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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.math.optimization;
19  
20  import java.io.Serializable;
21  
22  import org.apache.commons.math.analysis.MultivariateVectorialFunction;
23  
24  /** 
25   * This class holds a point and the vectorial value of an objective function at this point.
26   * <p>This is a simple immutable container.</p>
27   * @see RealPointValuePair
28   * @see MultivariateVectorialFunction
29   * @version $Revision: 758049 $ $Date: 2009-03-24 18:09:34 -0400 (Tue, 24 Mar 2009) $
30   * @since 2.0
31   */
32  public class VectorialPointValuePair implements Serializable {
33  
34      /** Serializable version identifier. */
35      private static final long serialVersionUID = 1003888396256744753L;
36  
37      /** Point coordinates. */
38      private final double[] point;
39  
40      /** Vectorial value of the objective function at the point. */
41      private final double[] value;
42  
43      /** Build a point/objective function value pair.
44       * @param point point coordinates (the built instance will store
45       * a copy of the array, not the array passed as argument)
46       * @param value value of an objective function at the point
47       */
48      public VectorialPointValuePair(final double[] point, final double[] value) {
49          this.point = point.clone();
50          this.value = value.clone();
51      }
52  
53      /** Build a point/objective function value pair.
54       * @param point point coordinates (the built instance will store
55       * a copy of the array, not the array passed as argument)
56       * @param value value of an objective function at the point
57       * @param copyArray if true, the input arrays will be copied, otherwise
58       * they will be referenced
59       */
60      public VectorialPointValuePair(final double[] point, final double[] value,
61                                     final boolean copyArray) {
62          this.point = copyArray ? point.clone() : point;
63          this.value = copyArray ? value.clone() : value;
64      }
65  
66      /** Get the point.
67       * @return a copy of the stored point
68       */
69      public double[] getPoint() {
70          return point.clone();
71      }
72  
73      /** Get a reference to the point.
74       * <p>This method is provided as a convenience to avoid copying
75       * the array, the elements of the array should <em>not</em> be modified.</p>
76       * @return a reference to the internal array storing the point
77       */
78      public double[] getPointRef() {
79          return point;
80      }
81  
82      /** Get the value of the objective function.
83       * @return a copy of the stored value of the objective function
84       */
85      public double[] getValue() {
86          return value.clone();
87      }
88  
89      /** Get a reference to the value of the objective function.
90       * <p>This method is provided as a convenience to avoid copying
91       * the array, the elements of the array should <em>not</em> be modified.</p>
92       * @return a reference to the internal array storing the value of the objective function
93       */
94      public double[] getValueRef() {
95          return value;
96      }
97  
98  }