gzipresponsestream.java

### File Source: gzipresponsestream.java

             /*
        P/P   *  Method: net.sourceforge.pebble.web.filter.GZIPResponseStream__static_init
              */
         1  /*
         2   * Copyright (c) 2003-2006, Simon Brown
         3   * All rights reserved.
         4   *
         5   * Redistribution and use in source and binary forms, with or without
         6   * modification, are permitted provided that the following conditions are met:
         7   *
         8   *   - Redistributions of source code must retain the above copyright
         9   *     notice, this list of conditions and the following disclaimer.
        10   *
        11   *   - Redistributions in binary form must reproduce the above copyright
        12   *     notice, this list of conditions and the following disclaimer in
        13   *     the documentation and/or other materials provided with the
        14   *     distribution.
        15   *
        16   *   - Neither the name of Pebble nor the names of its contributors may
        17   *     be used to endorse or promote products derived from this software
        18   *     without specific prior written permission.
        19   *
        20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
        21   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        23   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
        24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        30   * POSSIBILITY OF SUCH DAMAGE.
        31   */
        32  package net.sourceforge.pebble.web.filter;
        33
        34  import java.io.*;
        35  import java.util.zip.GZIPOutputStream;
        36  import javax.servlet.*;
        37  import javax.servlet.http.*;
        38
        39  public class GZIPResponseStream extends ServletOutputStream {
        40
        41    protected ByteArrayOutputStream baos = null;
        42    protected GZIPOutputStream gzipstream = null;
        43    protected boolean closed = false;
        44    protected HttpServletResponse response = null;
        45    protected ServletOutputStream output = null;
        46
               /*
        P/P     *  Method: void net.sourceforge.pebble.web.filter.GZIPResponseStream(HttpServletResponse)
                *
                *  Preconditions:
                *    response != null
                *
                *  Postconditions:
                *    this.baos == &new ByteArrayOutputStream(GZIPResponseStream#1)
                *    this.closed == 0
                *    this.gzipstream == &new GZIPOutputStream(GZIPResponseStream#2)
                *    init'ed(this.output)
                *    this.response == response
                *    this.response != null
                *    new ByteArrayOutputStream(GZIPResponseStream#1) num objects == 1
                *    new GZIPOutputStream(GZIPResponseStream#2) num objects == 1
                */
        47    public GZIPResponseStream(HttpServletResponse response) throws IOException {
        48      closed = false;
        49      this.response = response;
        50      this.output = response.getOutputStream();
        51      baos = new ByteArrayOutputStream();
        52      gzipstream = new GZIPOutputStream(baos);
        53    }
        54
        55    public void close() throws IOException {
        56      if (closed) {
        57        throw new IOException("This output stream has already been closed");
        58      }
        59      gzipstream.finish();
        60      gzipstream.flush();
        61      gzipstream.close();
        62
        63      byte[] bytes = baos.toByteArray();
        64      response.setContentLength(bytes.length);
        65      response.addHeader("Content-Encoding", "gzip");
        66      output.write(bytes);
        67      output.flush();
        68      output.close();
        69      closed = true;
        70    }
        71
               /*
        P/P     *  Method: void flush()
                *
                *  Preconditions:
                *    this.closed == 0
                *    this.gzipstream != null
                */
        72    public void flush() throws IOException {
        73      if (closed) {
        74        throw new IOException("Cannot flush a closed output stream");
        75      }
        76      gzipstream.flush();
        77    }
        78
               /*
        P/P     *  Method: void write(int)
                *
                *  Preconditions:
                *    this.closed == 0
                *    this.gzipstream != null
                */
        79    public void write(int b) throws IOException {
        80      if (closed) {
        81        throw new IOException("Cannot write to a closed output stream");
        82      }
        83      gzipstream.write((byte) b);
        84    }
        85
               /*
        P/P     *  Method: void write(byte[])
                *
                *  Preconditions:
                *    b != null
                *    b.length <= 232-1
                *    this.closed == 0
                *    this.gzipstream != null
                */
        86    public void write(byte b[]) throws IOException {
        87      write(b, 0, b.length);
        88    }
        89
               /*
        P/P     *  Method: void write(byte[], int, int)
                *
                *  Preconditions:
                *    this.closed == 0
                *    this.gzipstream != null
                */
        90    public void write(byte b[], int off, int len) throws IOException {
        91      if (closed) {
        92        throw new IOException("Cannot write to a closed output stream");
        93      }
        94      gzipstream.write(b, off, len);
        95    }
        96
               /*
        P/P     *  Method: bool closed()
                *
                *  Preconditions:
                *    init'ed(this.closed)
                *
                *  Postconditions:
                *    return_value == this.closed
                *    init'ed(return_value)
                */
        97    public boolean closed() {
        98      return (this.closed);
        99    }
       100
               /*
        P/P     *  Method: void reset()
                */
       101    public void reset() {
       102    }
       103
       104  }

SofCheck Inspector Build Version : 2.22510

gzipresponsestream.java | 2010-Jun-25 19:40:32
gzipresponsestream.class | 2010-Jul-19 20:23:38