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Java > Open Source Codes > org > htmlparser > scanners > BulletScanner


1 // $Header: /home/cvs/jakarta-jmeter/src/htmlparser/org/htmlparser/scanners/BulletScanner.java,v 1.2 2004/02/10 13:41:09 woolfel Exp $
2 /*
3  * ====================================================================
4  * Copyright 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
20 // The developers of JMeter and Apache are greatful to the developers
21 // of HTMLParser for giving Apache Software Foundation a non-exclusive
22 // license. The performance benefits of HTMLParser are clear and the
23 // users of JMeter will benefit from the hard work the HTMLParser
24 // team. For detailed information about HTMLParser, the project is
25 // hosted on sourceforge at http://htmlparser.sourceforge.net/.
26 //
27 // HTMLParser was originally created by Somik Raha in 2000. Since then
28 // a healthy community of users has formed and helped refine the
29 // design so that it is able to tackle the difficult task of parsing
30 // dirty HTML. Derrick Oswald is the current lead developer and was kind
31 // enough to assist JMeter.
32
33 package org.htmlparser.scanners;
34
35 import java.util.Stack JavaDoc;
36
37 import org.htmlparser.tags.Bullet;
38 import org.htmlparser.tags.Tag;
39 import org.htmlparser.tags.data.CompositeTagData;
40 import org.htmlparser.tags.data.TagData;
41 import org.htmlparser.util.ParserException;
42
43 /**
44  * This scanner is created by BulletListScanner. It shares a stack to maintain the parent-child relationship
45  * with BulletListScanner. The rules implemented are :<br>
46  * [1] A &lt;ul&gt; can have &lt;li&gt; under it<br>
47  * [2] A &lt;li&gt; can have &lt;ul&gt; under it<br>
48  * [3] A &lt;li&gt; cannot have &lt;li&gt; under it<br>
49  * <p>
50  * These rules are implemented easily through the shared stack.
51  */
52 public class BulletScanner extends CompositeTagScanner
53 {
54     private static final String JavaDoc[] MATCH_STRING = { "LI" };
55     private final static String JavaDoc ENDERS[] = { "BODY", "HTML" };
56     private final static String JavaDoc END_TAG_ENDERS[] = { "UL" };
57     private Stack JavaDoc ulli;
58
59     public BulletScanner(Stack JavaDoc ulli)
60     {
61         this("", ulli);
62     }
63
64     public BulletScanner(String JavaDoc filter, Stack JavaDoc ulli)
65     {
66         super(filter, MATCH_STRING, ENDERS, END_TAG_ENDERS, false);
67         this.ulli = ulli;
68     }
69
70     public Tag createTag(TagData tagData, CompositeTagData compositeTagData)
71         throws ParserException
72     {
73         return new Bullet(tagData, compositeTagData);
74     }
75
76     public String JavaDoc[] getID()
77     {
78         return MATCH_STRING;
79     }
80
81     /**
82      * This is the logic that decides when a bullet tag can be allowed
83      */
84     public boolean shouldCreateEndTagAndExit()
85     {
86         if (ulli.size() == 0)
87             return false;
88         CompositeTagScanner parentScanner = (CompositeTagScanner) ulli.peek();
89         if (parentScanner == this)
90         {
91             ulli.pop();
92             return true;
93         }
94         else
95             return false;
96     }
97
98     public void beforeScanningStarts()
99     {
100         ulli.push(this);
101     }
102
103 }
104
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