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Java > Open Source Codes > org > apache > commons > math > function > simple > Subtract


1 /*
2  *
3  * Copyright (c) 2003-2004 The Apache Software Foundation. All rights reserved.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
6  * use this file except in compliance with the License. You may obtain a copy
7  * 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, WITHOUT
13  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
14  * License for the specific language governing permissions and limitations
15  * under the License.
16  *
17  */
18 package org.apache.commons.math.function.simple;
19
20 import java.io.Serializable JavaDoc;
21
22 import org.apache.commons.math.function.EvaluationContext;
23 import org.apache.commons.math.function.Evaluation;
24 import org.apache.commons.math.function.EvaluationException;
25
26 /**
27
28
29  */
30 public class Subtract implements Evaluation, Serializable JavaDoc {
31
32     private Evaluation left;
33
34     private Evaluation right;
35
36     public void setLeftOperand(Evaluation left) {
37         this.left = left;
38     }
39
40     public void setRightOperand(Evaluation right) {
41         this.right = right;
42     }
43
44     public Evaluation evaluate(EvaluationContext context) throws EvaluationException {
45         return context.evaluate(
46             context.doubleValue(left) - context.doubleValue(right)
47         );
48     }
49     
50     public String JavaDoc toString() {
51         return "Subtract";
52     }
53 }
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