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/*****************************************************************************
* Copyright (c) 2013, 2017 CEA LIST.
*
* 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:
* CEA LIST - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.cdo.internal.ui.customization.properties.storage;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import org.eclipse.emf.cdo.common.lob.CDOClob;
/**
* An input stream for reading {@link CDOClob}s.
*/
public class ClobInputStream extends InputStream {
private static final int BUFFER_SIZE_IN_CHARS = 2048;
private static final int MASK = 0xFF;
private static final int EOF = -1;
private final Charset charset;
private Reader reader;
private CharBuffer chars = CharBuffer.allocate(BUFFER_SIZE_IN_CHARS);
private ByteBuffer buffer;
public ClobInputStream(CDOClob clob, String encoding) throws IOException {
this.reader = clob.getContents();
this.charset = Charset.forName((encoding == null) ? "UTF-8" : encoding); //$NON-NLS-1$
}
@Override
public void close() throws IOException {
if (reader != null) {
reader.close();
reader = null;
buffer = null;
chars = null;
}
}
@Override
public int read() throws IOException {
checkClosed();
checkBuffer();
if (buffer != null) {
return buffer.get() & MASK;
}
return EOF;
}
private void checkBuffer() throws IOException {
if ((buffer == null) || !buffer.hasRemaining()) {
buffer = null;
createBuffer();
}
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
checkClosed();
if (len == 0) {
return 0;
}
checkBuffer();
if (buffer == null) {
return EOF;
}
int count = 0;
do {
checkBuffer();
if (buffer == null) {
// no more to read
break;
}
int toRead = Math.min(buffer.remaining(), len - count);
buffer.get(b, off + count, toRead);
count = count + toRead;
} while (count < len);
return count;
}
@Override
public int available() throws IOException {
checkClosed();
checkBuffer();
if (buffer != null) {
return buffer.remaining();
}
return 0;
}
protected final void checkClosed() throws IOException {
if (reader == null) {
throw new IOException("CLOB reader is closed"); //$NON-NLS-1$
}
}
private void createBuffer() throws IOException {
checkClosed();
chars.rewind();
int count = reader.read(chars);
if (count > 0) {
chars.flip();
buffer = charset.encode(chars);
}
}
}
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