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Java > Open Source Codes > org > netbeans > mdr > util > AbstractLazyList


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.mdr.util;
20
21 import java.util.*;
22
23 /**
24  *
25  * @author Martin Matula
26  * @version
27  */
28 public abstract class AbstractLazyList extends AbstractList {
29     private final Object JavaDoc innerList[];
30
31     public AbstractLazyList() {
32         super();
33         innerList = null;
34     }
35
36     public AbstractLazyList(Collection elements) {
37         super();
38         innerList = elements.toArray();
39     }
40
41     protected abstract Object JavaDoc wrap(Object JavaDoc o);
42     protected abstract boolean isWrapped(Object JavaDoc o);
43
44     public int size() {
45         return innerList.length;
46     }
47     
48     public Object JavaDoc get(int p) {
49         if (!isWrapped(innerList[p])) synchronized (innerList) {
50             if (!isWrapped(innerList[p])) {
51                 innerList[p] = wrap(innerList[p]);
52             }
53         }
54         
55         return innerList[p];
56     }
57 }
58
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