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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;

/**
 * If the condition returns true, return null, else return the result of the
 * feature provided.
 * 
 * @author Assaf Urieli
 *
 */
public class NullIfDoubleFeature extends AbstractCachableFeatureimplements DoubleFeature {
  private BooleanFeature condition;
  private DoubleFeature resultFeature;

  public NullIfDoubleFeature(BooleanFeature condition, DoubleFeature resultFeature) {
    super();
    this.condition = condition;
    this.resultFeature = resultFeature;
    this.setName("NullIf(" + condition.getName() + "," + resultFeature.getName() + ")");
  }

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

    FeatureResult conditionResult = condition.check(context, env);
    if (conditionResult != null) {
      boolean conditionOutcome = conditionResult.getOutcome();
      if (!conditionOutcome) {
        FeatureResult thenFeatureResult = resultFeature.check(context, env);
        if (thenFeatureResult != null) {
          double result = thenFeatureResult.getOutcome();
          featureResult = this.generateResult(result);
        }
      }
    }

    return featureResult;

  }

  public BooleanFeature getCondition() {
    return condition;
  }

  public DoubleFeature getResultFeature() {
    return resultFeature;
  }

  public void setCondition(BooleanFeature condition) {
    this.condition = condition;
  }

  public void setResultFeature(DoubleFeature resultFeature) {
    this.resultFeature = resultFeature;
  }

}