com.github.xingshuangs.iot.protocol.s7.model.COTPBuilder Maven / Gradle / Ivy
/*
* 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.protocol.s7.enums.EPduType;
import com.github.xingshuangs.iot.utils.ByteUtil;
import java.util.Arrays;
/**
* @author xingshuang
*/
public class COTPBuilder {
private COTPBuilder() {
// NOOP
}
/**
* Parses byte array and converts it to object.
*
* @param data byte array
* @return COTP
*/
public static COTP fromBytes(final byte[] data) {
int length = ByteUtil.toUInt8(data[0]);
byte[] cotpBytes = Arrays.copyOfRange(data, 0, length + 1);
EPduType pduType = EPduType.from(cotpBytes[1]);
switch (pduType) {
case CONNECT_REQUEST:
case CONNECT_CONFIRM:
case DISCONNECT_REQUEST:
case DISCONNECT_CONFIRM:
return COTPConnection.fromBytes(cotpBytes);
case REJECT:
return null;
case DT_DATA:
return COTPData.fromBytes(cotpBytes);
default:
throw new S7CommException("The pduType data type of COTP cannot be parsed");
}
}
}