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.runtime.parser.Parser; 23 import org.apache.velocity.runtime.parser.ParserVisitor; 24 import org.apache.velocity.context.InternalContextAdapter; 25 26 import org.apache.velocity.exception.MethodInvocationException; 27 28 /** 29 * Please look at the Parser.jjt file which is 30 * what controls the generation of this class. 31 * 32 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> 33 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> 34 * @version $Id: ASTOrNode.java 463298 2006-10-12 16:10:32Z henning $ 35 */ 36 public class ASTOrNode extends SimpleNode 37 { 38 /** 39 * @param id 40 */ 41 public ASTOrNode(int id) 42 { 43 super(id); 44 } 45 46 /** 47 * @param p 48 * @param id 49 */ 50 public ASTOrNode(Parser p, int id) 51 { 52 super(p, id); 53 } 54 55 /** 56 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.ParserVisitor, java.lang.Object) 57 */ 58 public Object jjtAccept(ParserVisitor visitor, Object data) 59 { 60 return visitor.visit(this, data); 61 } 62 63 /** 64 * Returns the value of the expression. 65 * Since the value of the expression is simply the boolean 66 * result of evaluate(), lets return that. 67 * @param context 68 * @return The Expression value. 69 * @throws MethodInvocationException 70 */ 71 public Object value(InternalContextAdapter context ) 72 throws MethodInvocationException 73 { 74 // TODO: JDK 1.4+ -> valueOf() 75 return new Boolean(evaluate(context)); 76 } 77 78 /** 79 * the logical or : 80 * the rule : 81 * left || null -> left 82 * null || right -> right 83 * null || null -> false 84 * left || right -> left || right 85 * @param context 86 * @return The evaluation result. 87 * @throws MethodInvocationException 88 */ 89 public boolean evaluate( InternalContextAdapter context) 90 throws MethodInvocationException 91 { 92 Node left = jjtGetChild(0); 93 Node right = jjtGetChild(1); 94 95 /* 96 * if the left is not null and true, then true 97 */ 98 99 if (left != null && left.evaluate( context ) ) 100 return true; 101 102 /* 103 * same for right 104 */ 105 106 if ( right != null && right.evaluate( context ) ) 107 return true; 108 109 return false; 110 } 111 } 112 113 114 115 116