author | sherman |
Tue, 30 Aug 2011 11:53:11 -0700 | |
changeset 10419 | 12c063b39232 |
parent 5506 | 202f599c92aa |
child 13583 | dc0017b1a452 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2006, 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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/* |
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* (C) Copyright Taligent, Inc. 1996-1998 - All Rights Reserved |
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* (C) Copyright IBM Corp. 1996-1998 - All Rights Reserved |
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* |
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* The original version of this source code and documentation is copyrighted |
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* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These |
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* materials are provided under terms of a License Agreement between Taligent |
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* and Sun. This technology is protected by multiple US and International |
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* patents. This notice and attribution to Taligent may not be removed. |
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* Taligent is a registered trademark of Taligent, Inc. |
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* |
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*/ |
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package java.text; |
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import java.text.spi.CollatorProvider; |
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import java.util.Locale; |
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import java.util.MissingResourceException; |
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import java.util.ResourceBundle; |
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import java.util.spi.LocaleServiceProvider; |
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import sun.misc.SoftCache; |
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import sun.util.resources.LocaleData; |
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import sun.util.LocaleServiceProviderPool; |
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/** |
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* The <code>Collator</code> class performs locale-sensitive |
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* <code>String</code> comparison. You use this class to build |
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* searching and sorting routines for natural language text. |
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* |
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* <p> |
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* <code>Collator</code> is an abstract base class. Subclasses |
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* implement specific collation strategies. One subclass, |
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* <code>RuleBasedCollator</code>, is currently provided with |
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* the Java Platform and is applicable to a wide set of languages. Other |
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* subclasses may be created to handle more specialized needs. |
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* |
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* <p> |
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* Like other locale-sensitive classes, you can use the static |
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* factory method, <code>getInstance</code>, to obtain the appropriate |
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* <code>Collator</code> object for a given locale. You will only need |
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* to look at the subclasses of <code>Collator</code> if you need |
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* to understand the details of a particular collation strategy or |
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* if you need to modify that strategy. |
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* |
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* <p> |
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* The following example shows how to compare two strings using |
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* the <code>Collator</code> for the default locale. |
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* <blockquote> |
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* <pre> |
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* // Compare two strings in the default locale |
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* Collator myCollator = Collator.getInstance(); |
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* if( myCollator.compare("abc", "ABC") < 0 ) |
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* System.out.println("abc is less than ABC"); |
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* else |
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* System.out.println("abc is greater than or equal to ABC"); |
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* </pre> |
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* </blockquote> |
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* |
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* <p> |
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* You can set a <code>Collator</code>'s <em>strength</em> property |
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* to determine the level of difference considered significant in |
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* comparisons. Four strengths are provided: <code>PRIMARY</code>, |
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* <code>SECONDARY</code>, <code>TERTIARY</code>, and <code>IDENTICAL</code>. |
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* The exact assignment of strengths to language features is |
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* locale dependant. For example, in Czech, "e" and "f" are considered |
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* primary differences, while "e" and "ě" are secondary differences, |
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* "e" and "E" are tertiary differences and "e" and "e" are identical. |
