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16 package org.apache.cocoon.forms.formmodel.tree;
17
18 import java.util.Collection  ;
19 import java.util.HashMap ;
20 import java.util.Iterator ;
21 import java.util.Map ;
22
23
28 public class DefaultTreeModel implements TreeModel {
29
30
33 public static final TreeModel UNSPECIFIED_MODEL = buildUnspecifiedModel();
34
35 private TreeModelHelper helper = new TreeModelHelper(this);
36
37 TreeNode root;
38
39 public interface TreeNode {
40 Collection getChildren();
41
42 boolean isLeaf();
43
44 String getChildKey(Object child);
45
46 Object getChild(String key);
47 }
48
49 public static class DefaultTreeNode implements TreeNode {
50
51 private Object data;
52 private Map children;
53
54 public DefaultTreeNode(Object data) {
55 this.data = data;
56 }
57
58 public DefaultTreeNode(Object data, Map children) {
59 this.data = data;
60 this.children = children;
61 }
62
63 public Object getData() {
64 return this.data;
65 }
66
67 public void add(String key, TreeNode node) {
68 if (this.children == null) {
69 this.children = new HashMap ();
70 }
71 children.put(key, node);
72 }
73
74 public Collection getChildren() {
75 if (this.children == null) {
76 return null;
77 }
78
79 return this.children.values();
80 }
81
82 public boolean isLeaf() {
83 return this.children == null;
84 }
85
86 public String getChildKey(Object child) {
87 Iterator iter = this.children.entrySet().iterator();
88 while(iter.hasNext()) {
89 Map.Entry entry = (Map.Entry )iter.next();
90 if (child.equals(entry.getValue())) {
91 return (String )entry.getKey();
92 }
93 }
94 return null;
95 }
96
97 public Object getChild(String key) {
98 return this.children.get(key);
99 }
100 }
101
102 public DefaultTreeModel(TreeNode root) {
103 this.root = root;
104 }
105
106 public Object getRoot() {
107 return this.root;
108 }
109
110 public Collection getChildren(Object parent) {
111 return ((TreeNode)parent).getChildren();
112 }
113
114 public boolean isLeaf(Object node) {
115 return ((TreeNode)node).isLeaf();
116 }
117
118 public String getChildKey(Object parent, Object child) {
119 return ((TreeNode)parent).getChildKey(child);
120 }
121
122 public Object getChild(Object parent, String key) {
123 return ((TreeNode)parent).getChild(key);
124 }
125
126 public Object getNode(TreePath path) {
127 return helper.getNode(path);
128 }
129
130 public void addTreeModelListener(TreeModelListener l) {
131 helper.addTreeModelListener(l);
132 }
133
134 public void removeTreeModelListener(TreeModelListener l) {
135 helper.removeTreeModelListener(l);
136 }
137
138 private static TreeModel buildUnspecifiedModel() {
139 DefaultTreeNode root = new DefaultTreeNode("This tree has no model.");
140 DefaultTreeNode parent = new DefaultTreeNode("Tree model should be defined...");
141 root.add("explanation", parent);
142 parent.add("1", new DefaultTreeNode("in the form definition using <fd:tree-model>"));
143 parent.add("2", new DefaultTreeNode("by the application using flowscript, event listeners, etc."));
144 return new DefaultTreeModel(root);
145 }
146
147
150 public static class Sample extends DefaultTreeModel {
151 public Sample() {
152 super(new DefaultTreeNode("root"));
153 DefaultTreeNode root = (DefaultTreeNode)getRoot();
154
155 DefaultTreeNode parent;
156
157 parent = new DefaultTreeNode("Colors");
158 root.add("colors", parent);
159 parent.add("blue", new DefaultTreeNode("Blue"));
160 parent.add("violet", new DefaultTreeNode("Violet"));
161 parent.add("red", new DefaultTreeNode("Red"));
162 parent.add("yellow", new DefaultTreeNode("Yellow"));
163
164 parent = new DefaultTreeNode("Sports");
165 root.add("sports", parent);
166 parent.add("basketball", new DefaultTreeNode("Basketball"));
167 parent.add("soccer", new DefaultTreeNode("Soccer"));
168 parent.add("football", new DefaultTreeNode("Football"));
169 parent.add("hockey", new DefaultTreeNode("Hockey"));
170
171 parent = new DefaultTreeNode("Food");
172 root.add("food", parent);
173 parent.add("hotdogs", new DefaultTreeNode("Hot Dogs"));
174 parent.add("pizza", new DefaultTreeNode("Pizza"));
175 parent.add("ravioli", new DefaultTreeNode("Ravioli"));
176 parent.add("bananas", new DefaultTreeNode("Bananas"));
177 }
178 }
179 }
180 |
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