1 package org.apache.velocity.runtime.parser.node; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import org.apache.velocity.context.InternalContextAdapter; 23 import org.apache.velocity.runtime.parser.Parser; 24 25 /** 26 * Handles number addition of nodes.<br><br> 27 * 28 * Please look at the Parser.jjt file which is 29 * what controls the generation of this class. 30 * 31 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a> 32 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a> 33 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> 34 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> 35 * @version $Id: ASTAddNode.java 712887 2008-11-11 00:27:50Z nbubna $ 36 */ 37 public class ASTAddNode extends ASTMathNode 38 { 39 /** 40 * @param id 41 */ 42 public ASTAddNode(int id) 43 { 44 super(id); 45 } 46 47 /** 48 * @param p 49 * @param id 50 */ 51 public ASTAddNode(Parser p, int id) 52 { 53 super(p, id); 54 } 55 56 //@Override 57 protected Object handleSpecial(Object left, Object right, InternalContextAdapter context) 58 { 59 /* 60 * shall we try for strings? 61 */ 62 if (left instanceof String || right instanceof String) 63 { 64 if (left == null) 65 { 66 left = jjtGetChild(0).literal(); 67 } 68 else if (right == null) 69 { 70 right = jjtGetChild(1).literal(); 71 } 72 return left.toString().concat(right.toString()); 73 } 74 return null; 75 } 76 77 public Number perform(Number left, Number right, InternalContextAdapter context) 78 { 79 return MathUtils.add(left, right); 80 } 81 82 } 83 84 85 86