1 /*
   2  * Copyright (c) 2001, 2005, 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 sun.text;
  27 
  28 import sun.text.normalizer.NormalizerBase;
  29 import sun.text.normalizer.NormalizerImpl;
  30 
  31 public final class ComposedCharIter {
  32     /**
  33      * Constant that indicates the iteration has completed.
  34      * {@link #next} returns this value when there are no more composed characters
  35      * over which to iterate.
  36      */
  37     public static final int DONE = NormalizerBase.DONE;
  38 
  39     //cache the decomps mapping, so the seconde composedcharIter does
  40     //not need to get the data again.
  41     private static int chars[];
  42     private static String decomps[];
  43     private static int decompNum;
  44 
  45     static {
  46         int maxNum = 2000;     //TBD: Unicode 4.0 only has 1926 canoDecomp...
  47         chars = new int[maxNum];
  48         decomps = new String[maxNum];
  49         decompNum = NormalizerImpl.getDecompose(chars, decomps);
  50     }
  51 
  52     /**
  53      * Construct a new <tt>ComposedCharIter</tt>.  The iterator will return
  54      * all Unicode characters with canonical decompositions, excluding Korean
  55      * Hangul characters.
  56      */
  57     public ComposedCharIter() { }
  58 
  59     /**
  60      * Returns the next precomposed Unicode character.
  61      * Repeated calls to <tt>next</tt> return all of the precomposed characters defined
  62      * by Unicode, in ascending order.  After all precomposed characters have
  63      * been returned, {@link #hasNext} will return <tt>false</tt> and further calls
  64      * to <tt>next</tt> will return {@link #DONE}.
  65      */
  66     public int next() {
  67         if (curChar == decompNum - 1) {
  68             return DONE;
  69         }
  70         return chars[++curChar];
  71     }
  72 
  73     /**
  74      * Returns the Unicode decomposition of the current character.
  75      * This method returns the decomposition of the precomposed character most
  76      * recently returned by {@link #next}.  The resulting decomposition is
  77      * affected by the settings of the options passed to the constructor.
  78      */
  79     public String decomposition() {
  80         return decomps[curChar];
  81     }
  82     private int curChar = -1;
  83 }