SubtractFunction.java revision 56ed4167b942ec265f9cee70ac4d71d10b3835ce
1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.clearsilver.jsilver.functions.operators;
18
19import com.google.clearsilver.jsilver.functions.NonEscapingFunction;
20import com.google.clearsilver.jsilver.values.Value;
21import static com.google.clearsilver.jsilver.values.Value.literalConstant;
22
23/**
24 * X - Y.
25 */
26public class SubtractFunction extends NonEscapingFunction {
27
28  public Value execute(Value... args) {
29    if (args.length == 1) {
30      Value value = args[0];
31      return literalConstant(0 - value.asNumber(), value);
32    } else {
33      Value left = args[0];
34      Value right = args[1];
35      return literalConstant(left.asNumber() - right.asNumber(), left, right);
36    }
37  }
38
39}
40