| 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 | import java.io.IOException; |
| 20 | import java.io.Writer; |
| 21 | |
| 22 | import org.apache.velocity.context.InternalContextAdapter; |
| 23 | import org.apache.velocity.runtime.RuntimeConstants; |
| 24 | import org.apache.velocity.runtime.parser.Parser; |
| 25 | |
| 26 | import org.apache.velocity.exception.MethodInvocationException; |
| 27 | |
| 28 | import org.apache.velocity.app.event.EventCartridge; |
| 29 | |
| 30 | /** |
| 31 | * Node for the #set directive |
| 32 | * |
| 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: ASTSetDirective.java,v 1.22.4.1 2004/03/03 23:22:59 geirm Exp $ |
| 36 | */ |
| 37 | public class ASTSetDirective extends SimpleNode |
| 38 | { |
| 39 | private String leftReference = ""; |
| 40 | private Node right; |
| 41 | private ASTReference left; |
| 42 | boolean blather = false; |
| 43 | |
| 44 | public ASTSetDirective(int id) |
| 45 | { |
| 46 | super(id); |
| 47 | } |
| 48 | |
| 49 | public ASTSetDirective(Parser p, int id) |
| 50 | { |
| 51 | super(p, id); |
| 52 | } |
| 53 | |
| 54 | /** Accept the visitor. **/ |
| 55 | public Object jjtAccept(ParserVisitor visitor, Object data) |
| 56 | { |
| 57 | return visitor.visit(this, data); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * simple init. We can get the RHS and LHS as the the tree structure is static |
| 62 | */ |
| 63 | public Object init(InternalContextAdapter context, Object data) |
| 64 | throws Exception |
| 65 | { |
| 66 | /* |
| 67 | * init the tree correctly |
| 68 | */ |
| 69 | |
| 70 | super.init( context, data ); |
| 71 | |
| 72 | right = getRightHandSide(); |
| 73 | left = getLeftHandSide(); |
| 74 | |
| 75 | blather = rsvc.getBoolean(RuntimeConstants.RUNTIME_LOG_REFERENCE_LOG_INVALID, true); |
| 76 | |
| 77 | /* |
| 78 | * grab this now. No need to redo each time |
| 79 | */ |
| 80 | leftReference = left.getFirstToken().image.substring(1); |
| 81 | |
| 82 | return data; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * puts the value of the RHS into the context under the key of the LHS |
| 87 | */ |
| 88 | public boolean render( InternalContextAdapter context, Writer writer) |
| 89 | throws IOException, MethodInvocationException |
| 90 | { |
| 91 | /* |
| 92 | * get the RHS node, and it's value |
| 93 | */ |
| 94 | |
| 95 | Object value = right.value(context); |
| 96 | |
| 97 | /* |
| 98 | * it's an error if we don't have a value of some sort |
| 99 | */ |
| 100 | |
| 101 | if ( value == null) |
| 102 | { |
| 103 | /* |
| 104 | * first, are we supposed to say anything anyway? |
| 105 | */ |
| 106 | if(blather) |
| 107 | { |
| 108 | EventCartridge ec = context.getEventCartridge(); |
| 109 | |
| 110 | boolean doit = true; |
| 111 | |
| 112 | /* |
| 113 | * if we have an EventCartridge... |
| 114 | */ |
| 115 | if (ec != null) |
| 116 | { |
| 117 | doit = ec.shouldLogOnNullSet( left.literal(), right.literal() ); |
| 118 | } |
| 119 | |
| 120 | if (doit) |
| 121 | { |
| 122 | rsvc.error("RHS of #set statement is null. Context will not be modified. " |
| 123 | + context.getCurrentTemplateName() + " [line " + getLine() |
| 124 | + ", column " + getColumn() + "]"); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * if the LHS is simple, just punch the value into the context |
| 133 | * otherwise, use the setValue() method do to it. |
| 134 | * Maybe we should always use setValue() |
| 135 | */ |
| 136 | |
| 137 | if (left.jjtGetNumChildren() == 0) |
| 138 | { |
| 139 | context.put( leftReference, value); |
| 140 | } |
| 141 | else |
| 142 | { |
| 143 | left.setValue(context, value); |
| 144 | } |
| 145 | |
| 146 | return true; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * returns the ASTReference that is the LHS of the set statememt |
| 151 | */ |
| 152 | private ASTReference getLeftHandSide() |
| 153 | { |
| 154 | return (ASTReference) jjtGetChild(0); |
| 155 | |
| 156 | // return (ASTReference) jjtGetChild(0).jjtGetChild(0).jjtGetChild(0); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * returns the RHS Node of the set statement |
| 161 | */ |
| 162 | private Node getRightHandSide() |
| 163 | { |
| 164 | return jjtGetChild(1); |
| 165 | // return jjtGetChild(0).jjtGetChild(0).jjtGetChild(1).jjtGetChild(0); |
| 166 | } |
| 167 | } |