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Java > Open Source Codes > org > netbeans > lib > jmi > query > QueryIterator


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.lib.jmi.query;
20
21 import java.util.Iterator JavaDoc;
22
23
24 /** Default implementation of the iterator, does not allowe the remove operation
25  *
26  * @author Petr Hrebejk
27  */
28 abstract class QueryIterator implements Iterator JavaDoc {
29
30     abstract public boolean hasNext();
31
32     abstract public Object JavaDoc next();
33
34     /** Allways throws an UnsupportedOperationException as the Queries are
35      * read only.
36      */
37     public void remove() {
38         throw new UnsupportedOperationException JavaDoc( "MDR queries cannot be modified" );
39     }
40
41     // Innerclasses ------------------------------------------------------------
42
43     /** Delegates to underlying iterator
44     */
45     static class Delegate extends QueryIterator {
46         
47         /** Contains the underlying iterator. Subclasses can ask it directly.
48         */
49         protected final Iterator JavaDoc ITERATOR;
50
51         public Delegate(Iterator JavaDoc iterator) {
52             super();
53             this.ITERATOR = iterator;
54         }
55
56         public boolean hasNext() {
57             return ITERATOR.hasNext();
58         }
59
60         public Object JavaDoc next() {
61             return ITERATOR.next();
62         }
63         
64     }
65     
66 }
67
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