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///////////////////////////////////////////////////////////////////////////////
//Copyright (C) 2014 Joliciel Informatique
//
//This file is part of Talismane.
//
//Talismane is free software: you can redistribute it and/or modify
//it under the terms of the GNU Affero General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//Talismane 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 Affero General Public License for more details.
//
//You should have received a copy of the GNU Affero General Public License
//along with Talismane.  If not, see .
//////////////////////////////////////////////////////////////////////////////
package com.joliciel.talismane.machineLearning.features;

import com.joliciel.talismane.TalismaneException;

/**
 * Returns operand1 - operand2.
 * 
 * @author Assaf Urieli
 *
 */
public class MinusOperator extends AbstractCachableFeatureimplements DoubleFeature {
  private DoubleFeature operand1;
  private DoubleFeature operand2;

  public MinusOperator(DoubleFeature operand1, DoubleFeature operand2) {
    super();
    this.operand1 = operand1;
    this.operand2 = operand2;
    this.setName("(" + operand1.getName() + "-" + operand2.getName() + ")");
  }

  @Override
  protected FeatureResult checkInternal(T context, RuntimeEnvironment env) throws TalismaneException {
    FeatureResult featureResult = null;

    FeatureResult operand1Result = operand1.check(context, env);
    FeatureResult operand2Result = operand2.check(context, env);

    if (operand1Result != null && operand2Result != null) {
      double result = operand1Result.getOutcome() - operand2Result.getOutcome();
      featureResult = this.generateResult(result);
    }

    return featureResult;

  }

  public DoubleFeature getOperand1() {
    return operand1;
  }

  public DoubleFeature getOperand2() {
    return operand2;
  }

  public void setOperand1(DoubleFeature operand1) {
    this.operand1 = operand1;
  }

  public void setOperand2(DoubleFeature operand2) {
    this.operand2 = operand2;
  }

}