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Java > Open Source Codes > org > dbforms > taglib > HasErrorTag


1 /*
2  * $Header: /cvsroot/jdbforms/dbforms/src/org/dbforms/taglib/HasErrorTag.java,v 1.1 2005/02/20 10:27:44 hkollmann Exp $
3  * $Revision: 1.1 $
4  * $Date: 2005/02/20 10:27:44 $
5  *
6  * DbForms - a Rapid Application Development Framework
7  * Copyright (C) 2001 Joachim Peer <joepeer@excite.com>
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23
24 /*
25  * the idea for this class was taken from the class ErrorsTag-class of the Apache Struts Project
26  */
27 package org.dbforms.taglib;
28
29 import org.dbforms.util.Util;
30
31 import java.util.Vector JavaDoc;
32
33 import javax.servlet.jsp.JspException JavaDoc;
34 import javax.servlet.jsp.PageContext JavaDoc;
35 import javax.servlet.jsp.tagext.BodyTagSupport JavaDoc;
36
37
38
39 /**
40  * Custom tag that evaluates its body if an Error has occured.
41  *
42  * <p>
43  * Based on ErrorTag and IsWebEvent tag, allows for conditional coding if an
44  * error event occured.
45  * </p>
46  *
47  * @author Neal Katz
48  */
49 public class HasErrorTag extends BodyTagSupport JavaDoc
50    implements javax.servlet.jsp.tagext.TryCatchFinally JavaDoc {
51    // private String messagePrefix;
52 private String JavaDoc name = "errors";
53    private String JavaDoc value = "true";
54
55    /**
56     * DOCUMENT ME!
57     *
58     * @param name DOCUMENT ME!
59     */
60    public void setName(String JavaDoc name) {
61       this.name = name;
62    }
63
64
65    /**
66     * DOCUMENT ME!
67     *
68     * @return DOCUMENT ME!
69     */
70    public String JavaDoc getName() {
71       return (this.name);
72    }
73
74
75    /**
76     * DOCUMENT ME!
77     *
78     * @param string
79     */
80    public void setValue(String JavaDoc string) {
81       value = string;
82    }
83
84
85    /**
86     * DOCUMENT ME!
87     *
88     * @return
89     */
90    public String JavaDoc getValue() {
91       return value;
92    }
93
94
95    /**
96     * DOCUMENT ME!
97     *
98     * @param t DOCUMENT ME!
99     *
100     * @throws Throwable DOCUMENT ME!
101     */
102    public void doCatch(Throwable JavaDoc t) throws Throwable JavaDoc {
103       throw t;
104    }
105
106
107    /**
108     * DOCUMENT ME!
109     */
110    public void doFinally() {
111       name = "errors";
112       value = "true";
113    }
114
115
116    // ------------------------------------------------------- Public Methods
117
118    /**
119     * Render the specified error messages if there are any.
120     *
121     * @return DOCUMENT ME!
122     *
123     * @exception JspException if a JSP exception has occurred
124     */
125    public int doStartTag() throws JspException JavaDoc {
126       Vector JavaDoc originalErrors = (Vector JavaDoc) pageContext.getAttribute(getName(),
127                                                                             PageContext.REQUEST_SCOPE);
128       boolean haveError = false;
129
130       haveError = (((originalErrors != null) && (originalErrors.size() > 0)));
131
132       return (Util.getTrue(value) == haveError) ? EVAL_BODY_INCLUDE
133                                                 : SKIP_BODY;
134    }
135 }
136
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