| /* |
| * 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. |
| */ |
| package org.apache.myfaces.view; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| |
| import javax.servlet.ServletOutputStream; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.http.HttpServletResponseWrapper; |
| |
| /** |
| * Implementation of a switching response wrapper to turn |
| * output on and off according to the JSF spec 2.0. |
| * <p> |
| * Implemented as HttpServletResponseWrapper, |
| * so that the switching does not interfere with methods that |
| * expect a HttpServletResponse when invoking ExternalContext.getResponse().</p> |
| */ |
| public class HttpServletResponseSwitch extends HttpServletResponseWrapper implements ResponseSwitch |
| { |
| private PrintWriter _switchableWriter; |
| private SwitchableOutputStream _switchableOutputStream; |
| private boolean _enabled = true; |
| |
| public HttpServletResponseSwitch(HttpServletResponse response) |
| { |
| super(response); |
| } |
| |
| /** |
| * Enables or disables the Response's Writer and OutputStream. |
| * @param enabled |
| */ |
| @Override |
| public void setEnabled(boolean enabled) |
| { |
| _enabled = enabled; |
| } |
| |
| /** |
| * Are the Response's Writer and OutputStream currently enabled? |
| * @return |
| */ |
| @Override |
| public boolean isEnabled() |
| { |
| return _enabled; |
| } |
| |
| |
| @Override |
| public int getBufferSize() |
| { |
| if (isEnabled()) |
| { |
| return super.getBufferSize(); |
| } |
| return 0; |
| } |
| |
| @Override |
| public boolean isCommitted() |
| { |
| if (isEnabled()) |
| { |
| return super.isCommitted(); |
| } |
| return false; |
| } |
| |
| @Override |
| public void reset() |
| { |
| if (isEnabled()) |
| { |
| super.reset(); |
| } |
| } |
| |
| @Override |
| public void resetBuffer() |
| { |
| if (isEnabled()) |
| { |
| super.resetBuffer(); |
| } |
| } |
| |
| @Override |
| public void flushBuffer() throws IOException |
| { |
| if (isEnabled()) |
| { |
| super.flushBuffer(); |
| } |
| } |
| |
| @Override |
| public void setResponse(ServletResponse response) |
| { |
| // only change the response if it is not the same object |
| if (response instanceof HttpServletResponse && response != getResponse()) |
| { |
| // our OutputStream and our Writer are not valid for the new response |
| _switchableOutputStream = null; |
| _switchableWriter = null; |
| |
| // set the new response |
| super.setResponse(response); |
| } |
| } |
| |
| @Override |
| public ServletOutputStream getOutputStream() throws IOException |
| { |
| if (_switchableOutputStream == null) |
| { |
| _switchableOutputStream = new SwitchableOutputStream(super.getOutputStream(), this); |
| } |
| return _switchableOutputStream; |
| } |
| |
| @Override |
| public PrintWriter getWriter() throws IOException |
| { |
| if (_switchableWriter == null) |
| { |
| _switchableWriter = new PrintWriter(new SwitchableWriter(super.getWriter(), this)); |
| } |
| return _switchableWriter; |
| } |
| |
| } |