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* The following shows how both case and accents could be ignored for |
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* US English. |
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* <blockquote> |
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* <pre> |
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* //Get the Collator for US English and set its strength to PRIMARY |
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* Collator usCollator = Collator.getInstance(Locale.US); |
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* usCollator.setStrength(Collator.PRIMARY); |
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* if( usCollator.compare("abc", "ABC") == 0 ) { |
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* System.out.println("Strings are equivalent"); |
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* } |
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* </pre> |
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* </blockquote> |
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* <p> |
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* For comparing <code>String</code>s exactly once, the <code>compare</code> |
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* method provides the best performance. When sorting a list of |
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* <code>String</code>s however, it is generally necessary to compare each |
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* <code>String</code> multiple times. In this case, <code>CollationKey</code>s |
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* provide better performance. The <code>CollationKey</code> class converts |
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* a <code>String</code> to a series of bits that can be compared bitwise |
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* against other <code>CollationKey</code>s. A <code>CollationKey</code> is |
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* created by a <code>Collator</code> object for a given <code>String</code>. |
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* <br> |
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* <strong>Note:</strong> <code>CollationKey</code>s from different |
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* <code>Collator</code>s can not be compared. See the class description |
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* for {@link CollationKey} |
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* for an example using <code>CollationKey</code>s. |
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* |
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* @see RuleBasedCollator |
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* @see CollationKey |
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* @see CollationElementIterator |
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* @see Locale |
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* @author Helena Shih, Laura Werner, Richard Gillam |
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*/ |
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public abstract class Collator |
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implements java.util.Comparator<Object>, Cloneable |
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{ |
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/** |
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* Collator strength value. When set, only PRIMARY differences are |
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* considered significant during comparison. The assignment of strengths |
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* to language features is locale dependant. A common example is for |
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* different base letters ("a" vs "b") to be considered a PRIMARY difference. |
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* @see java.text.Collator#setStrength |
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* @see java.text.Collator#getStrength |
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*/ |
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public final static int PRIMARY = 0; |
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/** |
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* Collator strength value. When set, only SECONDARY and above differences are |
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* considered significant during comparison. The assignment of strengths |
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* to language features is locale dependant. A common example is for |
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* different accented forms of the same base letter ("a" vs "\u00E4") to be |
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* considered a SECONDARY difference. |
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* @see java.text.Collator#setStrength |
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* @see java.text.Collator#getStrength |
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*/ |
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public final static int SECONDARY = 1; |
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/** |
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* Collator strength value. When set, only TERTIARY and above differences are |
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* considered significant during comparison. The assignment of strengths |
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* to language features is locale dependant. A common example is for |
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* case differences ("a" vs "A") to be considered a TERTIARY difference. |
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* @see java.text.Collator#setStrength |
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* @see java.text.Collator#getStrength |
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*/ |
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public final static int TERTIARY = 2; |
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/** |
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* Collator strength value. When set, all differences are |
