PacketUtil.java

/*
 * Copyright 1999-2012 Alibaba Group.
 * 
 * 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 fm.liu.timo.mysql;

import java.io.UnsupportedEncodingException;
import fm.liu.timo.config.ErrorCode;
import fm.liu.timo.mysql.packet.ErrorPacket;
import fm.liu.timo.mysql.packet.FieldPacket;
import fm.liu.timo.mysql.packet.ResultSetHeaderPacket;

/**
 * @author xianmao.hexm
 */
public class PacketUtil {
    private static final String CODE_PAGE_1252 = "Cp1252";

    public static final ResultSetHeaderPacket getHeader(int fieldCount) {
        ResultSetHeaderPacket packet = new ResultSetHeaderPacket();
        packet.packetId = 1;
        packet.fieldCount = fieldCount;
        return packet;
    }

    public static byte[] encode(String src, String charset) {
        if (src == null) {
            return null;
        }
        try {
            return src.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            return src.getBytes();
        }
    }

    public static final FieldPacket getField(String name, String orgName, int type) {
        FieldPacket packet = new FieldPacket();
        packet.charsetIndex = CharsetUtil.getIndex(CODE_PAGE_1252);
        packet.name = encode(name, CODE_PAGE_1252);
        packet.orgName = encode(orgName, CODE_PAGE_1252);
        packet.type = (byte) type;
        return packet;
    }

    public static final FieldPacket getField(String name, int type) {
        FieldPacket packet = new FieldPacket();
        packet.charsetIndex = CharsetUtil.getIndex(CODE_PAGE_1252);
        packet.name = encode(name, CODE_PAGE_1252);
        packet.type = (byte) type;
        return packet;
    }

    public static final ErrorPacket getShutdown() {
        ErrorPacket error = new ErrorPacket();
        error.packetId = 1;
        error.errno = ErrorCode.ER_SERVER_SHUTDOWN;
        error.message = "The server has been shutdown".getBytes();
        return error;
    }

}