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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. and others. 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:
* William Chen (Wind River)- [345387]Open the remote files with a proper editor
*******************************************************************************/
package org.eclipse.tcf.te.tcf.filesystem.core.internal.url;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.tcf.protocol.IToken;
import org.eclipse.tcf.services.IFileSystem.DoneRead;
import org.eclipse.tcf.services.IFileSystem.FileSystemException;
import org.eclipse.tcf.te.tcf.filesystem.core.nls.Messages;
/**
* The TCF input stream returned by {@link TcfURLConnection#getInputStream()}.
*/
public class TcfInputStream extends InputStream {
// Default chunk size while pumping the data.
private static final int DEFAULT_CHUNK_SIZE = 5 * 1024;
// Current reading position
long position;
// The byte array used to buffer data.
byte[] buffer;
// The offset being read in the buffer.
int offset;
// If the reading has reached the end of the file.
boolean EOF;
// If the stream has been closed.
boolean closed;
// The current error during reading.
Exception ERROR;
// The chunk size of the reading buffer.
int chunk_size = 0;
// The URL Connection
TcfURLConnection connection;
/**
* Create a TCF input stream connected the specified peer with specified
* path to the remote resource.
*
* @param peer
* The TCF agent peer.
* @param path
* The path to the remote resource.
*/
public TcfInputStream(TcfURLConnection connection) {
this(connection, DEFAULT_CHUNK_SIZE);
}
/**
* Create a TCF input stream connected the specified peer with specified
* path to the remote resource using the specified buffer size.
*
* @param peer
* The TCF agent peer.
* @param path
* The path to the remote resource.
* @param chunk_size
* The buffer size.
*/
public TcfInputStream(TcfURLConnection connection, int chunk_size) {
this.connection = connection;
this.chunk_size = chunk_size;
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read()
*/
@Override
public int read() throws IOException {
if (closed)
throw new IOException(Messages.TcfInputStream_StreamClosed);
if (ERROR != null) {
IOException exception = new IOException(ERROR.toString());
exception.initCause(ERROR);
throw exception;
}
if (buffer == null) {
if (EOF) {
return -1;
}
readBlock();
return read();
}
if (EOF) {
if (offset == buffer.length) {
return -1;
}
// Note that convert the byte to an integer correctly
return 0xff & buffer[offset++];
}
if (offset == buffer.length) {
readBlock();
return read();
}
// Note that convert the byte to an integer correctly
return 0xff & buffer[offset++];
}
/**
* Read a block of data into the buffer. Reset the offset, increase the
* current position and remember the EOF status. If there's an error,
* remember it for read() to check.
*/
private void readBlock() {
connection.service.read(connection.handle, position, chunk_size, new DoneRead() {
@Override
public void doneRead(IToken token, FileSystemException error, byte[] data, boolean eof) {
if (error != null) {
ERROR = error;
}
if (data == null) {
ERROR = new IOException(Messages.TcfInputStream_NoDataAvailable);
}
EOF = eof;
buffer = data;
if (buffer != null)
position += buffer.length;
offset = 0;
}
});
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#close()
*/
@Override
public void close() throws IOException {
if (!closed) {
connection.closeStream(this);
closed = true;
}
}
}
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