/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.client.lob;
import java.io.IOException;
import java.io.InputStream;
import org.teiid.core.CorePlugin;
/**
* A InputStream wrapper class for a Lob Chunks. Given a stream of Lob Chunks
* this class will convert those chunks into InputStream, which can be used to
* stream the lob data.
*/
public class LobChunkInputStream extends InputStream {
private LobChunkProducer reader;
private byte[] byteData = null;
private int currentCounter = 0;
private boolean lastChunk = false;
private boolean closed = false;
public LobChunkInputStream(LobChunkProducer reader) {
this.reader = reader;
}
public int read() throws IOException {
if (this.closed) {
throw new IllegalStateException(CorePlugin.Util.getString("stream_closed")); //$NON-NLS-1$
}
while (this.byteData == null || this.byteData.length <= currentCounter) {
if (this.lastChunk) {
// we are done
return -1;
}
LobChunk value = this.reader.getNextChunk();
this.lastChunk = value.isLast();
this.byteData = value.getBytes();
this.currentCounter = 0;
}
// so we have data
return (byteData[currentCounter++] & 0xFF);
}
/**
* @see java.io.InputStream#close()
*/
public void close() throws IOException {
this.closed = true;
this.reader.close();
}
}