ObservableRegister.java

/***
 * Copyright 2002-2010 jamod development team
 *
 * 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 net.wimpi.modbus.procimg;

import net.wimpi.modbus.util.Observable;

/**
 * Class implementing an observable register.
 *
 * @author Dieter Wimberger
 * @version @version@ (@date@)
 */
public class ObservableRegister extends Observable implements Register {

    /**
     * The word (<tt>byte[2]</tt> holding the content of this register.
     */
    protected byte[] m_Register = new byte[2];

    @Override
    public int getValue() {
        return ((m_Register[0] & 0xff) << 8 | (m_Register[1] & 0xff));
    }// getValue

    @Override
    public final int toUnsignedShort() {
        return ((m_Register[0] & 0xff) << 8 | (m_Register[1] & 0xff));
    }// toUnsignedShort

    @Override
    public final synchronized void setValue(int v) {
        m_Register[0] = (byte) (0xff & (v >> 8));
        m_Register[1] = (byte) (0xff & v);
        notifyObservers("value");
    }// setValue

    @Override
    public final short toShort() {
        return (short) ((m_Register[0] << 8) | (m_Register[1] & 0xff));
    }// toShort

    @Override
    public final synchronized void setValue(short s) {
        m_Register[0] = (byte) (0xff & (s >> 8));
        m_Register[1] = (byte) (0xff & s);
        notifyObservers("value");
    }// setValue

    @Override
    public final synchronized void setValue(byte[] bytes) {
        if (bytes.length < 2) {
            throw new IllegalArgumentException();
        } else {
            m_Register[0] = bytes[0];
            m_Register[1] = bytes[1];
            notifyObservers("value");
        }
    }// setValue

    @Override
    public byte[] toBytes() {
        return m_Register;
    }// toBytes

}// class ObservableRegister