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Java > Open Source Codes > org > apache > velocity > runtime > parser > node > ASTElseIfStatement


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.Writer JavaDoc;
20 import java.io.IOException JavaDoc;
21
22 import org.apache.velocity.context.InternalContextAdapter;
23 import org.apache.velocity.runtime.parser.*;
24
25 import org.apache.velocity.exception.MethodInvocationException;
26 import org.apache.velocity.exception.ParseErrorException;
27 import org.apache.velocity.exception.ResourceNotFoundException;
28
29 /**
30  * This class is responsible for handling the ElseIf VTL control statement.
31  *
32  * Please look at the Parser.jjt file which is
33  * what controls the generation of this class.
34  *
35  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
36  * @author <a HREF="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
37  * @version $Id: ASTElseIfStatement.java,v 1.9.8.1 2004/03/03 23:22:58 geirm Exp $
38 */
39 public class ASTElseIfStatement extends SimpleNode
40 {
41     public ASTElseIfStatement(int id)
42     {
43         super(id);
44     }
45
46     public ASTElseIfStatement(Parser p, int id)
47     {
48         super(p, id);
49     }
50
51     /** Accept the visitor. **/
52     public Object JavaDoc jjtAccept(ParserVisitor visitor, Object JavaDoc data)
53     {
54         return visitor.visit(this, data);
55     }
56
57     /**
58      * An ASTElseStatement is true if the expression
59      * it contains evaluates to true. Expressions know
60      * how to evaluate themselves, so we do that
61      * here and return the value back to ASTIfStatement
62      * where this node was originally asked to evaluate
63      * itself.
64      */
65     public boolean evaluate ( InternalContextAdapter context)
66         throws MethodInvocationException
67     {
68         return jjtGetChild(0).evaluate(context);
69     }
70
71     /**
72      * renders the block
73      */
74     public boolean render( InternalContextAdapter context, Writer JavaDoc writer)
75         throws IOException JavaDoc,MethodInvocationException,
76             ResourceNotFoundException, ParseErrorException
77     {
78         return jjtGetChild(1).render( context, writer );
79     }
80 }
81
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