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* considered significant during comparison. The assignment of strengths |
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* to language features is locale dependant. A common example is for control |
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* characters ("\u0001" vs "\u0002") to be considered equal at the |
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* PRIMARY, SECONDARY, and TERTIARY levels but different at the IDENTICAL |
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* level. Additionally, differences between pre-composed accents such as |
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* "\u00C0" (A-grave) and combining accents such as "A\u0300" |
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* (A, combining-grave) will be considered significant at the IDENTICAL |
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* level if decomposition is set to NO_DECOMPOSITION. |
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*/ |
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public final static int IDENTICAL = 3; |
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/** |
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* Decomposition mode value. With NO_DECOMPOSITION |
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* set, accented characters will not be decomposed for collation. This |
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* is the default setting and provides the fastest collation but |
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* will only produce correct results for languages that do not use accents. |
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* @see java.text.Collator#getDecomposition |
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* @see java.text.Collator#setDecomposition |
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*/ |
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public final static int NO_DECOMPOSITION = 0; |
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/** |
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* Decomposition mode value. With CANONICAL_DECOMPOSITION |
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* set, characters that are canonical variants according to Unicode |
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* standard will be decomposed for collation. This should be used to get |
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* correct collation of accented characters. |
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* <p> |
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* CANONICAL_DECOMPOSITION corresponds to Normalization Form D as |
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* described in |
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* <a href="http://www.unicode.org/unicode/reports/tr15/tr15-23.html">Unicode |
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* Technical Report #15</a>. |
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* @see java.text.Collator#getDecomposition |
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* @see java.text.Collator#setDecomposition |
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*/ |
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public final static int CANONICAL_DECOMPOSITION = 1; |
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/** |
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* Decomposition mode value. With FULL_DECOMPOSITION |
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* set, both Unicode canonical variants and Unicode compatibility variants |
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* will be decomposed for collation. This causes not only accented |
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* characters to be collated, but also characters that have special formats |
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* to be collated with their norminal form. For example, the half-width and |
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* full-width ASCII and Katakana characters are then collated together. |
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* FULL_DECOMPOSITION is the most complete and therefore the slowest |
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* decomposition mode. |
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* <p> |
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* FULL_DECOMPOSITION corresponds to Normalization Form KD as |
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* described in |
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* <a href="http://www.unicode.org/unicode/reports/tr15/tr15-23.html">Unicode |
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* Technical Report #15</a>. |
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* @see java.text.Collator#getDecomposition |
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* @see java.text.Collator#setDecomposition |
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*/ |
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public final static int FULL_DECOMPOSITION = 2; |
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/** |
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* Gets the Collator for the current default locale. |
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* The default locale is determined by java.util.Locale.getDefault. |
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* @return the Collator for the default locale.(for example, en_US) |
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* @see java.util.Locale#getDefault |
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*/ |
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public static synchronized Collator getInstance() { |
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return getInstance(Locale.getDefault()); |
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} |
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/** |
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* Gets the Collator for the desired locale. |
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* @param desiredLocale the desired locale. |
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* @return the Collator for the desired locale. |
