ChannelAddress.java

/*
 * Copyright 2011-16 Fraunhofer ISE
 *
 * This file is part of OpenMUC.
 * For more information visit http://www.openmuc.org
 *
 * OpenMUC is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenMUC 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenMUC.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openmuc.framework.driver.dlms;

import org.openmuc.jdlms.client.GetRequest;
import org.openmuc.jdlms.client.ObisCode;

public class ChannelAddress {

    private final int classId;
    private final ObisCode instanceId;
    private final String printableInstanceId;
    private final int attributeId;

    public ChannelAddress(int classId, String instanceId, int attributeId) {
        this.classId = classId;
        printableInstanceId = instanceId;
        this.instanceId = parseInstanceId(instanceId);
        this.attributeId = attributeId;
    }

    public ChannelAddress(int classId, byte[] instanceId, int attributeId) {
        this.classId = classId;
        printableInstanceId = parseInstanceId(instanceId);
        this.instanceId = parseInstanceId(printableInstanceId);
        this.attributeId = attributeId;
    }

    public static ChannelAddress parse(String input) {
        String[] tokens = input.split("/");
        if (tokens.length != 3) {
            throw new IllegalArgumentException("Channel address must be of format 'classId/logicalName/attributeId'");
        }

        int classId = Integer.parseInt(tokens[0]);
        int attributeId = Integer.parseInt(tokens[2]);
        String instanceId = tokens[1];

        return new ChannelAddress(classId, instanceId, attributeId);
    }

    private static ObisCode parseInstanceId(String idString) {
        ObisCode result = null;

        String tokens[] = idString.split("\\.");

        if (tokens.length == 1 && idString.length() == 12) {
            byte instanceId[] = new byte[6];
            for (int i = 0; i < idString.length(); i += 2) {
                instanceId[i / 2] = (byte) Integer.parseInt(idString.substring(i, i + 2), 16);
            }
            result = new ObisCode(instanceId[0], instanceId[1], instanceId[2], instanceId[3], instanceId[4],
                    instanceId[5]);
        }
        else if (tokens.length == 6) {
            result = new ObisCode(Integer.parseInt(tokens[0]), Integer.parseInt(tokens[1]), Integer.parseInt(tokens[2]),
                    Integer.parseInt(tokens[3]), Integer.parseInt(tokens[4]), Integer.parseInt(tokens[5]));
        }
        else {
            throw new IllegalArgumentException("Reduced ID codes are not supported");
        }

        return result;
    }

    private static String parseInstanceId(byte[] instanceId) {
        StringBuilder result = new StringBuilder();

        result.append(Integer.toString(instanceId[0] & 0xff));
        for (int i = 1; i < instanceId.length; i++) {
            result.append(".").append(Integer.toString(instanceId[i] & 0xff));
        }

        return result.toString();
    }

    public int getClassId() {
        return classId;
    }

    public ObisCode getInstanceId() {
        return instanceId;
    }

    public int getAttributeId() {
        return attributeId;
    }

    public GetRequest createGetRequest() {
        return new GetRequest(classId, instanceId, attributeId);
    }

    @Override
    public String toString() {
        return classId + "/" + printableInstanceId + "/" + attributeId;
    }
}