CharacterIteratorWrapper


1   /*
2    *******************************************************************************
3    * Copyright (C) 1996-2004, International Business Machines Corporation and    *
4    * others. All Rights Reserved.                                                *
5    *******************************************************************************
6    */
7   package com.ibm.icu.impl;
8   
9   import java.text.CharacterIterator  ;
10  
11  import com.ibm.icu.text.*;
12  
13  /**
14   * This class is a wrapper around CharacterIterator and implements the 
15   * UCharacterIterator protocol
16   * @author ram
17   */
18  
19  public class CharacterIteratorWrapper extends UCharacterIterator {
20      
21      private CharacterIterator   iterator;
22      
23      
24      public CharacterIteratorWrapper(CharacterIterator   iter){
25          if(iter==null){
26              throw new IllegalArgumentException  ();
27          }
28          iterator     = iter;   
29      }
30  
31      /**
32       * @see UCharacterIterator#current()
33       */
34      public int current() {
35          int c = iterator.current();
36          if(c==CharacterIterator.DONE){
37            return DONE;
38          }
39          return c;
40      }
41  
42      /**
43       * @see UCharacterIterator#getLength()
44       */
45      public int getLength() {
46          return (iterator.getEndIndex() - iterator.getBeginIndex());
47      }
48  
49      /**
50       * @see UCharacterIterator#getIndex()
51       */
52      public int getIndex() {
53          return iterator.getIndex();
54      }
55  
56      /**
57       * @see UCharacterIterator#next()
58       */
59      public int next() {
60          int i = iterator.current();
61          iterator.next();
62          if(i==CharacterIterator.DONE){  
63            return DONE;
64          }
65          return i;
66      }
67  
68      /**
69       * @see UCharacterIterator#previous()
70       */
71      public int previous() {
72          int i = iterator.previous();
73          if(i==CharacterIterator.DONE){
74              return DONE;
75          }
76          return i;
77      }
78  
79      /**
80       * @see UCharacterIterator#setIndex(int)
81       */
82      public void setIndex(int index) {
83          try{
84              iterator.setIndex(index);
85          }catch(IllegalArgumentException   e){
86              throw new IndexOutOfBoundsException  ();
87          }
88      }
89  
90      /**
91       * @see UCharacterIterator#setToLimit()
92       */
93      public void setToLimit() {
94          iterator.setIndex(iterator.getEndIndex());
95      }
96  
97      /**
98       * @see UCharacterIterator#getText(char[])
99       */
100     public int getText(char[] fillIn, int offset){
101         int length =iterator.getEndIndex() - iterator.getBeginIndex(); 
102         int currentIndex = iterator.getIndex();
103         if(offset < 0 || offset + length > fillIn.length){
104             throw new IndexOutOfBoundsException  (Integer.toString(length));
105         }
106     
107         for (char ch = iterator.first(); ch != CharacterIterator.DONE; ch = iterator.next()) {
108             fillIn[offset++] = ch;
109         }
110         iterator.setIndex(currentIndex);
111 
112         return length;
113     }
114 
115     /**
116      * Creates a clone of this iterator.  Clones the underlying character iterator.
117      * @see UCharacterIterator#clone()
118      */
119     public Object   clone(){
120         try {
121             CharacterIteratorWrapper result = (CharacterIteratorWrapper) super.clone();
122             result.iterator = (CharacterIterator  )this.iterator.clone();
123             return result;
124         } catch (CloneNotSupportedException   e) {      
125             return null; // only invoked if bad underlying character iterator
126         }
127     }
128     
129 
130     public int moveIndex(int delta){
131         int length = iterator.getEndIndex() - iterator.getBeginIndex(); 
132         int idx = iterator.getIndex()+delta;
133         
134         if(idx < 0) {
135             idx = 0;
136         } else if(idx > length) {
137             idx = length;
138         }
139         return iterator.setIndex(idx);
140     }
141     
142     /**
143      * @see UCharacterIterator#getCharacterIterator()
144      */
145     public CharacterIterator   getCharacterIterator(){
146         return (CharacterIterator  )iterator.clone();
147     } 
148 }
149
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