inputstream.java

ALGAE是一个快速创建算法演示的框架。目前支持的算法实现语言包括java和c

package edu.odu.cs.zeil.AlgAE.Server;

import java.io.IOException;

import edu.odu.cs.zeil.AlgAE.Server.MessageHandler;


public class InputStream extends java.io.InputStream
{
  private String buffer;
  private int pos;
  private int buflen;
  private MessageHandler msgs;
  
  public InputStream(MessageHandler handler)
  {
    buflen = 0;
    pos = 0;
    msgs = handler;
  }
  
    /**
     * Reads the next byte of data from this input stream. The value 
     * byte is returned as an <code>int</code> in the range 
     * <code>0</code> to <code>255</code>. If no byte is available 
     * because the end of the stream has been reached, the value 
     * <code>-1</code> is returned. This method blocks until input data 
     * is available, the end of the stream is detected, or an exception 
     * is thrown. 
     *
     * @return     the next byte of data, or <code>-1</code> if the end of the
     *             stream is reached.
     * @exception  IOException  if an I/O error occurs.
     */
  public int read() throws java.io.IOException
  {
    while (pos >= buflen)
      {
	buffer = msgs.stdInput ();
	buflen = buffer.length();
	pos = 0;
      }
    int ch = buffer.charAt(pos);
    ++pos;
    return ch;
  }


    /**
     * Returns the number of bytes that can be read from this input 
     * stream without blocking. 
     * @return     the number of bytes that can be read from this input stream
     *             without blocking.
     * @exception  IOException  if an I/O error occurs.
     */
    public int available() throws IOException {
	return buflen - pos;
    }

    /**
     * Closes this input stream and releases any system resources 
     * associated with the stream. 
     *
     * @exception  IOException  if an I/O error occurs.
     */
    public void close() throws IOException
    { buffer = null; }

}