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* @see java.util.Locale |
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* @see java.util.ResourceBundle |
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*/ |
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public static synchronized |
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Collator getInstance(Locale desiredLocale) |
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{ |
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Collator result = (Collator) cache.get(desiredLocale); |
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if (result != null) { |
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return (Collator)result.clone(); // make the world safe |
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} |
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// Check whether a provider can provide an implementation that's closer |
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// to the requested locale than what the Java runtime itself can provide. |
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LocaleServiceProviderPool pool = |
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LocaleServiceProviderPool.getPool(CollatorProvider.class); |
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if (pool.hasProviders()) { |
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Collator providersInstance = pool.getLocalizedObject( |
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CollatorGetter.INSTANCE, |
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desiredLocale, |
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desiredLocale); |
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if (providersInstance != null) { |
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return providersInstance; |
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} |
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} |
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// Load the resource of the desired locale from resource |
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// manager. |
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String colString = ""; |
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try { |
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ResourceBundle resource = LocaleData.getCollationData(desiredLocale); |
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colString = resource.getString("Rule"); |
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} catch (MissingResourceException e) { |
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// Use default values |
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} |
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try |
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{ |
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result = new RuleBasedCollator( CollationRules.DEFAULTRULES + |
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colString, |
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CANONICAL_DECOMPOSITION ); |
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} |
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catch(ParseException foo) |
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{ |
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// predefined tables should contain correct grammar |
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try { |
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result = new RuleBasedCollator( CollationRules.DEFAULTRULES ); |
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} catch (ParseException bar) { |
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// do nothing |
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} |
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} |
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// Now that RuleBasedCollator adds expansions for pre-composed characters |
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// into their decomposed equivalents, the default collators don't need |
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// to have decomposition turned on. Laura, 5/5/98, bug 4114077 |
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result.setDecomposition(NO_DECOMPOSITION); |
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cache.put(desiredLocale,result); |
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return (Collator)result.clone(); |
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} |
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/** |
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* Compares the source string to the target string according to the |
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* collation rules for this Collator. Returns an integer less than, |
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* equal to or greater than zero depending on whether the source String is |
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* less than, equal to or greater than the target string. See the Collator |
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* class description for an example of use. |
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* <p> |
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* For a one time comparison, this method has the best performance. If a |
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* given String will be involved in multiple comparisons, CollationKey.compareTo |
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* has the best performance. See the Collator class description for an example |
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* using CollationKeys. |
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* @param source the source string. |
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* @param target the target string. |
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* @return Returns an integer value. Value is less than zero if source is less than |
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* target, value is zero if source and target are equal, value is greater than zero |
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* if source is greater than target. |
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* @see java.text.CollationKey |
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* @see java.text.Collator#getCollationKey |
