content: /*
   * Conditions Of Use
   *
   * This software was developed by employees of the National Institute of
   * Standards and Technology (NIST), an agency of the Federal Government.
   * Pursuant to title 15 Untied States Code Section 105, works of NIST
   * employees are not subject to copyright protection in the United States
   * and are considered to be in the public domain.  As a result, a formal
   * license is not needed to use the software.
   *
   * This software is provided by NIST as a service and is expressly
   * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
   * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
   * AND DATA ACCURACY.  NIST does not warrant or make any representations
   * regarding the use of the software or the results thereof, including but
   * not limited to the correctness, accuracy, reliability or usefulness of
   * the software.
   *
   * Permission to use this software is contingent upon your acceptance
   * of the terms of this agreement
   *
   * .
   *
   */
  package gov2.nist.javax2.sip.parser;
  
  import gov2.nist.core.InternalErrorHandler;
  import gov2.nist.javax2.sip.stack.SIPStackTimerTask;
  
  import java.io.*;
  import java.util.*;
  
  /**
   * Input class for the pipelined parser. Buffer all bytes read from the socket
   * and make them available to the message parser.
   *
   * @author M. Ranganathan (Contains a bug fix contributed by Rob Daugherty (
   *         Lucent Technologies) )
   *
   */
  
  public class Pipeline extends InputStream {
      private LinkedList buffList;
  
      private Buffer currentBuffer;
  
      private boolean isClosed;
  
      private Timer timer;
  
      private InputStream pipe;
  
      private int readTimeout;
  
      private TimerTask myTimerTask;
  
      class MyTimer extends SIPStackTimerTask {
          Pipeline pipeline;
  
          private boolean isCancelled;
  
          protected MyTimer(Pipeline pipeline) {
              this.pipeline = pipeline;
          }
  
          protected void runTask() {
              if (this.isCancelled)
                  return;
  
              try {
                  pipeline.close();
              } catch (IOException ex) {
                  InternalErrorHandler.handleException(ex);
              }
          }
  
          public boolean cancel() {
              boolean retval = super.cancel();
              this.isCancelled = true;
              return retval;
          }
  
      }
  
      class Buffer {
          byte[] bytes;
  
          int length;
  
          int ptr;
  
          public Buffer(byte[] bytes, int length) {
              ptr = 0;
              this.length = length;
              this.bytes = bytes;
          }
  
          public int getNextByte() {
              int retval = bytes[ptr++] & 0xFF;
              return retval;
          }
  
      }
  
      public void startTimer() {
          if (this.readTimeout == -1)
              return;
          // TODO make this a tunable number. For now 4 seconds
          // between reads seems reasonable upper limit.
          this.myTimerTask = new MyTimer(this);
          this.timer.schedule(this.myTimerTask, this.readTimeout);
      }
  
      public void stopTimer() {
          if (this.readTimeout == -1)
              return;
          if (this.myTimerTask != null)
              this.myTimerTask.cancel();
      }
  
      public Pipeline(InputStream pipe, int readTimeout, Timer timer) {
          // pipe is the Socket stream
          // this is recorded here to implement a timeout.
          this.timer = timer;
          this.pipe = pipe;
          buffList = new LinkedList();
          this.readTimeout = readTimeout;
      }
  
      public void write(byte[] bytes, int start, int length) throws IOException {
          if (this.isClosed)
              throw new IOException("Closed!!");
          Buffer buff = new Buffer(bytes, length);
          buff.ptr = start;
          synchronized (this.buffList) {
              buffList.add(buff);
              buffList.notifyAll();
          }
      }
  
      public void write(byte[] bytes) throws IOException {
          if (this.isClosed)
              throw new IOException("Closed!!");
          Buffer buff = new Buffer(bytes, bytes.length);
          synchronized (this.buffList) {
              buffList.add(buff);
              buffList.notifyAll();
          }
      }
  
      public void close() throws IOException {
          this.isClosed = true;
          synchronized (this.buffList) {
              this.buffList.notifyAll();
          }
  
          // JvB: added
          this.pipe.close();
      }
  
      public int read() throws IOException {
          // if (this.isClosed) return -1;
          synchronized (this.buffList) {
              if (currentBuffer != null
                      && currentBuffer.ptr < currentBuffer.length) {
                  int retval = currentBuffer.getNextByte();
                  if (currentBuffer.ptr == currentBuffer.length)
                      this.currentBuffer = null;
                  return retval;
              }
              // Bug fix contributed by Rob Daugherty.
              if (this.isClosed && this.buffList.isEmpty())
                  return -1;
              try {
                  // wait till something is posted.
                  while (this.buffList.isEmpty()) {
                      this.buffList.wait();
                      if (this.isClosed)
                          return -1;
                  }
                  currentBuffer = (Buffer) this.buffList.removeFirst();
                  int retval = currentBuffer.getNextByte();
                  if (currentBuffer.ptr == currentBuffer.length)
                      this.currentBuffer = null;
                  return retval;
              } catch (InterruptedException ex) {
                  throw new IOException(ex.getMessage());
              } catch (NoSuchElementException ex) {
                  ex.printStackTrace();
                  throw new IOException(ex.getMessage());
              }
          }
      }
  
  }
  