samoa-api/src/main/java/org/apache/samoa/learners/classifiers/rules/common/RuleSplitNode.java

/*
 * 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.rules.common;

import org.apache.samoa.instances.Instance;
import org.apache.samoa.learners.classifiers.trees.SplitNode;
import org.apache.samoa.moa.classifiers.core.conditionaltests.InstanceConditionalTest;
import org.apache.samoa.moa.classifiers.rules.core.Predicate;
import org.apache.samoa.moa.classifiers.rules.core.conditionaltests.NumericAttributeBinaryRulePredicate;

/**
 * Represent a feature of rules (an element of ruleś nodeList).
 * 
 * @author Anh Thu Vu
 * 
 */
public class RuleSplitNode extends SplitNode {

  protected double lastTargetMean;
  protected int operatorObserver;

  private static final long serialVersionUID = 1L;

  public InstanceConditionalTest getSplitTest() {
    return this.splitTest;
  }

  /**
   * Create a new RuleSplitNode
   */
  public RuleSplitNode() {
    this(null, new double[0]);
  }

  public RuleSplitNode(InstanceConditionalTest splitTest, double[] classObservations) {
    super(splitTest, classObservations);
  }

  public RuleSplitNode getACopy() {
    InstanceConditionalTest splitTest = new NumericAttributeBinaryRulePredicate(
        (NumericAttributeBinaryRulePredicate) this.getSplitTest());
    return new RuleSplitNode(splitTest, this.getObservedClassDistribution());
  }

  public boolean evaluate(Instance instance) {
    Predicate predicate = (Predicate) this.splitTest;
    return predicate.evaluate(instance);
  }

}