package org.apache.samoa.moa.classifiers.core;

/*
 * #%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 org.apache.samoa.moa.AbstractMOAObject;
import org.apache.samoa.moa.classifiers.core.conditionaltests.InstanceConditionalTest;

/**
 * Class for computing attribute split suggestions given a split test.
 * 
 * @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
 * @version $Revision: 7 $
 */
public class AttributeSplitSuggestion extends AbstractMOAObject implements Comparable<AttributeSplitSuggestion> {

  private static final long serialVersionUID = 1L;

  public InstanceConditionalTest splitTest;

  public double[][] resultingClassDistributions;

  public double merit;

  public AttributeSplitSuggestion() {
    merit = Double.NEGATIVE_INFINITY;
  }

  public AttributeSplitSuggestion(InstanceConditionalTest splitTest,
      double[][] resultingClassDistributions, double merit) {
    this.splitTest = splitTest;
    this.resultingClassDistributions = resultingClassDistributions.clone();
    this.merit = merit;
  }

  public int numSplits() {
    return this.resultingClassDistributions.length;
  }

  public double[] resultingClassDistributionFromSplit(int splitIndex) {
    return this.resultingClassDistributions[splitIndex].clone();
  }

  @Override
  public int compareTo(AttributeSplitSuggestion comp) {
    return Double.compare(this.merit, comp.merit);
  }

  @Override
  public void getDescription(StringBuilder sb, int indent) {
    // do nothing
  }
}