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/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000, 2001,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: InputBuffer.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.arjuna.state;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import com.arjuna.ats.arjuna.logging.tsLogger;
/**
* An InputBuffer is used to retrieve various Java types from a byte stream
* created using an OutputBuffer. Similar to java serialization. However,
* InputBuffers are compatible with OTSArjuna states.
*
* @author Mark Little ([email protected])
* @version $Id: InputBuffer.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.0.
*/
public class InputBuffer
{
/**
* Create a new buffer.
*/
public InputBuffer()
{
_byteArray = null;
_valid = false;
_inputStream = null;
_input = null;
}
/**
* Create our own copy of the byte array.
*/
public InputBuffer(byte b[])
{
_valid = true;
_byteArray = new byte[b.length];
System.arraycopy(b, 0, _byteArray, 0, b.length);
try
{
_inputStream = new ByteArrayInputStream(_byteArray);
_input = new DataInputStream(_inputStream);
skipHeader();
}
catch (IOException e)
{
_valid = false;
}
}
/**
* Create a new buffer and copy the provided one.
*/
public InputBuffer(InputBuffer buff)
{
_byteArray = null;
_valid = false;
_inputStream = null;
_input = null;
copy(buff);
}
/**
* Is the buffer valid?
*/
public final synchronized boolean valid ()
{
return _valid;
}
/**
* Copy the existing buffer.
*/
public synchronized void copy (InputBuffer buff)
{
if (buff._valid)
{
_byteArray = new byte[buff._byteArray.length];
_valid = true;
System.arraycopy(buff._byteArray, 0, _byteArray, 0,
buff._byteArray.length);
try
{
_inputStream = new ByteArrayInputStream(_byteArray);
_input = new DataInputStream(_inputStream);
skipHeader();
}
catch (IOException e)
{
_valid = false;
}
}
}
/**
* Return the length of the byte buffer.
*/
public final synchronized int length ()
{
return ((_byteArray == null) ? 0 : _byteArray.length);
}
/**
* Return the internal byte buffer.
*/
public final synchronized byte[] buffer ()
{
return _byteArray;
}
/**
* Set the buffer to be used by this instance.
*/
public final synchronized void setBuffer (byte[] b)
{
_byteArray = new byte[b.length];
System.arraycopy(b, 0, _byteArray, 0, b.length);
try
{
_inputStream = new ByteArrayInputStream(_byteArray);
_input = new DataInputStream(_inputStream);
_valid = true;
skipHeader();
}
catch (Exception e)
{
_byteArray = null;
_valid = false;
}
}
/**
* Unpack a byte from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown.
*/
public final synchronized byte unpackByte () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_1());
int i = unpackInt();
return (byte) i;
}
/**
* Unpack the next byte array from the stream. If the next item in the
* buffer is not of the right type then an IOException is thrown.
*/
public final synchronized byte[] unpackBytes () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_2());
int size = unpackInt();
byte b[] = new byte[size];
if (size > 0)
{
_input.read(b, 0, size);
realign(size);
}
return b;
}
/**
* Unpack a boolean from the stream. If the next item in the buffer is not
* of the right type then an IOException is thrown.
*/
public final synchronized boolean unpackBoolean () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_3());
_valid = false;
_inputStream.skip(3);
boolean b = _input.readBoolean();
_valid = true;
return b;
}
/**
* Unpack a character from the stream. If the next item in the buffer is not
* of the right type then an IOException is thrown.
*/
public final synchronized char unpackChar () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_4());
int i = unpackInt();
return (char) i;
}
/**
* Unpack a short from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown.
*/
public final synchronized short unpackShort () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_5());
int i = unpackInt();
return (short) i;
}
/**
* Unpack an integer from the stream. If the next item in the buffer is not
* of the right type then an IOException is thrown.
*/
public final synchronized int unpackInt () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_6());
_valid = false;
int i = _input.readInt();
_valid = true;
return i;
}
/**
* Unpack a long from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown.
*/
public final synchronized long unpackLong () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_7());
_valid = false;
long l = _input.readLong();
_valid = true;
return l;
}
/**
* Unpack a float from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown.
*/
public final synchronized float unpackFloat () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_8());
_valid = false;
float f = _input.readFloat();
_valid = true;
return f;
}
/**
* Unpack a double from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown.
*/
public final synchronized double unpackDouble () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_9());
_valid = false;
double d = _input.readDouble();
_valid = true;
return d;
}
/**
* Unpack a String from the stream. If the next item in the buffer is not of
* the right type then an IOException is thrown. Currently different from
* the C++ version in that a distinct new instance will always be returned,
* rather than a reference to a previously returned object in the case of
* the "same" string.
*/
public final synchronized String unpackString () throws IOException
{
if (!_valid)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_10());
int length = unpackInt();
if (length == 0)
return null;
/*
* We don't need the '\0' character which Arjuna puts in the buffer. We
* only put it in for compatibility with C++. So ignore it.
*/
byte[] b = new byte[length - 1];
byte[] dummy = new byte[1];
_input.read(b, 0, length - 1);
_input.read(dummy, 0, 1);
realign(length);
return new String(b);
}
/**
* Unpack a buffer from the provided buffer, and initialise this instance
* with it. If the next item in the buffer is not of the right type then an
* IOException is thrown.
*/
public synchronized void unpackFrom (InputBuffer buff) throws IOException
{
if (buff == null)
throw new IOException(tsLogger.i18NLogger.get_state_InputBuffer_11());
_valid = false;
/*
* unpack number of bytes, then create new byte array and unpack each
* byte separately.
*/
_byteArray = buff.unpackBytes();
_valid = true;
try
{
_inputStream = new ByteArrayInputStream(_byteArray);
_input = new DataInputStream(_inputStream);
skipHeader();
}
catch (IOException e)
{
_valid = false;
}
}
/**
* Reset the read pointer for this buffer.
*/
public final boolean reread ()
{
if (!_valid)
return false;
try
{
_inputStream = new ByteArrayInputStream(_byteArray);
_input = new DataInputStream(_inputStream);
skipHeader();
}
catch (IOException e)
{
_valid = false;
}
return _valid;
}
/**
* Print information about this instance.
*/
public void print (PrintWriter strm)
{
if (_valid)
{
strm.println("InputBuffer : \n");
strm.println("InputBuffer : \n");
for (int i = 0; i < _byteArray.length; i++)
strm.write((char) _byteArray[i]);
}
else
strm.println("InputBuffer : invalid.");
}
private final void realign (int amount) throws IOException
{
if ((amount % OutputBuffer.ALIGNMENT) > 0)
{
int excess = OutputBuffer.ALIGNMENT
- (amount % OutputBuffer.ALIGNMENT);
if (_inputStream.available() < excess)
excess = _inputStream.available();
_input.skipBytes(excess);
}
}
private final void skipHeader () throws IOException
{
_inputStream.skip(OutputBuffer.headerSize); // sizeof buffer header
}
protected boolean _valid;
private DataInputStream _input;
private ByteArrayInputStream _inputStream;
private byte[] _byteArray;
}
