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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 true if a feature is null, false otherwise.
 * 
 * @author Assaf Urieli
 *
 */
public class IsNullFeature extends AbstractCachableFeatureimplements BooleanFeature {
  Feature testFeature;

  public IsNullFeature(Feature testFeature) {
    super();
    this.testFeature = testFeature;
    this.setName("IsNull(" + testFeature.getName() + ")");
  }

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

    FeatureResult result1 = testFeature.check(context, env);
    featureResult = this.generateResult(result1 == null);
    return featureResult;
  }

  public Feature getTestFeature() {
    return testFeature;
  }

  public void setTestFeature(Feature testFeature) {
    this.testFeature = testFeature;
  }

}