/*
 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation. Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.text;

import sun.text.normalizer.NormalizerBase;
import sun.text.normalizer.NormalizerImpl;

public final class ComposedCharIter {
 /**
 * Constant that indicates the iteration has completed.
 * {@link #next} returns this value when there are no more composed characters
 * over which to iterate.
 */
 public static final int DONE = NormalizerBase.DONE;

 //cache the decomps mapping, so the seconde composedcharIter does
 //not need to get the data again.
 private static int chars[];
 private static String decomps[];
 private static int decompNum;

 static {
 int maxNum = 2100;
 chars = new int[maxNum];
 decomps = new String[maxNum];
 decompNum = NormalizerImpl.getDecompose(chars, decomps);
 }

 /**
 * Construct a new {@code ComposedCharIter}. The iterator will return
 * all Unicode characters with canonical decompositions, excluding Korean
 * Hangul characters.
 */
 public ComposedCharIter() { }

 /**
 * Returns the next precomposed Unicode character.
 * Repeated calls to {@code next} return all of the precomposed characters defined
 * by Unicode, in ascending order. After all precomposed characters have
 * been returned, {@link #hasNext} will return {@code false} and further calls
 * to {@code next} will return {@link #DONE}.
 */
 public int next() {
 if (curChar == decompNum - 1) {
 return DONE;
 }
 return chars[++curChar];
 }

 /**
 * Returns the Unicode decomposition of the current character.
 * This method returns the decomposition of the precomposed character most
 * recently returned by {@link #next}. The resulting decomposition is
 * affected by the settings of the options passed to the constructor.
 */
 public String decomposition() {
 return decomps[curChar];
 }
 private int curChar = -1;
}