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Java > Open Source Codes > org > tigris > scarab > util > IteratorWithSize


1 package org.tigris.scarab.util;
2
3 /* ================================================================
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48
49 import java.util.Iterator JavaDoc;
50 import java.util.NoSuchElementException JavaDoc;
51
52 public interface IteratorWithSize extends Iterator JavaDoc
53 {
54     public static final IteratorWithSize EMPTY = new EmptyIteratorWithSize();
55
56     public int size();
57 }
58
59 class EmptyIteratorWithSize implements IteratorWithSize
60 {
61     public boolean hasNext()
62     {
63         return false;
64     }
65     
66     public Object JavaDoc next()
67     {
68         throw new NoSuchElementException JavaDoc("This is an empty list."); //EXCEPTION
69 }
70     
71     public void remove()
72     {
73         throw new IllegalStateException JavaDoc("next() will throw exception, so it is "
74                                         + "not possible to call this method."); //EXCEPTION
75 }
76     
77     public int size()
78     {
79         return 0;
80     }
81 }
82
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