| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | } |