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Java > Open Source Codes > com > jsptags > navigation > pager > JumpTagSupport


1 /*
2  * Pager Tag Library
3  *
4  * Copyright (C) 2002 James Klicman <james@jsptags.com>
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  */

20
21 package com.jsptags.navigation.pager;
22
23 import javax.servlet.jsp.*;
24 import javax.servlet.jsp.tagext.*;
25
26 public abstract class JumpTagSupport extends PageTagSupport {
27
28     static final String JavaDoc
29         CURRENT = "current",
30         INDEXED = "indexed";
31
32     private String JavaDoc unless = null;
33
34     public final void setUnless(String JavaDoc value) throws JspException {
35         if (!(value == null || CURRENT.equals(value) || INDEXED.equals(value)))
36         {
37             throw new JspTagException("value for attribute \"unless\" " +
38                 "must be either \"current\" or \"indexed\".");
39         }
40         unless = value;
41     }
42
43     public final String JavaDoc getUnless() {
44         return unless;
45     }
46
47     public int doStartTag() throws JspException {
48         super.doStartTag();
49
50         int jumpPage = getJumpPage();
51
52         if (CURRENT.equals(unless)) {
53             if (jumpPage == pagerTag.getPageNumber())
54                 return SKIP_BODY;
55         } else if (INDEXED.equals(unless)) {
56             int firstPage = pagerTag.getFirstIndexPage();
57             int lastPage = pagerTag.getLastIndexPage(firstPage);
58
59             if (jumpPage >= firstPage && jumpPage <= lastPage)
60                 return SKIP_BODY;
61         }
62
63         setPageAttributes(jumpPage);
64
65         return EVAL_BODY_INCLUDE;
66     }
67
68     public void release() {
69         unless = null;
70         super.release();
71     }
72
73     protected abstract int getJumpPage();
74 }
75
76 /* vim:set ts=4 sw=4: */
77
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