01: /*
02: * hgcommons 7
03: * Hammurapi Group Common Library
04: * Copyright (C) 2003 Hammurapi Group
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: *
20: * URL: http://www.hammurapi.biz/hammurapi-biz/ef/xmenu/hammurapi-group/products/products/hgcommons/index.html
21: * e-Mail: support@hammurapi.biz
22: */
23: package biz.hammurapi.util;
24:
25: import java.util.Collection;
26: import java.util.Iterator;
27: import java.util.LinkedList;
28:
29: /**
30: * Takes collection of visitors and piggy-backs them.
31: * Visitor's unwillingnes to navigate further is ignored.
32: * @author Pavel Vlasov
33: * @version $Revision: 1.3 $
34: */
35: public class CompositeVisitor implements PoliteVisitor {
36: private LinkedList visitors;
37:
38: /**
39: *
40: */
41: public CompositeVisitor(Collection visitors) {
42: this .visitors = new LinkedList(visitors);
43: }
44:
45: public boolean visit(Object target) {
46: Iterator it = visitors.iterator();
47: while (it.hasNext()) {
48: ((Visitor) it.next()).visit(target);
49: }
50: return !visitors.isEmpty();
51: }
52:
53: public void leave(Object target) {
54: Iterator it = visitors.iterator();
55: while (it.hasNext()) {
56:
57: Object next = it.next();
58: if (next instanceof PoliteVisitor) {
59: ((PoliteVisitor) next).leave(target);
60: }
61: }
62: }
63: }
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