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 import org.apache.velocity.runtime.parser.ParserVisitor;
31
32 /**
33 * This class is responsible for handling the ElseIf VTL control statement.
34 *
35 * Please look at the Parser.jjt file which is
36 * what controls the generation of this class.
37 *
38 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
39 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
40 * @version $Id: ASTElseIfStatement.java 463298 2006-10-12 16:10:32Z henning $
41 */
42 public class ASTElseIfStatement extends SimpleNode
43 {
44 /**
45 * @param id
46 */
47 public ASTElseIfStatement(int id)
48 {
49 super(id);
50 }
51
52 /**
53 * @param p
54 * @param id
55 */
56 public ASTElseIfStatement(Parser p, int id)
57 {
58 super(p, id);
59 }
60
61 /**
62 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.ParserVisitor, java.lang.Object)
63 */
64 public Object jjtAccept(ParserVisitor visitor, Object data)
65 {
66 return visitor.visit(this, data);
67 }
68
69 /**
70 * An ASTElseStatement is true if the expression
71 * it contains evaluates to true. Expressions know
72 * how to evaluate themselves, so we do that
73 * here and return the value back to ASTIfStatement
74 * where this node was originally asked to evaluate
75 * itself.
76 * @param context
77 * @return True if all childs are true.
78 * @throws MethodInvocationException
79 */
80 public boolean evaluate ( InternalContextAdapter context)
81 throws MethodInvocationException
82 {
83 return jjtGetChild(0).evaluate(context);
84 }
85
86 /**
87 * @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer)
88 */
89 public boolean render( InternalContextAdapter context, Writer writer)
90 throws IOException,MethodInvocationException,
91 ResourceNotFoundException, ParseErrorException
92 {
93 return jjtGetChild(1).render( context, writer );
94 }
95 }