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 java.io.IOException; 23 import java.io.Writer; 24 25 import org.apache.velocity.context.InternalContextAdapter; 26 import org.apache.velocity.exception.MethodInvocationException; 27 import org.apache.velocity.exception.ParseErrorException; 28 import org.apache.velocity.exception.ResourceNotFoundException; 29 import org.apache.velocity.runtime.parser.Parser; 30 31 /** 32 * This class is responsible for handling the ElseIf VTL control statement. 33 * 34 * Please look at the Parser.jjt file which is 35 * what controls the generation of this class. 36 * 37 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> 38 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> 39 * @version $Id: ASTElseIfStatement.java 517553 2007-03-13 06:09:58Z wglass $ 40 */ 41 public class ASTElseIfStatement extends SimpleNode 42 { 43 /** 44 * @param id 45 */ 46 public ASTElseIfStatement(int id) 47 { 48 super(id); 49 } 50 51 /** 52 * @param p 53 * @param id 54 */ 55 public ASTElseIfStatement(Parser p, int id) 56 { 57 super(p, id); 58 } 59 60 /** 61 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object) 62 */ 63 public Object jjtAccept(ParserVisitor visitor, Object data) 64 { 65 return visitor.visit(this, data); 66 } 67 68 /** 69 * An ASTElseStatement is true if the expression 70 * it contains evaluates to true. Expressions know 71 * how to evaluate themselves, so we do that 72 * here and return the value back to ASTIfStatement 73 * where this node was originally asked to evaluate 74 * itself. 75 * @param context 76 * @return True if all childs are true. 77 * @throws MethodInvocationException 78 */ 79 public boolean evaluate ( InternalContextAdapter context) 80 throws MethodInvocationException 81 { 82 return jjtGetChild(0).evaluate(context); 83 } 84 85 /** 86 * @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer) 87 */ 88 public boolean render( InternalContextAdapter context, Writer writer) 89 throws IOException,MethodInvocationException, 90 ResourceNotFoundException, ParseErrorException 91 { 92 return jjtGetChild(1).render( context, writer ); 93 } 94 }