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Java > Open Source Codes > com > sun > enterprise > diagnostics > report > html > DataTraverser


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23 package com.sun.enterprise.diagnostics.report.html;
24
25 import com.sun.enterprise.diagnostics.Data;
26 import java.util.ArrayList JavaDoc;
27 import java.util.Map JavaDoc;
28 import java.util.HashMap JavaDoc;
29 import java.util.Iterator JavaDoc;
30 /**
31  *
32  * @author mu125243
33  */
34 public class DataTraverser {
35     
36     private Data dataObj;
37     
38     /**
39      * Key of the map is one of the DataTypes. Assumption is there is one
40      * to one relationship between key and its value.
41      */
42     private Map JavaDoc typeToData;
43     
44     /** Creates a new instance of DataTraverser */
45     public DataTraverser(Data dataObj) {
46         this.dataObj = dataObj;
47     }
48     
49     /**
50      * Returns the data object which this traverser is visiting
51      * @return Data
52      */
53     public Data getSource() {
54         return dataObj;
55     }
56     /**
57      * Return child data object of type supplied as a parameter
58      * @param type data object type
59      * @return data object
60      */
61     public Iterator JavaDoc<Data> getData(String JavaDoc type) {
62         if(typeToData == null)
63             traverse();
64         
65         Object JavaDoc obj = typeToData.get(type);
66         if(obj != null) {
67             ArrayList JavaDoc list = (ArrayList JavaDoc)obj;
68             return list.iterator();
69         }
70         return new ArrayList JavaDoc().iterator();
71     }
72     
73     private void traverse() {
74         if(typeToData == null)
75             typeToData = new HashMap JavaDoc(5);
76         Iterator JavaDoc<Data> children = dataObj.getChildren();
77         while(children.hasNext()) {
78             Data child = children.next();
79             ArrayList JavaDoc list = (ArrayList JavaDoc)typeToData.get(child.getType());
80             if (list == null) {
81                 list = new ArrayList JavaDoc(5);
82                 typeToData.put(child.getType(), list);
83             }
84             list.add(child);
85         }
86     }
87 }
88
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