com.exigen.ie.constrainer.impl.ConstraintFloatExpMoreValue Maven / Gradle / Ivy

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package com.exigen.ie.constrainer.impl;
import com.exigen.ie.constrainer.Constraint;
import com.exigen.ie.constrainer.ConstraintImpl;
import com.exigen.ie.constrainer.EventOfInterest;
import com.exigen.ie.constrainer.Failure;
import com.exigen.ie.constrainer.FloatEvent;
import com.exigen.ie.constrainer.FloatExp;
import com.exigen.ie.constrainer.Goal;
import com.exigen.ie.constrainer.IntBoolExp;
import com.exigen.ie.constrainer.Observer;
import com.exigen.ie.constrainer.Subject;

///////////////////////////////////////////////////////////////////////////////
/*
 * Copyright Exigen Group 1998, 1999, 2000
 * 320 Amboy Ave., Metuchen, NJ, 08840, USA, www.exigengroup.com
 *
 * The copyright to the computer program(s) herein
 * is the property of Exigen Group, USA. All rights reserved.
 * The program(s) may be used and/or copied only with
 * the written permission of Exigen Group
 * or in accordance with the terms and conditions
 * stipulated in the agreement/contract under which
 * the program(s) have been supplied.
 */
///////////////////////////////////////////////////////////////////////////////

//
//: ConstraintFloatExpMoreValue.java
//
/**
 * An implementation of the constraint: FloatExp ge value.
 */
public final class ConstraintFloatExpMoreValue extends ConstraintImpl
{
  // PRIVATE MEMBERS
  private FloatExp	_exp;
  private double    _value;
  private Constraint _opposite;

  public ConstraintFloatExpMoreValue(FloatExp exp, double value)
  {
    super(exp.constrainer(),"");//exp.name()+">="+value);
    _name = "";
    if (constrainer().showInternalNames())
      _name = exp.name()+">="+value;
    _exp = exp;
    _value = value;
    _opposite = null;
  }

  public Goal execute() throws Failure
  {
    class ObserverFloatMoreValue extends Observer
    {
      public void update(Subject exp, EventOfInterest interest)	throws Failure
      {
        //Debug.on();Debug.print("ObserverFloatMoreValue: "+interest);Debug.off();
        FloatEvent event = (FloatEvent)interest;
        if(FloatCalc.gt (_value, event.max ())) {
//          System.out.println("???ObserverFloatMoreValue: max < value: "+event.max()+"<"+_value);
          exp.constrainer().fail("from ObserverFloatMoreValue");
        }

        _exp.setMin(_value);
      }

      public int subscriberMask()
      {
         return EventOfInterest.VALUE | EventOfInterest.MAX;
      }

      public String toString()
      {
        return "ObserverFloatMoreValue";
      }

      public Object master()
      {
        return ConstraintFloatExpMoreValue.this;
      }

    } //~ ObserverFloatMoreValue

    _exp.setMin(_value); // may fail
    _exp.attachObserver(new ObserverFloatMoreValue());
    return null;
  }

  public Constraint opposite()
  {
    if (_opposite == null)
      _opposite = new ConstraintFloatExpLessValue(_exp,_value);
    return _opposite;
  }

  public boolean isLinear(){
    return _exp.isLinear();
  }

  public IntBoolExp toIntBoolExp(){
    return _exp.ge(_value);
  }

  public String toString()
  {
    return _exp+">="+_value;
  }

} //eof ConstraintFloatExpMoreValue