author | chegar |
Sun, 17 Aug 2014 15:54:13 +0100 | |
changeset 25859 | 3317bb8137f4 |
parent 23010 | jdk/src/share/classes/java/text/Collator.java@6dadb192ad81 |
child 32649 | 2ee9017c7597 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
23010
6dadb192ad81
8029235: Update copyright year to match last edit in jdk8 jdk repository for 2013
lana
parents:
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diff
changeset
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* Copyright (c) 1997, 2013, 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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/* |
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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.lang.ref.SoftReference; |
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import java.text.spi.CollatorProvider; |
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import java.util.Locale; |
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import java.util.ResourceBundle; |
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import java.util.concurrent.ConcurrentHashMap; |
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import java.util.concurrent.ConcurrentMap; |
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import sun.util.locale.provider.LocaleProviderAdapter; |
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import sun.util.locale.provider.LocaleServiceProviderPool; |
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||
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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>{@code |
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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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128 |
public abstract class Collator |
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implements java.util.Comparator<Object>, Cloneable |
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{ |
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131 |
/** |
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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; |
|
159 |
||
160 |
/** |
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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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/** |
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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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183 |
/** |
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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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198 |
/** |
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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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||
217 |
/** |
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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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223 |
public static synchronized Collator getInstance() { |
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return getInstance(Locale.getDefault()); |
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} |
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226 |
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227 |
/** |
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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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231 |
* @see java.util.Locale |
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* @see java.util.ResourceBundle |
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*/ |
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public static Collator getInstance(Locale desiredLocale) { |
235 |
SoftReference<Collator> ref = cache.get(desiredLocale); |
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Collator result = (ref != null) ? ref.get() : null; |
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if (result == null) { |
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LocaleProviderAdapter adapter; |
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adapter = LocaleProviderAdapter.getAdapter(CollatorProvider.class, |
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desiredLocale); |
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CollatorProvider provider = adapter.getCollatorProvider(); |
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result = provider.getInstance(desiredLocale); |
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if (result == null) { |
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result = LocaleProviderAdapter.forJRE() |
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.getCollatorProvider().getInstance(desiredLocale); |
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} |
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while (true) { |
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248 |
if (ref != null) { |
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// Remove the empty SoftReference if any |
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250 |
cache.remove(desiredLocale, ref); |
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} |
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ref = cache.putIfAbsent(desiredLocale, new SoftReference<>(result)); |
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if (ref == null) { |
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break; |
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255 |
} |
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Collator cachedColl = ref.get(); |
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257 |
if (cachedColl != null) { |
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result = cachedColl; |
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break; |
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260 |
} |
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} |
262 |
} |
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return (Collator) result.clone(); // make the world safe |
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} |
265 |
||
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/** |
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* Compares the source string to the target string according to the |
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268 |
* 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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270 |
* 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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279 |
* @return Returns an integer value. Value is less than zero if source is less than |
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280 |
* target, value is zero if source and target are equal, value is greater than zero |
