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 }