1/*
2 * Copyright (c) 2001, 2015, 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
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23 * questions.
24 */
25
26package sun.text;
27
28import sun.text.normalizer.NormalizerBase;
29import sun.text.normalizer.NormalizerImpl;
30
31public 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 = 2100;
47        chars = new int[maxNum];
48        decomps = new String[maxNum];
49        decompNum = NormalizerImpl.getDecompose(chars, decomps);
50    }
51
52    /**
53     * Construct a new {@code ComposedCharIter}.  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 {@code next} 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 {@code false} and further calls
64     * to {@code next} 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}
84