100 lines
3.4 KiB
Java
100 lines
3.4 KiB
Java
/*
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* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.text;
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/**
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* SupplementaryCharacterData is an SMI-private class which was written for
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* RuleBasedBreakIterator and BreakDictionary.
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*/
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public final class SupplementaryCharacterData implements Cloneable {
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/**
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* A token used as a character-category value to identify ignore characters
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*/
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private static final byte IGNORE = -1;
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/**
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* An array for supplementary characters and values.
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* Lower one byte is used to keep a byte-value.
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* Upper three bytes are used to keep the first supplementary character
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* which has the value. The value is also valid for the following
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* supplementary characters until the next supplementary character in
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* the array <code>dataTable</code>.
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* For example, if the value of <code>dataTable[2]</code> is
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* <code>0x01000123</code> and the value of <code>dataTable[3]</code> is
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* <code>0x01000567</code>, supplementary characters from
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* <code>0x10001</code> to <code>0x10004</code> has the value
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* <code>0x23</code>. And, <code>getValue(0x10003)</code> returns the value.
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*/
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private int[] dataTable;
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/**
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* Creates a new SupplementaryCharacterData object with the given table.
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*/
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public SupplementaryCharacterData(int[] table) {
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dataTable = table;
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}
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/**
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* Returns a corresponding value for the given supplementary code-point.
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*/
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public int getValue(int index) {
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// Index should be a valid supplementary character.
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assert index >= Character.MIN_SUPPLEMENTARY_CODE_POINT &&
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index <= Character.MAX_CODE_POINT :
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"Invalid code point:" + Integer.toHexString(index);
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int i = 0;
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int j = dataTable.length - 1;
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int k;
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for (;;) {
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k = (i + j) / 2;
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int start = dataTable[k] >> 8;
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int end = dataTable[k+1] >> 8;
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if (index < start) {
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j = k;
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} else if (index > (end-1)) {
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i = k;
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} else {
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int v = dataTable[k] & 0xFF;
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return (v == 0xFF) ? IGNORE : v;
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}
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}
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}
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/**
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* Returns the data array.
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*/
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public int[] getArray() {
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return dataTable;
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}
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}
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