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*/ |
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public abstract int compare(String source, String target); |
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311 |
/** |
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312 |
* Compares its two arguments for order. Returns a negative integer, |
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* zero, or a positive integer as the first argument is less than, equal |
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* to, or greater than the second. |
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* <p> |
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316 |
* This implementation merely returns |
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* <code> compare((String)o1, (String)o2) </code>. |
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* |
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* @return a negative integer, zero, or a positive integer as the |
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* first argument is less than, equal to, or greater than the |
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* second. |
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* @exception ClassCastException the arguments cannot be cast to Strings. |
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* @see java.util.Comparator |
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* @since 1.2 |
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*/ |
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public int compare(Object o1, Object o2) { |
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return compare((String)o1, (String)o2); |
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} |
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329 |
||
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/** |
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* Transforms the String into a series of bits that can be compared bitwise |
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* to other CollationKeys. CollationKeys provide better performance than |
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* Collator.compare when Strings are involved in multiple comparisons. |
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* See the Collator class description for an example using CollationKeys. |
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* @param source the string to be transformed into a collation key. |
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* @return the CollationKey for the given String based on this Collator's collation |
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* rules. If the source String is null, a null CollationKey is returned. |
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* @see java.text.CollationKey |
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* @see java.text.Collator#compare |
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*/ |
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public abstract CollationKey getCollationKey(String source); |
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343 |
/** |
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344 |
* Convenience method for comparing the equality of two strings based on |
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* this Collator's collation rules. |
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* @param source the source string to be compared with. |
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* @param target the target string to be compared with. |
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* @return true if the strings are equal according to the collation |
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* rules. false, otherwise. |
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* @see java.text.Collator#compare |
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*/ |
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public boolean equals(String source, String target) |
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353 |
{ |
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return (compare(source, target) == Collator.EQUAL); |
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355 |
} |
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356 |
||
357 |
/** |
|
358 |
* Returns this Collator's strength property. The strength property determines |
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359 |
* the minimum level of difference considered significant during comparison. |
|
360 |
* See the Collator class description for an example of use. |
|
361 |
* @return this Collator's current strength property. |
|
362 |
* @see java.text.Collator#setStrength |
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363 |
* @see java.text.Collator#PRIMARY |
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364 |
* @see java.text.Collator#SECONDARY |
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365 |
* @see java.text.Collator#TERTIARY |
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366 |
* @see java.text.Collator#IDENTICAL |
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367 |
*/ |
|
368 |
public synchronized int getStrength() |
|
369 |
{ |
|
370 |
return strength; |
|
371 |
} |
|
372 |
||
373 |
/** |
|
374 |
* Sets this Collator's strength property. The strength property determines |
|
375 |
* the minimum level of difference considered significant during comparison. |
|
376 |
* See the Collator class description for an example of use. |
|
377 |
* @param newStrength the new strength value. |
|
378 |
* @see java.text.Collator#getStrength |
|
379 |
* @see java.text.Collator#PRIMARY |
|
380 |
* @see java.text.Collator#SECONDARY |
|
381 |
* @see java.text.Collator#TERTIARY |
|
382 |
* @see java.text.Collator#IDENTICAL |
|
383 |
* @exception IllegalArgumentException If the new strength value is not one of |
|
384 |
* PRIMARY, SECONDARY, TERTIARY or IDENTICAL. |
|
385 |
*/ |
|
386 |
public synchronized void setStrength(int newStrength) { |
|
387 |
if ((newStrength != PRIMARY) && |
|
388 |
(newStrength != SECONDARY) && |
|
389 |
(newStrength != TERTIARY) && |
|
390 |
(newStrength != IDENTICAL)) |
|
391 |
throw new IllegalArgumentException("Incorrect comparison level."); |
