| 1 | package org.apache.velocity.runtime.parser.node; |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2000-2001,2004 The Apache Software Foundation. |
| 5 | * |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | /** |
| 21 | * Please look at the Parser.jjt file which is |
| 22 | * what controls the generation of this class. |
| 23 | * |
| 24 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
| 25 | * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> |
| 26 | * @version $Id: ASTIfStatement.java,v 1.9.8.1 2004/03/03 23:22:58 geirm Exp $ |
| 27 | */ |
| 28 | |
| 29 | |
| 30 | import java.io.Writer; |
| 31 | import java.io.IOException; |
| 32 | |
| 33 | import org.apache.velocity.context.InternalContextAdapter; |
| 34 | import org.apache.velocity.runtime.parser.*; |
| 35 | |
| 36 | import org.apache.velocity.exception.MethodInvocationException; |
| 37 | import org.apache.velocity.exception.ParseErrorException; |
| 38 | import org.apache.velocity.exception.ResourceNotFoundException; |
| 39 | |
| 40 | |
| 41 | public class ASTIfStatement extends SimpleNode |
| 42 | { |
| 43 | public ASTIfStatement(int id) |
| 44 | { |
| 45 | super(id); |
| 46 | } |
| 47 | |
| 48 | public ASTIfStatement(Parser p, int id) |
| 49 | { |
| 50 | super(p, id); |
| 51 | } |
| 52 | |
| 53 | /** Accept the visitor. **/ |
| 54 | public Object jjtAccept(ParserVisitor visitor, Object data) |
| 55 | { |
| 56 | return visitor.visit(this, data); |
| 57 | } |
| 58 | |
| 59 | public boolean render( InternalContextAdapter context, Writer writer) |
| 60 | throws IOException,MethodInvocationException, |
| 61 | ResourceNotFoundException, ParseErrorException |
| 62 | { |
| 63 | /* |
| 64 | * Check if the #if(expression) construct evaluates to true: |
| 65 | * if so render and leave immediately because there |
| 66 | * is nothing left to do! |
| 67 | */ |
| 68 | if (jjtGetChild(0).evaluate(context)) |
| 69 | { |
| 70 | jjtGetChild(1).render(context, writer); |
| 71 | return true; |
| 72 | } |
| 73 | |
| 74 | int totalNodes = jjtGetNumChildren(); |
| 75 | |
| 76 | /* |
| 77 | * Now check the remaining nodes left in the |
| 78 | * if construct. The nodes are either elseif |
| 79 | * nodes or else nodes. Each of these node |
| 80 | * types knows how to evaluate themselves. If |
| 81 | * a node evaluates to true then the node will |
| 82 | * render itself and this method will return |
| 83 | * as there is nothing left to do. |
| 84 | */ |
| 85 | for (int i = 2; i < totalNodes; i++) |
| 86 | { |
| 87 | if (jjtGetChild(i).evaluate(context)) |
| 88 | { |
| 89 | jjtGetChild(i).render(context, writer); |
| 90 | return true; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * This is reached when an ASTIfStatement |
| 96 | * consists of an if/elseif sequence where |
| 97 | * none of the nodes evaluate to true. |
| 98 | */ |
| 99 | return true; |
| 100 | } |
| 101 | |
| 102 | public void process( InternalContextAdapter context, ParserVisitor visitor) |
| 103 | { |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | |
| 108 | |
| 109 | |
| 110 | |
| 111 | |