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