie
*/
protected abstract ServletOutputStream createOutputStream() throws IOException;
/** {@inheritDoc} */
@Override
public ServletOutputStream getOutputStream() throws IOException {
if (writer != null) {
throw new IllegalStateException("getWriter() has already been called for this response");
}
if (stream == null) {
stream = createOutputStream();
assert stream != null;
}
return stream;
}
/** {@inheritDoc} */
@Override
public PrintWriter getWriter() throws IOException {
if (writer == null) {
if (stream != null) {
throw new IllegalStateException(
"getOutputStream() has already been called for this response");
}
final ServletOutputStream outputStream = getOutputStream();
final String charEnc = getResponse().getCharacterEncoding();
// HttpServletResponse.getCharacterEncoding() shouldn't return null
// according the spec, so feel free to remove that "if"
PrintWriter result;
if (charEnc == null) {
result = new PrintWriter(outputStream);
} else {
result = new PrintWriter(new OutputStreamWriter(outputStream, charEnc));
}
writer = result;
}
return writer;
}
/** {@inheritDoc} */
@Override
public void flushBuffer() throws IOException {
if (writer != null) {
writer.flush();
} else if (stream != null) {
stream.flush();
}
}
/**
* Ferme le flux.
* @throws IOException e
*/
void close() throws IOException {
if (writer != null) {
writer.close();
} else if (stream != null) {
stream.close();
}
}
}