samoa-api/src/main/java/org/apache/samoa/learners/classifiers/trees/FoundNode.java

package org.apache.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%
 */

/**
 * Class that represents the necessary data structure of the node where an instance is routed/filtered through the
 * decision tree model.
 * 
 * @author Arinto Murdopo
 * 
 */
public final class FoundNode implements java.io.Serializable {

  /**
	 * 
	 */
  private static final long serialVersionUID = -637695387934143293L;

  private Node node;
  private final SplitNode parent;
  private final int parentBranch;

  FoundNode(Node node, SplitNode splitNode, int parentBranch) {
    this.node = node;
    this.parent = splitNode;
    this.parentBranch = parentBranch;
  }

  /**
   * Method to get the node where an instance is routed/filtered through the decision tree model for testing and
   * training.
   * 
   * @return The node where the instance is routed/filtered
   */
  Node getNode() {
    return this.node;
  }

  /**
   * Method to set the node where an instance is routed/filtered through the decision tree model for testing and
   * training. The method is expected to be used when the original FoundNode object had null node property.
   * This is to add a reference to a newly established node object.
   * 
   * @param node  the node reference to be inserted
   */
  void setNode(Node node) {
    this.node = node;
  }

  /**
   * Method to get the parent of the node where an instance is routed/filtered through the decision tree model for
   * testing and training
   * 
   * @return The parent of the node
   */
  SplitNode getParent() {
    return this.parent;
  }

  /**
   * Method to get the index of the node (where an instance is routed/filtered through the decision tree model for
   * testing and training) in its parent.
   * 
   * @return The index of the node in its parent node.
   */
  int getParentBranch() {
    return this.parentBranch;
  }

}