HessianDebugInputStream.java

/*
 * Copyright (c) 2001-2008 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 CAUCHO TECHNOLOGY OR ITS 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.
 *
 * @author Scott Ferguson
 */

package com.caucho.hessian4.io;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Debugging input stream for Hessian requests.
 */
public class HessianDebugInputStream extends InputStream
{
  private InputStream _is;
  
  private HessianDebugState _state;
  
  /**
   * Creates an uninitialized Hessian input stream.
   */
  public HessianDebugInputStream(InputStream is, OutputStream os)
  {
    this(is, new PrintWriter(os));
  }
  
  /**
   * Creates an uninitialized Hessian input stream.
   */
  public HessianDebugInputStream(InputStream is, PrintWriter dbg)
  {
    _is = is;

    if (dbg == null)
      dbg = new PrintWriter(System.out);

    _state = new HessianDebugState(dbg);
  }
  
  /**
   * Creates an uninitialized Hessian input stream.
   */
  public HessianDebugInputStream(InputStream is, Logger log, Level level)
  {
    this(is, new PrintWriter(new LogWriter(log, level)));
  }

  public void startTop2()
  {
    _state.startTop2();
  }

  public void startData1()
  {
    _state.startData1();
  }
  
  public void startStreaming()
  {
    _state.startStreaming();
  }

  public void setDepth(int depth)
  {
    _state.setDepth(depth);
  }

  /**
   * Reads a character.
   */
  public int read()
    throws IOException
  {
    int ch;

    InputStream is = _is;

    if (is == null)
      return -1;
    else {
      ch = is.read();
    }

    _state.next(ch);

    return ch;
  }

  /**
   * closes the stream.
   */
  public void close()
    throws IOException
  {
    InputStream is = _is;
    _is = null;

    if (is != null)
      is.close();
    
    _state.println();
  }

  static class LogWriter extends Writer {
    private Logger _log;
    private Level _level;
    private StringBuilder _sb = new StringBuilder();

    LogWriter(Logger log, Level level)
    {
      _log = log;
      _level = level;
    }

    public void write(char ch)
    {
      if (ch == '\n' && _sb.length() > 0) {
	_log.log(_level, _sb.toString());
	_sb.setLength(0);
      }
      else
	_sb.append((char) ch);
    }

    public void write(char []buffer, int offset, int length)
    {
      for (int i = 0; i < length; i++) {
	char ch = buffer[offset + i];
	
	if (ch == '\n' && _sb.length() > 0) {
	  _log.log(_level, _sb.toString());
	  _sb.setLength(0);
	}
	else
	  _sb.append((char) ch);
      }
    }

    public void flush()
    {
    }

    public void close()
    {
    }
  }
}