gzipresponsewrapper.java

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/*
 * Copyright (c) 2003-2006, Simon Brown
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   - Neither the name of Pebble nor the names of its contributors may
 *     be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package net.sourceforge.pebble.web.filter;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

public class GZIPResponseWrapper extends HttpServletResponseWrapper {

  protected HttpServletResponse wrappedResponse = null;
  protected ServletOutputStream stream = null;
  protected PrintWriter writer = null;

  public GZIPResponseWrapper(HttpServletResponse response) {
    super(response);
    wrappedResponse = response;
  }

  public ServletOutputStream createOutputStream() throws IOException {
    return (new GZIPResponseStream(wrappedResponse));
  }

  public void finishResponse() {
    try {
      if (writer != null) {
        writer.close();
      } else {
        if (stream != null) {
          stream.close();
        }
      }
    } catch (IOException e) {
    }
  }

  public void flushBuffer() throws IOException {
    stream.flush();
  }

  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) {
  }

}