bytesmessageimpl.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 765 行 · 第 1/2 页

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.jms.message;

import com.caucho.jms.JMSExceptionWrapper;
import com.caucho.util.CharBuffer;
import com.caucho.vfs.*;

import javax.jms.BytesMessage;
import javax.jms.JMSException;
import javax.jms.MessageEOFException;
import javax.jms.MessageFormatException;
import java.io.*;
import java.util.logging.Level;

/**
 * A byte-stream message.
 */
public class BytesMessageImpl extends MessageImpl implements BytesMessage {
  private TempStream _tempStream;
  private ReadStream _rs;
  private WriteStream _ws;

  public BytesMessageImpl()
  {
  }

  BytesMessageImpl(BytesMessage bytes)
    throws JMSException
  {
    super(bytes);

    bytes.reset();

    checkBodyWriteable();

    try {
      TempBuffer tempBuf = TempBuffer.allocate();
      byte []buffer = tempBuf.getBuffer();
      WriteStream out = getWriteStream();

      int sublen;
    
      while ((sublen = bytes.readBytes(buffer, buffer.length)) > 0) {
        out.write(buffer, 0, sublen);
      }

      TempBuffer.free(tempBuf);
      tempBuf = null;
    } catch (IOException e) {
      log.log(Level.FINE, e.toString(), e);
      
      throw new JMSException(e.toString());
    }

    reset();
  }

  BytesMessageImpl(BytesMessageImpl bytes)
    throws JMSException
  {
    super(bytes);

    bytes.reset();

    _tempStream = bytes._tempStream;

    reset();
  }

  /**
   * Returns the type enumeration.
   */
  @Override
  public MessageType getType()
  {
    return MessageType.BYTES;
  }

  /**
   * Sets the body for reading.
   */
  public void setReceive()
    throws JMSException
  {
    super.setReceive();
    
    reset();
  }

  /**
   * Set the stream for reading.
   */
  public void reset()
    throws JMSException
  {
    setBodyReadOnly();
    
    try {
      // XXX: test for null
      if (_ws != null)
	_ws.close();

      if (_tempStream != null) {
	if (_rs != null)
	  _rs.close();
	
	_rs = _tempStream.openReadAndSaveBuffer();
      }
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a boolean from the stream.
   */
  public boolean readBoolean()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int value = is.read();

      if (value >= 0)
        return value == 1;
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a byte from the stream.
   */
  public byte readByte()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int value = is.read();

      if (value >= 0)
        return (byte) value;
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read an unsigned byte from the stream.
   */
  public int readUnsignedByte()
    throws JMSException
  {
    ReadStream is = getReadStream();

    if (is == null)
      return -1;

    try {
      int value = is.read();

      if (value >= 0)
        return value;
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a short from the stream.
   */
  public short readShort()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int d1 = is.read();    
      int d2 = is.read();    

      if (d2 >= 0)
        return (short) ((d1 << 8) + d2);
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read an unsigned short from the stream.
   */
  public int readUnsignedShort()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int d1 = is.read();    
      int d2 = is.read();    

      if (d2 >= 0)
        return ((d1 << 8) + d2);
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read an integer from the stream.
   */
  public int readInt()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int d1 = is.read();    
      int d2 = is.read();    
      int d3 = is.read();    
      int d4 = is.read();    

      if (d4 >= 0)
        return (d1 << 24) + (d2 << 16) + (d3 << 8) + d4;
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a long from the stream.
   */
  public long readLong()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      long d1 = is.read();    
      long d2 = is.read();    
      long d3 = is.read();    
      long d4 = is.read();    
      long d5 = is.read();    
      long d6 = is.read();    
      long d7 = is.read();    
      long d8 = is.read();    

      if (d8 >= 0) {
        return ((d1 << 56)
                + (d2 << 48)
                + (d3 << 40)
                + (d4 << 32)
                + (d5 << 24)
                + (d6 << 16)
                + (d7 << 8)
                + (d8));
      }
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a float from the stream.
   */
  public float readFloat()
    throws JMSException
  {
    return Float.intBitsToFloat(readInt());
  }

  /**
   * Read a double from the stream.
   */
  public double readDouble()
    throws JMSException
  {
    return Double.longBitsToDouble(readLong());
  }

  /**
   * Read a character object from the stream.
   */
  public char readChar()
    throws JMSException
  {
    ReadStream is = getReadStream();

    try {
      int d1 = is.read();    
      int d2 = is.read();

      if (d2 >= 0)
        return (char) ((d1 << 8) + d2);
      else
        throw new MessageEOFException("BytesMessage EOF");
    } catch (IOException e) {
      throw new JMSExceptionWrapper(e);
    }
  }

  /**
   * Read a string from the stream.
   */
  public String readUTF()
    throws JMSException
  {
    ReadStream is = getReadStream();
    CharBuffer cb = new CharBuffer();

    try {
      int len = readShort();

      int d1;
      
      while (len > 0) {
        d1 = is.read();
        
        if (d1 < 0x80) {
          cb.append((char) d1);
          len -= 1;
        }
        else if ((d1 & 0xe0) == 0xc0) {
          int d2 = is.read();

          cb.append((char) (((d1 & 0x1f) << 6) + (d2 & 0x3f)));

          len -= 2;
        }
        else if ((d1 & 0xf0) == 0xe0) {
          int d2 = is.read();
          int d3 = is.read();

          cb.append((char) (((d1 & 0xf) << 12)
                            + ((d2 & 0x3f) << 6)
                            + (d3 & 0x3f)));

          len -= 3;
        }
	else
	  throw new MessageFormatException(L.l("invalid UTF-8 in bytes message"));