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Apache Ignite® is a Distributed Database For High-Performance Computing With In-Memory Speed.

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/*
 * 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.ignite.ml.tree;

/**
 * Decision tree conditional (non-leaf) node.
 */
public class DecisionTreeConditionalNode implements DecisionTreeNode {
    /** */
    private static final long serialVersionUID = 981630737007982172L;

    /** Column of the value to be tested. */
    private final int col;

    /** Threshold. */
    private final double threshold;

    /** Node that will be used in case tested value is greater then threshold. */
    private final DecisionTreeNode thenNode;

    /** Node that will be used in case tested value is not greater then threshold. */
    private final DecisionTreeNode elseNode;

    /**
     * Constructs a new instance of decision tree conditional node.
     *
     * @param col Column of the value to be tested.
     * @param threshold Threshold.
     * @param thenNode Node that will be used in case tested value is greater then threshold.
     * @param elseNode Node that will be used in case tested value is not greater then threshold.
     */
    DecisionTreeConditionalNode(int col, double threshold, DecisionTreeNode thenNode, DecisionTreeNode elseNode) {
        this.col = col;
        this.threshold = threshold;
        this.thenNode = thenNode;
        this.elseNode = elseNode;
    }

    /** {@inheritDoc} */
    @Override public Double apply(double[] features) {
        return features[col] > threshold ? thenNode.apply(features) : elseNode.apply(features);
    }

    /** */
    public int getCol() {
        return col;
    }

    /** */
    public double getThreshold() {
        return threshold;
    }

    /** */
    public DecisionTreeNode getThenNode() {
        return thenNode;
    }

    /** */
    public DecisionTreeNode getElseNode() {
        return elseNode;
    }
}