/*
* Copyright 2012-2015 org.opencloudb.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.opencloudb.server.response;
import java.nio.ByteBuffer;
import org.opencloudb.config.Fields;
import org.opencloudb.config.Versions;
import org.opencloudb.mysql.PacketUtil;
import org.opencloudb.net.mysql.EOFPacket;
import org.opencloudb.net.mysql.FieldPacket;
import org.opencloudb.net.mysql.ResultSetHeaderPacket;
import org.opencloudb.net.mysql.RowDataPacket;
import org.opencloudb.server.ServerConnection;
/**
* @author mycat
*/
public class SelectVersion {
private static final int FIELD_COUNT = 1;
private static final ResultSetHeaderPacket header = PacketUtil.getHeader(FIELD_COUNT);
private static final FieldPacket[] fields = new FieldPacket[FIELD_COUNT];
private static final EOFPacket eof = new EOFPacket();
static {
int i = 0;
byte packetId = 0;
header.packetId = ++packetId;
fields[i] = PacketUtil.getField("VERSION()", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
eof.packetId = ++packetId;
}
public static void response(ServerConnection c) {
ByteBuffer buffer = c.allocate();
buffer = header.write(buffer, c);
for (FieldPacket field : fields) {
buffer = field.write(buffer, c);
}
buffer = eof.write(buffer, c);
byte packetId = eof.packetId;
RowDataPacket row = new RowDataPacket(FIELD_COUNT);
row.add(Versions.SERVER_VERSION);
row.packetId = ++packetId;
buffer = row.write(buffer, c);
EOFPacket lastEof = new EOFPacket();
lastEof.packetId = ++packetId;
buffer = lastEof.write(buffer, c);
c.write(buffer);
}
}