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/*******************************************************************************
* Copyright (c) 2009 Clark N. Hobbie
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Clark N. Hobbie - initial API and implementation
*******************************************************************************/
package org.eclipse.ecf.ipc.fifo;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.ecf.ipc.IPCException;
public class FIFOInputStream extends InputStream
{
private FIFO myPipe;
private byte[] myBuffer;
private int myIndex;
private boolean myEndOfFile;
private int myDataSize;
private int myTimeout;
public boolean isEndOfFile()
{
return myEndOfFile;
}
public void setEndOfFile(boolean endOfFile)
{
myEndOfFile = endOfFile;
}
public FIFOInputStream(FIFO pipe)
{
initialize(pipe, -1);
}
public FIFOInputStream(FIFO fifo, int timeoutMsec)
{
initialize(fifo, timeoutMsec);
}
protected void initialize(FIFO pipe, int timeoutMsec)
{
myPipe = pipe;
myBuffer = new byte[8192];
myIndex = -1;
setEndOfFile(false);
myTimeout = timeoutMsec;
}
public int read() throws IOException
{
if (isEndOfFile())
return -1;
if (-1 == myIndex || myIndex >= myDataSize)
{
loadBuffer();
}
if (isEndOfFile())
return -1;
int bvalue = myBuffer[myIndex];
myIndex++;
return bvalue;
}
protected int bytesAvailable()
{
if (myIndex < 0)
return 0;
return myDataSize - myIndex;
}
public int read(byte[] buffer, int offset, int length) throws IOException
{
if (isEndOfFile())
return -1;
//
// if we don't currently have any data, load some
//
if (bytesAvailable() < 1)
loadBuffer();
if (isEndOfFile())
return -1;
int count = bytesAvailable();
int index = 0;
while (index < count && index < length && index < buffer.length)
{
buffer[index + offset] = (byte) read();
index++;
}
return count;
}
protected void loadBuffer() throws IOException
{
try
{
if (-1 == myTimeout)
{
myDataSize = myPipe.read(myBuffer);
}
else
{
}
myIndex = 0;
if (-1 == myDataSize)
{
setEndOfFile(true);
}
}
catch (IPCException e)
{
throw new IOException("Error reading data from pipe", e);
}
}
}
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