/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.samoa.learners.classifiers.trees;

import org.apache.samoa.instances.Instance;

/**
 * Abstract class that represents a learning node
 * 
 * @author Arinto Murdopo
 * 
 */
public abstract class LearningNode extends Node {

  private static final long serialVersionUID = 7157319356146764960L;

  protected LearningNode(double[] classObservation) {
    super(classObservation);
  }

  /**
   * Method to process the instance for learning
   *
   * @param inst
   *          The processed instance
   * @param proc
   *          The model aggregator processor where this learning node exists
   */
  public abstract void learnFromInstance(Instance inst, ModelAggregatorProcessor proc);

  @Override
  protected boolean isLeaf() {
    return true;
  }

  @Override
  public FoundNode filterInstanceToLeaf(Instance inst, SplitNode parent,
      int parentBranch) {
    return new FoundNode(this, parent, parentBranch);
  }
}