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:
24: package biz.hammurapi.util;
25:
26: import java.util.Collection;
27: import java.util.LinkedList;
28:
29: import biz.hammurapi.RuntimeException;
30:
31: /**
32: * @author Pavel Vlasov
33: * @version $Revision: 1.3 $
34: */
35: public abstract class AbstractSearchable implements Visitable,
36: Searchable {
37:
38: public Object find(final Acceptor acceptor) {
39: /**
40: * Doesn't indicate problem, but carries found object.
41: */
42: class ReturnException extends RuntimeException {
43: /**
44: * Comment for <code>serialVersionUID</code>
45: */
46: private static final long serialVersionUID = 358344825019870509L;
47: Object found;
48:
49: ReturnException(Object found) {
50: this .found = found;
51: }
52: }
53:
54: try {
55: accept(new Visitor() {
56: public boolean visit(Object target) {
57: if (acceptor.accept(target)) {
58: throw new ReturnException(target);
59: }
60: return true;
61: }
62: });
63: return null;
64: } catch (ReturnException e) {
65: return e.found;
66: }
67: }
68:
69: public Collection findAll(final Acceptor acceptor) {
70: final Collection ret = new LinkedList();
71: accept(new Visitor() {
72: public boolean visit(Object target) {
73: if (acceptor.accept(target)) {
74: ret.add(target);
75: }
76: return true;
77: }
78: });
79: return ret;
80: }
81: }
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