com.github.xingshuangs.iot.protocol.s7.model.Datum Maven / Gradle / Ivy

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/*
 * MIT License
 *
 * Copyright (c) 2021-2099 Oscura (xingshuang) 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.xingshuangs.iot.protocol.s7.model;


import com.github.xingshuangs.iot.exceptions.S7CommException;
import com.github.xingshuangs.iot.common.IObjectByteArray;
import com.github.xingshuangs.iot.protocol.s7.enums.EFunctionCode;
import com.github.xingshuangs.iot.protocol.s7.enums.EMessageType;
import lombok.Data;

/**
 * 数据
 *
 * @author xingshuang
 */
@Data
public class Datum implements IObjectByteArray {

    @Override
    public int byteArrayLength() {
        return 0;
    }

    @Override
    public byte[] toByteArray() {
        return new byte[0];
    }

    /**
     * 根据消息类型和功能码，对字节数组数据进行解析
     *
     * @param data         字节数组数据
     * @param messageType  头部的消息类型
     * @param functionCode 参数部分的功能码
     * @return Datum
     */
    public static Datum fromBytes(final byte[] data, EMessageType messageType, EFunctionCode functionCode) {

        switch (functionCode) {
            case READ_VARIABLE:
            case WRITE_VARIABLE:
                return ReadWriteDatum.fromBytes(data, messageType, functionCode);
            case DOWNLOAD:
            case UPLOAD:
                return UpDownloadDatum.fromBytes(data, messageType);
            default:
                throw new S7CommException("function code not recognized");
        }
    }
}