net.wimpi.modbus.procimg.SimpleDigitalIn Maven / Gradle / Ivy

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jamod is an object oriented implementation of the Modbus protocol, realized 100% in Java. It allows to quickly realize master and slave applications in various transport flavors (IP and serial).

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/***
 * 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;

/**
 * Class implementing a simple DigitalIn.
 * 
 * The set method is synchronized, which ensures atomic
 * access, but no specific access order.
 *
 * @author Dieter Wimberger
 * @version 1.2 (@date@)
 */
public class SimpleDigitalIn implements DigitalIn {

  /**
   * Field for the digital in state.
   */
  protected boolean m_Set = false;

  /**
   * Constructs a new SimpleDigitalIn instance.
   */
  public SimpleDigitalIn() {
  }//constructor

  /**
   * Constructs a new SimpleDigitalIn instance
   * with a given valid state.
   *
   * @param b true if to be set, false otherwise.
   */
  public SimpleDigitalIn(boolean b) {
    set(b);
  }//constructor(boolean)

  public boolean isSet() {
    return m_Set;
  }//isSet

  /**
   * Sets the state of this SimpleDigitalIn.
   * This method should only be used from master/device
   * side.
   *
   * @param b true if to be set, false otherwise.
   */
  public synchronized void set(boolean b) {
    m_Set = b;
  }//set

}//SimpleDigitalIn