1 /**
2 * ========================================
3 * JFreeReport : a free Java report library
4 * ========================================
5 *
6 * Project Info: http://www.jfree.org/jfreereport/index.html
7 * Project Lead: Thomas Morgner (taquera@sherito.org);
8 *
9 * (C) Copyright 2000-2004, by Simba Management Limited and Contributors.
10 *
11 * This library is free software; you can redistribute it and/or modify it under the terms
12 * of the GNU Lesser General Public License as published by the Free Software Foundation;
13 * either version 2.1 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
16 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17 * See the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License along with this
20 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
21 * Boston, MA 02111-1307, USA.
22 *
23 * ------------------------------
24 * HideArticleDetailsFunction.java
25 * ------------------------------
26 * (C)opyright 2004, by Thomas Morgner and Contributors.
27 *
28 * Original Author: Thomas Morgner;
29 * Contributor(s): David Gilbert (for Simba Management Limited);
30 *
31 * $Id: HideArticleDetailsFunction.java,v 1.1.2.2 2004/10/13 18:42:15 taqua Exp $
32 *
33 * Changes
34 * -------------------------
35 * 26.03.2004 : Initial version
36 *
37 */
38
39 package org.jfree.report.demo.invoice;
40
41 import org.jfree.report.Element;
42 import org.jfree.report.event.ReportEvent;
43 import org.jfree.report.function.AbstractFunction;
44 import org.jfree.report.function.FunctionUtilities;
45 import org.jfree.report.util.Log;
46
47 public class HideArticleDetailsFunction extends AbstractFunction
48 {
49 /**
50 * Creates an unnamed function. Make sure the name of the function is set using {@link
51 * #setName} before the function is added to the report's function collection.
52 */
53 public HideArticleDetailsFunction ()
54 {
55 }
56
57 /**
58 * Receives notification that a row of data is being processed.
59 *
60 * @param event the event.
61 */
62 public void itemsAdvanced (final ReportEvent event)
63 {
64 final Element e = FunctionUtilities.findElement
65 (event.getReport().getItemBand(), "details");
66 if (e == null)
67 {
68 Log.warn ("HideArticleDetailsFunction: No 'detail' element found in the itemband.");
69 return;
70 }
71
72 // now hide the element if there are no details ...
73 e.setVisible(event.getDataRow().get("article.details") != null);
74 }
75
76 /**
77 * Return the current expression value. <P> The value depends (obviously) on the
78 * expression implementation.
79 *
80 * @return the value of the function.
81 */
82 public Object getValue ()
83 {
84 // we don't have to return a value, as this function does no computation
85 return null;
86 }
87 }
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