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 
  26 package com.sun.corba.se.spi.ior;
  27 
  28 import java.util.List;
  29 import java.util.ArrayList;
  30 import java.util.Iterator;
  31 
  32 import com.sun.corba.se.impl.ior.FreezableList ;
  33 
  34 import com.sun.corba.se.spi.ior.TaggedComponent ;
  35 import 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  */
  43 public 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 }