package com.yahoo.labs.samoa.learners.classifiers.trees;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import com.yahoo.labs.samoa.instances.Instance;

/**
 * Class that represents inactive learning node. Inactive learning node is a node which only keeps track of the observed
 * class distribution. It does not store the statistic for splitting the node.
 * 
 * @author Arinto Murdopo
 * 
 */
final class InactiveLearningNode extends LearningNode {

  /**
	 * 
	 */
  private static final long serialVersionUID = -814552382883472302L;

  InactiveLearningNode(double[] initialClassObservation) {
    super(initialClassObservation);
  }

  @Override
  void learnFromInstance(Instance inst, ModelAggregatorProcessor proc) {
    this.observedClassDistribution.addToValue(
        (int) inst.classValue(), inst.weight());
  }

  @Override
  double[] getClassVotes(Instance inst, ModelAggregatorProcessor map) {
    return this.observedClassDistribution.getArrayCopy();
  }

}