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| 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 | +} | |