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Java > Open Source Codes > org > apache > ldap > server > db > gui > ASTNode


1 /*
2  * Copyright 2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.ldap.server.db.gui;
18
19
20 import org.apache.ldap.common.filter.BranchNode;
21 import org.apache.ldap.common.filter.ExprNode;
22
23 import javax.swing.tree.TreeNode JavaDoc;
24 import java.util.ArrayList JavaDoc;
25 import java.util.Collections JavaDoc;
26 import java.util.Enumeration JavaDoc;
27
28
29 /**
30  * A node representing an entry.
31  *
32  * @author <a HREF="mailto:dev@directory.apache.org">Apache Directory Project</a>
33  * @version $Rev: 169198 $
34  */
35 public class ASTNode implements TreeNode JavaDoc
36 {
37     private final ASTNode parent;
38     private final ExprNode exprNode;
39     private final ArrayList JavaDoc children;
40
41
42     public ASTNode( ASTNode parent, ExprNode exprNode )
43     {
44         this.children = new ArrayList JavaDoc(2);
45         this.exprNode = exprNode;
46
47         if( parent == null )
48         {
49             this.parent = this;
50         }
51         else
52         {
53             this.parent = parent;
54         }
55
56         try
57         {
58             if( exprNode.isLeaf() )
59             {
60                 return;
61             }
62
63             BranchNode branch = ( BranchNode ) exprNode;
64             ArrayList JavaDoc exprNodes = branch.getChildren();
65             for ( int ii = 0; ii < exprNodes.size(); ii++ )
66             {
67                 ExprNode child = ( ExprNode ) exprNodes.get(ii);
68                 children.add( new ASTNode( this, child ) );
69             }
70         }
71         catch( Exception JavaDoc e )
72         {
73             e.printStackTrace();
74         }
75     }
76
77
78     public Enumeration JavaDoc children()
79     {
80         return Collections.enumeration( children );
81     }
82
83
84     public boolean getAllowsChildren()
85     {
86         return !exprNode.isLeaf();
87     }
88
89
90     public TreeNode JavaDoc getChildAt( int childIndex )
91     {
92         return ( TreeNode JavaDoc ) children.get( childIndex );
93     }
94
95
96     public int getChildCount()
97     {
98         return children.size();
99     }
100
101
102     public int getIndex( TreeNode JavaDoc child )
103     {
104         return children.indexOf( child );
105     }
106
107
108     public TreeNode JavaDoc getParent()
109     {
110         return parent;
111     }
112
113
114     public boolean isLeaf()
115     {
116         return children.size() <= 0;
117     }
118
119
120     public String JavaDoc toString()
121     {
122         return exprNode.toString();
123     }
124
125
126     public ExprNode getExprNode()
127     {
128         return exprNode;
129     }
130 }
131
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