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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;

/**
 * Converts a non-string feature to a string feature. If the feature result is
 * null, will return the string "null".
 * 
 * @author Assaf Urieli
 */
public class ToStringAllowNullsFeature extends AbstractCachableFeatureimplements StringFeature {
  private static final String NULL_STRING = "null";

  Feature featureToString;

  public ToStringAllowNullsFeature(Feature feature1) {
    super();
    this.featureToString = feature1;
    this.setName("ToString(" + feature1.getName() + ")");
  }

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

    FeatureResult result1 = featureToString.check(context, env);

    if (result1 != null) {
      featureResult = this.generateResult(result1.getOutcome().toString());
    } else {
      featureResult = this.generateResult(NULL_STRING);
    }
    return featureResult;
  }

  public Feature getFeatureToString() {
    return featureToString;
  }

  public void setFeatureToString(Feature featureToString) {
    this.featureToString = featureToString;
  }

}