|
392 |
strength = newStrength; |
|
393 |
} |
|
394 |
||
395 |
/** |
|
396 |
* Get the decomposition mode of this Collator. Decomposition mode |
|
397 |
* determines how Unicode composed characters are handled. Adjusting |
|
398 |
* decomposition mode allows the user to select between faster and more |
|
399 |
* complete collation behavior. |
|
400 |
* <p>The three values for decomposition mode are: |
|
401 |
* <UL> |
|
402 |
* <LI>NO_DECOMPOSITION, |
|
403 |
* <LI>CANONICAL_DECOMPOSITION |
|
404 |
* <LI>FULL_DECOMPOSITION. |
|
405 |
* </UL> |
|
406 |
* See the documentation for these three constants for a description |
|
407 |
* of their meaning. |
|
408 |
* @return the decomposition mode |
|
409 |
* @see java.text.Collator#setDecomposition |
|
410 |
* @see java.text.Collator#NO_DECOMPOSITION |
|
411 |
* @see java.text.Collator#CANONICAL_DECOMPOSITION |
|
412 |
* @see java.text.Collator#FULL_DECOMPOSITION |
|
413 |
*/ |
|
414 |
public synchronized int getDecomposition() |
|
415 |
{ |
|
416 |
return decmp; |
|
417 |
} |
|
418 |
/** |
|
419 |
* Set the decomposition mode of this Collator. See getDecomposition |
|
420 |
* for a description of decomposition mode. |
|
421 |
* @param decompositionMode the new decomposition mode. |
|
422 |
* @see java.text.Collator#getDecomposition |
|
423 |
* @see java.text.Collator#NO_DECOMPOSITION |
|
424 |
* @see java.text.Collator#CANONICAL_DECOMPOSITION |
|
425 |
* @see java.text.Collator#FULL_DECOMPOSITION |
|
426 |
* @exception IllegalArgumentException If the given value is not a valid decomposition |
|
427 |
* mode. |
|
428 |
*/ |
|
429 |
public synchronized void setDecomposition(int decompositionMode) { |
|
430 |
if ((decompositionMode != NO_DECOMPOSITION) && |
|
431 |
(decompositionMode != CANONICAL_DECOMPOSITION) && |
|
432 |
(decompositionMode != FULL_DECOMPOSITION)) |
|
433 |
throw new IllegalArgumentException("Wrong decomposition mode."); |
|
434 |
decmp = decompositionMode; |
|
435 |
} |
|
436 |
||
437 |
/** |
|
438 |
* Returns an array of all locales for which the |
|
439 |
* <code>getInstance</code> methods of this class can return |
|
440 |
* localized instances. |
|
441 |
* The returned array represents the union of locales supported |
|
442 |
* by the Java runtime and by installed |
|
443 |
* {@link java.text.spi.CollatorProvider CollatorProvider} implementations. |
|
444 |
* It must contain at least a Locale instance equal to |
|
445 |
* {@link java.util.Locale#US Locale.US}. |
|
446 |
* |
|
447 |
* @return An array of locales for which localized |
|
448 |
* <code>Collator</code> instances are available. |
|
449 |
*/ |
|
450 |
public static synchronized Locale[] getAvailableLocales() { |
|
451 |
LocaleServiceProviderPool pool = |
|
452 |
LocaleServiceProviderPool.getPool(CollatorProvider.class); |
|
453 |
return pool.getAvailableLocales(); |
|
454 |
} |
|
455 |
||
456 |
/** |
|
457 |
* Overrides Cloneable |
|
458 |
*/ |
|
459 |
public Object clone() |
|
460 |
{ |
|
461 |
try { |
|
462 |
return (Collator)super.clone(); |
|
463 |
} catch (CloneNotSupportedException e) { |
|
10419
12c063b39232
7084245: Update usages of InternalError to use exception chaining
sherman
parents:
5506
diff
changeset
|
464 |
throw new InternalError(e); |
2 | 465 |
} |
466 |
} |
|
467 |
||
468 |
/** |
|
469 |
* Compares the equality of two Collators. |
|
470 |
* @param that the Collator to be compared with this. |
|
471 |
* @return true if this Collator is the same as that Collator; |
|
472 |
* false otherwise. |
|
473 |
*/ |
|
474 |
public boolean equals(Object that) |
|
475 |
{ |
|
476 |
if (this == that) return true; |
|
477 |
if (that == null) return false; |
|
478 |
if (getClass() != that.getClass()) return false; |
|
479 |
Collator other = (Collator) that; |
|
480 |
return ((strength == other.strength) && |
|
481 |
(decmp == other.decmp)); |
|
482 |
} |
|
483 |
||
484 |
/** |
|
485 |
* Generates the hash code for this Collator. |
|
486 |
*/ |
|
487 |
abstract public int hashCode(); |
|
488 |
||
489 |
/** |
|
490 |
* Default constructor. This constructor is |
|
491 |
* protected so subclasses can get access to it. Users typically create |
|
492 |
* a Collator sub-class by calling the factory method getInstance. |
|
493 |
* @see java.text.Collator#getInstance |
|
494 |
*/ |
|
495 |
protected Collator() |
|
496 |
{ |
|
497 |
strength = TERTIARY; |
|
498 |
decmp = CANONICAL_DECOMPOSITION; |
|
499 |
} |
|
500 |
||
501 |
private int strength = 0; |
|
502 |
private int decmp = 0; |
|
503 |
private static SoftCache cache = new SoftCache(); |
|
504 |
||
505 |
// |
|
506 |
// FIXME: These three constants should be removed. |
|
507 |
// |
|
508 |
/** |
|
509 |
* LESS is returned if source string is compared to be less than target |
|
510 |
* string in the compare() method. |
|
511 |
* @see java.text.Collator#compare |
|
512 |
*/ |
|
513 |
final static int LESS = -1; |
|
514 |
/** |
|
515 |
* EQUAL is returned if source string is compared to be equal to target |
|
516 |
* string in the compare() method. |
|
517 |
* @see java.text.Collator#compare |
|
518 |
*/ |
|
519 |
final static int EQUAL = 0; |
|
520 |
/** |
|
521 |
* GREATER is returned if source string is compared to be greater than |
|
522 |
* target string in the compare() method. |
|
523 |
* @see java.text.Collator#compare |
|
524 |
*/ |
|
525 |
final static int GREATER = 1; |
|
526 |
||
527 |
/** |
|
528 |
* Obtains a Collator instance from a CollatorProvider |
|
529 |
* implementation. |
|
530 |
*/ |
|
531 |
private static class CollatorGetter |
|
532 |
implements LocaleServiceProviderPool.LocalizedObjectGetter<CollatorProvider, Collator> { |
|
533 |
private static final CollatorGetter INSTANCE = new CollatorGetter(); |
|
534 |
||
535 |
public Collator getObject(CollatorProvider collatorProvider, |
|
536 |
Locale locale, |
|
537 |
String key, |
|
538 |
Object... params) { |
|
539 |
assert params.length == 1; |
|
540 |
Collator result = collatorProvider.getInstance(locale); |
|
541 |
if (result != null) { |
|
542 |
// put this Collator instance in the cache for two locales, one |
|
543 |
// is for the desired locale, and the other is for the actual |
|
544 |
// locale where the provider is found, which may be a fall back locale. |
|
545 |
cache.put((Locale)params[0], result); |
|
546 |
cache.put(locale, result); |
|
547 |
return (Collator)result.clone(); |
|
548 |
} |
|
549 |
||
550 |
return null; |
|
551 |
} |
|
552 |
} |
|
553 |
} |