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Java > Open Source Codes > org > cofax > taglibs > HeaderTag


1 /*
2  * HeaderTag is part of the Cofax content management system library.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Please see http://www.cofax.org for contact information and other related informaion.
19  *
20  * $Header: /cvsroot/cofax/cofax/src/org/cofax/taglibs/HeaderTag.java,v 1.3.2.1 2006/12/11 16:27:38 fxrobin Exp $
21  */

22
23 package org.cofax.taglibs;
24
25 import javax.servlet.jsp.*;
26 import javax.servlet.jsp.tagext.*;
27 import java.io.*;
28
29 /**
30  * HeaderTag is a child tag to ExecuteTag, which in turn is a child tag of
31  * PackageTag. A HeaderTag allows access to the first row of a PackageTag's
32  * results to display the beginning of a table for example. This tag is used in
33  * concert with FooterTag, RepeatTag, and NoRowTag.
34  *
35  * Note that this tag returns SKIP_BODY if no rows are returned from the
36  * PackageTag
37  *
38  */

39 public class HeaderTag extends BodyTagSupport {
40
41     PackageTag parent;
42
43     /**
44      * Display the header format if got data return from the packageTag
45      */

46     public int doStartTag() {
47         parent = (PackageTag) findAncestorWithClass(this, PackageTag.class);
48         // check for null, existing row with condition to eval only 1 time
49
if ((parent != null) && (!parent.getNoRows())) {
50             return EVAL_BODY_TAG;
51         } else {
52             return SKIP_BODY;
53         }
54     }
55
56     /**
57      * Eval the header format that normally in pre HTML form or JSP.
58      */

59     public int doAfterBody() throws JspException {
60         BodyContent body = getBodyContent();
61         try {
62             body.writeOut(getPreviousOut());
63         } catch (IOException e) {
64             parent.printMessage("Error in IO body header" + e);
65         }
66         body.clearBody();
67         return SKIP_BODY;
68     }
69
70     /**
71      * Ends this Tag run.
72      */

73     public int doEndTag() {
74         return EVAL_PAGE;
75     }
76
77 } // end HeaderTag
78

79
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