/* This file is part of VoltDB.
* Copyright (C) 2008-2017 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.io.IOException;
import java.util.concurrent.Future;
import org.voltdb.utils.CompressionService;
/**
* Helper class to compress a table's internal buffer.
*
* This code was removed from core VoltTable so VoltTables could be used
* without depending on the CompressionService.
*
*/
public class TableCompressor {
public static byte[] getCompressedTableBytes(VoltTable t) throws IOException {
final int startPosition = t.m_buffer.position();
try {
t.m_buffer.position(0);
if (t.m_buffer.isDirect()) {
return CompressionService.compressBuffer(t.m_buffer);
} else {
assert(t.m_buffer.hasArray());
return CompressionService.compressBytes(
t.m_buffer.array(),
t.m_buffer.arrayOffset() + t.m_buffer.position(),
t.m_buffer.limit());
}
} finally {
t.m_buffer.position(startPosition);
}
}
public static Future<byte[]> getCompressedTableBytesAsync(VoltTable t) throws IOException {
final int startPosition = t.m_buffer.position();
try {
t.m_buffer.position(0);
if (t.m_buffer.isDirect()) {
return CompressionService.compressBufferAsync(t.m_buffer.duplicate());
} else {
assert(t.m_buffer.hasArray());
return CompressionService.compressBytesAsync(
t.m_buffer.array(),
t.m_buffer.arrayOffset() + t.m_buffer.position(),
t.m_buffer.limit());
}
} finally {
t.m_buffer.position(startPosition);
}
}
}