GZIPResponseWrapper.java

/*
 * Copyright 2013 cruxframework.org.
 * 
 * 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.cruxframework.crux.core.server.http;

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;

/**
 * @author Thiago da Rosa de Bustamante
 *
 */
public class GZIPResponseWrapper extends HttpServletResponseWrapper 
{
	protected HttpServletResponse origResponse = null;
	protected ServletOutputStream stream = null;
	protected PrintWriter writer = null;

	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) 
		{
			//
		}
	}

	public void flushBuffer() throws IOException 
	{
		if (stream != null)
		{
			stream.flush();
		}
		else if (origResponse != null)
		{
			origResponse.flushBuffer();
		}
	}

	public ServletOutputStream getOutputStream() throws IOException 
	{
		if (writer != null) 
		{
			throw new IllegalStateException("getWriter() has already been called!");
		}

		if (stream == null)
		{
			stream = createOutputStream();
		}
		return (stream);
	}

	public PrintWriter getWriter() throws IOException 
	{
		if (writer != null) 
		{
			return (writer);
		}

		if (stream != null) 
		{
			throw new IllegalStateException("getOutputStream() has already been called!");
		}

		stream = createOutputStream();
		writer = new PrintWriter(new OutputStreamWriter(stream, "UTF-8"));
		return (writer);
	}

	public void setContentLength(int length) {}
}