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


1 /*
2  * NoRowTag 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/NoRowTag.java,v 1.3.2.1 2006/12/11 16:27:39 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  * NoRowTag is a child tag to ExecuteTag, which in turn is a child tag of
31  * PackageTag. A NoRowTag evaluages only if no rows are returned from the
32  * PackageTag call. This tag is used in concert with FooterTag, RepeatTag, and
33  * HeaderTag.
34  */

35 public class NoRowTag extends BodyTagSupport {
36
37     PackageTag parent;
38
39     /**
40      * Display the noRow message if no data return from the packageTag
41      */

42     public int doStartTag() throws JspException {
43
44         parent = (PackageTag) findAncestorWithClass(this, PackageTag.class);
45
46         // check for existing row
47
if ((parent != null) && (parent.getNoRows())) {
48
49             return EVAL_BODY_TAG;
50         } else {
51             return SKIP_BODY;
52         }
53     }
54
55     /**
56      * Eval the "noRow message" format that normally in pre HTML form or JSP.
57      */

58     public int doAfterBody() throws JspException {
59
60         BodyContent body = getBodyContent();
61         try {
62             body.writeOut(getPreviousOut());
63         } catch (IOException e) {
64             parent.printMessage("Error in IO body noRow" + 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 NoRowTag
78

79
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