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/*******************************************************************************
* Copyright (c) 2010 BSI Business Systems Integration AG.
* 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:
* BSI Business Systems Integration AG - initial API and implementation
******************************************************************************/
package org.eclipse.scout.rt.shared.services.common.file;
/**
* @version 3.x
*/
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Writer;
import java.util.zip.CRC32;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
public class CompressedWriter extends Writer {
private static final String DEFAULT_CHARSETNAME = "UTF-8";
private RemoteFile m_remoteFile;
private ByteArrayOutputStream m_buffer;
private Deflater m_deflater;
private DeflaterOutputStream m_deflaterOutputStream;
private CRC32 m_crc32;
private String m_charsetName = DEFAULT_CHARSETNAME;
public CompressedWriter(RemoteFile f) {
this(f, DEFAULT_CHARSETNAME);
}
public CompressedWriter(RemoteFile f, String charsetName) {
m_remoteFile = f;
m_charsetName = charsetName;
m_buffer = new ByteArrayOutputStream();
m_deflater = new Deflater(Deflater.BEST_COMPRESSION);
m_deflaterOutputStream = new DeflaterOutputStream(m_buffer, m_deflater);
m_crc32 = new CRC32();
}
@Override
public void close() throws IOException {
flush();
m_deflater.finish();
m_deflaterOutputStream.finish();
m_deflaterOutputStream.close();
m_deflater.end();
m_buffer.close();
m_remoteFile.setCompressedData(m_buffer.toByteArray(), m_crc32.getValue());
}
@Override
public void flush() throws IOException {
m_deflaterOutputStream.flush();
m_buffer.flush();
}
@Override
// written chars (to m_buffer) encoded in Charset.defaultCharset()
public void write(char[] cbuf, int off, int len) throws IOException { // schreibt
// chars
// nach
// m_buffer
// (in
// remote_file)
try {
String str = new String(cbuf, off, len);
byte[] b = str.getBytes(m_charsetName);
m_crc32.update(b, 0, b.length);
m_deflaterOutputStream.write(b, 0, b.length);
flush();
}
catch (Exception e) {
throw new IOException(e.getMessage());
}
}
}
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