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Java > Open Source Codes > com > ibm > icu > impl > UCharArrayIterator


1 /**
2 *******************************************************************************
3 * Copyright (C) 1996-2004, International Business Machines Corporation and *
4 * others. All Rights Reserved. *
5 *******************************************************************************
6 */
7
8 package com.ibm.icu.impl;
9
10 import com.ibm.icu.text.*;
11
12
13 /**
14  * @author Doug Felt
15  *
16  */
17
18 public final class UCharArrayIterator extends UCharacterIterator {
19     private final char[] text;
20     private final int start;
21     private final int limit;
22     private int pos;
23
24     public UCharArrayIterator(char[] text, int start, int limit) {
25         if (start < 0 || limit > text.length || start > limit) {
26             throw new IllegalArgumentException JavaDoc("start: " + start + " or limit: "
27                                                + limit + " out of range [0, "
28                                                + text.length + ")");
29         }
30         this.text = text;
31         this.start = start;
32         this.limit = limit;
33
34         this.pos = start;
35     }
36
37     public int current() {
38         return pos < limit ? text[pos] : DONE;
39     }
40
41     public int getLength() {
42         return limit - start;
43     }
44
45     public int getIndex() {
46         return pos - start;
47     }
48
49     public int next() {
50         return pos < limit ? text[pos++] : DONE;
51     }
52
53     public int previous() {
54         return pos > start ? text[--pos] : DONE;
55     }
56
57     public void setIndex(int index) {
58         if (index < 0 || index > limit - start) {
59             throw new IndexOutOfBoundsException JavaDoc("index: " + index +
60                                                 " out of range [0, "
61                                                 + (limit - start) + ")");
62         }
63         pos = start + index;
64     }
65
66     public int getText(char[] fillIn, int offset) {
67         int len = limit - start;
68         System.arraycopy(text, start, fillIn, offset, len);
69         return len;
70     }
71
72     /**
73      * Creates a copy of this iterator, does not clone the underlying
74      * <code>Replaceable</code>object
75      * @return copy of this iterator
76      */
77     public Object JavaDoc clone(){
78         try {
79           return super.clone();
80         } catch (CloneNotSupportedException JavaDoc e) {
81             return null; // never invoked
82 }
83     }
84 }
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