opennlp-ml/src/main/java/org/apache/opennlp/ml/model/MutableContext.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.opennlp.ml.model;

import java.util.Arrays;

/**
 * Class used to store parameters or expected values associated with this context which
 * can be updated or assigned. 
 */
public class MutableContext extends Context {

  /**
   * Creates a new parameters object with the specified parameters associated with the specified
   * outcome pattern.
   * 
   * @param outcomePattern Array of outcomes for which parameters exists for this context.
   * @param parameters Parameters for the outcomes specified.
   */
  public MutableContext(int[] outcomePattern, double[] parameters) {
    super(outcomePattern, parameters);
  }
  
  /**
   * Assigns the parameter or expected value at the specified outcomeIndex the specified value. 
   * 
   * @param outcomeIndex The index of the parameter or expected value to be updated. 
   * @param value The value to be assigned.
   */
  public void setParameter(int outcomeIndex, double value) {
    parameters[outcomeIndex]=value;
  }
  
  /**
   * Updated the parameter or expected value at the specified outcomeIndex by adding the specified value to its current value.
   * 
   * @param outcomeIndex The index of the parameter or expected value to be updated.
   * @param value The value to be added.
   */
  public void updateParameter(int outcomeIndex, double value) {
    parameters[outcomeIndex]+=value;
  }
  
  public boolean contains(int outcome) {
    return(Arrays.binarySearch(outcomes,outcome) >= 0);
  }
}