Source code: jbreport/core/Document.java
1 /*
2 * $Id: Document.java,v 1.1 2000/08/31 13:53:17 grantfin Exp $
3 *
4 * jbReport - A reporting library for Java
5 * Copyright (C) 2000 Grant Finnemore <grantfin@users.sourceforge.net>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 package jbreport.core;
22
23 import java.util.Iterator;
24
25 import jbreport.ReportException;
26
27 /**
28 * Represents a complete document that can be rendered to produce a valid
29 * output result. This would be the equivalent of an html page, acrobat
30 * document, etc.
31 *
32 * @author Grant Finnemore
33 * @version $Revision: 1.1 $
34 */
35 class Document extends ReportSectionImpl {
36
37 /** Has the data been loaded already? */
38 private boolean dataLoaded = false;
39
40 //
41 // Constructors
42 //
43
44 //
45 // Methods overloaded from AbstractReportElement
46 //
47
48 public void accept(ReportVisitor visitor, ReportVisitorState state)
49 throws ReportException {
50 visitor.visitDocument(this, state);
51 }
52
53 public void loadData() throws ReportException {
54 if(dataLoaded) {
55 throw new IllegalStateException("The loadData() method cannot be "
56 + "called more than once.");
57 }
58 dataLoaded = true;
59 // Use the pre-order iterator, as the structure might change during the
60 // iteration. Using any other types of iterator might not ensure that
61 // we visit all the nodes in the tree.
62 for(Iterator it = preOrderIterator(); it.hasNext();) {
63 AbstractReportElement elem = (AbstractReportElement)it.next();
64 elem.preLoadData();
65 }
66 super.loadData();
67 }
68 }