IdentifiableContainerBase.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.corba.se.spi.ior;
27
28import java.util.List;
29import java.util.ArrayList;
30import java.util.Iterator;
31
32import com.sun.corba.se.impl.ior.FreezableList ;
33
34import com.sun.corba.se.spi.ior.TaggedComponent ;
35import com.sun.corba.se.spi.ior.Identifiable ;
36
37/** Convenience class for defining objects that contain lists of Identifiables.
38 * Mainly implements iteratorById.  Also note that the constructor creates the
39 * list, which here is always an ArrayList, as this is much more efficient overall
40 * for short lists.
41 * @author  Ken Cavanaugh
42 */
43public class IdentifiableContainerBase extends FreezableList
44{
45    /** Create this class with an empty list of identifiables.
46     * The current implementation uses an ArrayList.
47     */
48    public IdentifiableContainerBase()
49    {
50        super( new ArrayList() ) ;
51    }
52
53    /** Return an iterator which iterates over all contained Identifiables
54     * with type given by id.
55     */
56    public Iterator iteratorById( final int id)
57    {
58        return new Iterator() {
59            Iterator iter = IdentifiableContainerBase.this.iterator() ;
60            Object current = advance() ;
61
62            private Object advance()
63            {
64                while (iter.hasNext()) {
65                    Identifiable ide = (Identifiable)(iter.next()) ;
66                    if (ide.getId() == id)
67                        return ide ;
68                }
69
70                return null ;
71            }
72
73            public boolean hasNext()
74            {
75                return current != null ;
76            }
77
78            public Object next()
79            {
80                Object result = current ;
81                current = advance() ;
82                return result ;
83            }
84
85            public void remove()
86            {
87                iter.remove() ;
88            }
89        } ;
90    }
91}
92