/* This file is part of VoltDB.
* Copyright (C) 2008-2014 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.concurrent.Callable;
import org.voltcore.utils.DBBPool.BBContainer;
import org.voltcore.utils.Pair;
import org.voltdb.utils.VoltTableUtil;
/*
* Filter that converts snapshot data to CSV format
*/
public class CSVSnapshotFilter implements SnapshotDataFilter {
private final char m_delimiter;
private final char m_fullDelimiters[];
private final byte m_schemaBytes[];
private final ArrayList<VoltType> m_columnTypes;
private int m_lastNumCharacters = 64 * 1024;
public CSVSnapshotFilter(
VoltTable vt,
char delimiter,
char fullDelimiters[]) {
m_columnTypes = new ArrayList<VoltType>(vt.getColumnCount());
for (int ii = 0; ii < vt.getColumnCount(); ii++) {
m_columnTypes.add(vt.getColumnType(ii));
}
m_fullDelimiters = fullDelimiters;
m_delimiter = delimiter;
m_schemaBytes = PrivateVoltTableFactory.getSchemaBytes(vt);
}
@Override
public Callable<BBContainer> filter(final Callable<BBContainer> input) {
return new Callable<BBContainer>() {
@Override
public BBContainer call() throws Exception {
BBContainer cont = input.call();
if (cont == null) {
return null;
}
try {
ByteBuffer buf = ByteBuffer.allocate(m_schemaBytes.length + cont.b().remaining() - 4);
buf.put(m_schemaBytes);
cont.b().position(4);
buf.put(cont.b());
VoltTable vt = PrivateVoltTableFactory.createVoltTableFromBuffer(buf, true);
Pair<Integer, byte[]> p =
VoltTableUtil.toCSV(
vt,
m_columnTypes,
m_delimiter,
m_fullDelimiters,
m_lastNumCharacters);
m_lastNumCharacters = p.getFirst();
final BBContainer origin = cont;
cont = null;
return new BBContainer( ByteBuffer.wrap(p.getSecond())) {
@Override
public void discard() {
checkDoubleFree();
origin.discard();
}
};
} finally {
if (cont != null) {
cont.discard();
}
}
}
};
}
}