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.Collections;
26: import java.util.HashMap;
27: import java.util.LinkedList;
28: import java.util.List;
29: import java.util.Map;
30:
31: /**
32: * Simple class to build tree structures
33: * @author Pavel Vlasov
34: * @version $Revision: 1.4 $
35: */
36: public class TreeNode extends VisitableBase implements Attributable {
37: private TreeNode parent;
38:
39: public TreeNode() {
40: super ();
41: }
42:
43: /* (non-Javadoc)
44: * @see biz.hammurapi.util.Visitable#accept(biz.hammurapi.util.Visitor)
45: */
46: protected void acceptChildren(Visitor visitor) {
47: childrenVisitable.accept(visitor);
48: }
49:
50: private Map attributes = new HashMap();
51:
52: public void setAttribute(Object key, Object value) {
53: if (value == null) {
54: attributes.remove(key);
55: } else {
56: attributes.put(key, value);
57: }
58: }
59:
60: public Object getAttribute(Object key) {
61: return attributes.get(key);
62: }
63:
64: private List children = new LinkedList();
65: private Visitable childrenVisitable = new CollectionVisitable(
66: children, false);
67:
68: public List getChildren() {
69: return Collections.unmodifiableList(children);
70: }
71:
72: public void addChild(Object child) {
73: children.add(child);
74: if (child instanceof TreeNode) {
75: ((TreeNode) child).parent = this ;
76: }
77: }
78:
79: public boolean hasAttribute(String name) {
80: return attributes.containsKey(name);
81: }
82:
83: /**
84: * @return Returns the parent.
85: */
86: public TreeNode getParent() {
87: return parent;
88: }
89:
90: public Object removeAttribute(Object key) {
91: return attributes.remove(key);
92: }
93:
94: }
|