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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;

/**
 * Merges two or more string features by concatenating their results and adding
 * a | in between. Includes the string "null" if any of the results is null.
 * 
 * @author Assaf Urieli
 *
 */
public class ConcatenateWithNullsFeature extends AbstractCachableFeatureimplements StringFeature {
  private static final String NULL_RESULT = "null";

  StringFeature[] stringFeatures;

  @SafeVarargs
  public ConcatenateWithNullsFeature(StringFeature... stringFeatures) {
    super();
    this.stringFeatures = stringFeatures;
    String name = "Concat(";
    boolean firstFeature = true;
    for (StringFeature stringFeature : stringFeatures) {
      if (!firstFeature)
        name += ",";
      name += stringFeature.getName();
      firstFeature = false;
    }
    name += ")";
    this.setName(name);
  }

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

    StringBuilder sb = new StringBuilder();
    boolean firstFeature = true;
    for (StringFeature stringFeature : stringFeatures) {
      if (!firstFeature)
        sb.append("|");
      FeatureResult result = stringFeature.check(context, env);
      if (result == null)
        sb.append(NULL_RESULT);
      else
        sb.append(result.getOutcome());
      firstFeature = false;
    }

    featureResult = this.generateResult(sb.toString());
    return featureResult;
  }

  public StringFeature[] getStringFeatures() {
    return stringFeatures;
  }

}