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


1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4  * Copyright 2000-2002,2004 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 org.apache.velocity.runtime.parser.Parser;
20 import org.apache.velocity.runtime.parser.Token;
21 import org.apache.velocity.context.InternalContextAdapter;
22 import org.apache.velocity.exception.ResourceNotFoundException;
23 import org.apache.velocity.exception.ParseErrorException;
24 import org.apache.velocity.exception.MethodInvocationException;
25
26 import java.io.IOException JavaDoc;
27 import java.io.Writer JavaDoc;
28
29 /**
30  * Represents all comments...
31  *
32  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
33  * @version $Id: ASTComment.java,v 1.5.4.1 2004/03/03 23:22:58 geirm Exp $
34  */
35 public class ASTComment extends SimpleNode
36 {
37     private static final char[] ZILCH = "".toCharArray();
38
39     private char[] carr;
40
41     public ASTComment(int id)
42     {
43         super(id);
44     }
45
46     public ASTComment(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      * We need to make sure we catch any of the dreaded MORE tokens.
59      */
60     public Object JavaDoc init(InternalContextAdapter context, Object JavaDoc data)
61             throws Exception JavaDoc
62     {
63         Token t = getFirstToken();
64
65         int loc1 = t.image.indexOf("##");
66         int loc2 = t.image.indexOf("#*");
67
68         if (loc1 == -1 && loc2 == -1)
69         {
70             carr = ZILCH;
71         }
72         else
73         {
74             carr = t.image.substring(0, (loc1 == -1) ? loc2 : loc1).toCharArray();
75         }
76
77         return data;
78     }
79
80     public boolean render( InternalContextAdapter context, Writer JavaDoc writer)
81         throws IOException JavaDoc, MethodInvocationException, ParseErrorException, ResourceNotFoundException
82     {
83         writer.write(carr);
84
85         return true;
86     }
87
88 }
89
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