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281 |
* if source is greater than target. |
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282 |
* @see java.text.CollationKey |
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283 |
* @see java.text.Collator#getCollationKey |
|
284 |
*/ |
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285 |
public abstract int compare(String source, String target); |
|
286 |
||
287 |
/** |
|
288 |
* Compares its two arguments for order. Returns a negative integer, |
|
289 |
* zero, or a positive integer as the first argument is less than, equal |
|
290 |
* to, or greater than the second. |
|
291 |
* <p> |
|
292 |
* This implementation merely returns |
|
293 |
* <code> compare((String)o1, (String)o2) </code>. |
|
294 |
* |
|
295 |
* @return a negative integer, zero, or a positive integer as the |
|
296 |
* first argument is less than, equal to, or greater than the |
|
297 |
* second. |
|
298 |
* @exception ClassCastException the arguments cannot be cast to Strings. |
|
299 |
* @see java.util.Comparator |
|
300 |
* @since 1.2 |
|
301 |
*/ |
|
13583 | 302 |
@Override |
2 | 303 |
public int compare(Object o1, Object o2) { |
304 |
return compare((String)o1, (String)o2); |
|
305 |
} |
|
306 |
||
307 |
/** |
|
308 |
* Transforms the String into a series of bits that can be compared bitwise |
|
309 |
* to other CollationKeys. CollationKeys provide better performance than |
|
310 |
* Collator.compare when Strings are involved in multiple comparisons. |
|
311 |
* See the Collator class description for an example using CollationKeys. |
|
312 |
* @param source the string to be transformed into a collation key. |
|
313 |
* @return the CollationKey for the given String based on this Collator's collation |
|
314 |
* rules. If the source String is null, a null CollationKey is returned. |
|
315 |
* @see java.text.CollationKey |
|
316 |
* @see java.text.Collator#compare |
|
317 |
*/ |
|
318 |
public abstract CollationKey getCollationKey(String source); |
|
319 |
||
320 |
/** |
|
321 |
* Convenience method for comparing the equality of two strings based on |
|
322 |
* this Collator's collation rules. |
|
323 |
* @param source the source string to be compared with. |
|
324 |
* @param target the target string to be compared with. |
|
325 |
* @return true if the strings are equal according to the collation |
|
326 |
* rules. false, otherwise. |
|
327 |
* @see java.text.Collator#compare |
|
328 |
*/ |
|
329 |
public boolean equals(String source, String target) |
|
330 |
{ |
|
331 |
return (compare(source, target) == Collator.EQUAL); |
|
332 |
} |
|
333 |
||
334 |
/** |
|
335 |
* Returns this Collator's strength property. The strength property determines |
|
336 |
* the minimum level of difference considered significant during comparison. |
|
337 |
* See the Collator class description for an example of use. |
|
338 |
* @return this Collator's current strength property. |
|
339 |
* @see java.text.Collator#setStrength |
|
340 |
* @see java.text.Collator#PRIMARY |
|
341 |
* @see java.text.Collator#SECONDARY |
|
342 |
* @see java.text.Collator#TERTIARY |
|
343 |
* @see java.text.Collator#IDENTICAL |
|
344 |
*/ |
|
345 |
public synchronized int getStrength() |
|
346 |
{ |
|
347 |
return strength; |
|
348 |
} |
|
349 |
||
350 |
/** |
|
351 |
* Sets this Collator's strength property. The strength property determines |
|
352 |
* the minimum level of difference considered significant during comparison. |
|
353 |
* See the Collator class description for an example of use. |
|
354 |
* @param newStrength the new strength value. |
|
355 |
* @see java.text.Collator#getStrength |
|
356 |
* @see java.text.Collator#PRIMARY |
|
357 |
* @see java.text.Collator#SECONDARY |
|
358 |
* @see java.text.Collator#TERTIARY |
|
359 |
* @see java.text.Collator#IDENTICAL |
|
360 |
* @exception IllegalArgumentException If the new strength value is not one of |
|
361 |
* PRIMARY, SECONDARY, TERTIARY or IDENTICAL. |
|
362 |
*/ |
|
363 |
public synchronized void setStrength(int newStrength) { |
|
364 |
if ((newStrength != PRIMARY) && |
|
365 |
(newStrength != SECONDARY) && |
|
366 |
(newStrength != TERTIARY) && |
|
13583 | 367 |
(newStrength != IDENTICAL)) { |
2 | 368 |
throw new IllegalArgumentException("Incorrect comparison level."); |
13583 | 369 |
} |
2 | 370 |
strength = newStrength; |
371 |
} |
|
372 |
||
373 |
/** |
|
374 |
* Get the decomposition mode of this Collator. Decomposition mode |
|
375 |
* determines how Unicode composed characters are handled. Adjusting |
|
376 |
* decomposition mode allows the user to select between faster and more |
|
377 |
* complete collation behavior. |
|
378 |
* <p>The three values for decomposition mode are: |
|
379 |
* <UL> |
|
380 |
* <LI>NO_DECOMPOSITION, |
|
381 |
* <LI>CANONICAL_DECOMPOSITION |
|
382 |
* <LI>FULL_DECOMPOSITION. |
|
383 |
* </UL> |
|
384 |
* See the documentation for these three constants for a description |
|
385 |
* of their meaning. |
|
386 |
* @return the decomposition mode |
|
387 |
* @see java.text.Collator#setDecomposition |
|
388 |
* @see java.text.Collator#NO_DECOMPOSITION |
|
389 |
* @see java.text.Collator#CANONICAL_DECOMPOSITION |
|
390 |
* @see java.text.Collator#FULL_DECOMPOSITION |
|
391 |
*/ |
|
392 |
public synchronized int getDecomposition() |
|
393 |
{ |
|
394 |
return decmp; |
|
395 |
} |
|
396 |
/** |
|
397 |
* Set the decomposition mode of this Collator. See getDecomposition |
|
398 |
* for a description of decomposition mode. |
|
399 |
* @param decompositionMode the new decomposition mode. |
|
400 |
* @see java.text.Collator#getDecomposition |
|
401 |
* @see java.text.Collator#NO_DECOMPOSITION |
|
402 |
* @see java.text.Collator#CANONICAL_DECOMPOSITION |
|
403 |
* @see java.text.Collator#FULL_DECOMPOSITION |
|
404 |
* @exception IllegalArgumentException If the given value is not a valid decomposition |
|
405 |
* mode. |
|
406 |
*/ |
|
407 |
public synchronized void setDecomposition(int decompositionMode) { |
|
408 |
if ((decompositionMode != NO_DECOMPOSITION) && |
|
409 |
(decompositionMode != CANONICAL_DECOMPOSITION) && |
|
13583 | 410 |
(decompositionMode != FULL_DECOMPOSITION)) { |
2 | 411 |
throw new IllegalArgumentException("Wrong decomposition mode."); |
13583 | 412 |
} |
2 | 413 |
decmp = decompositionMode; |
414 |
} |
|
415 |
||
416 |
/** |
|
417 |
* Returns an array of all locales for which the |
|
418 |
* <code>getInstance</code> methods of this class can return |
|
419 |
* localized instances. |
|
420 |
* The returned array represents the union of locales supported |
|
421 |
* by the Java runtime and by installed |
|
422 |
* {@link java.text.spi.CollatorProvider CollatorProvider} implementations. |
|
423 |
* It must contain at least a Locale instance equal to |
|
424 |
* {@link java.util.Locale#US Locale.US}. |
|
425 |
* |
|
426 |
* @return An array of locales for which localized |
|
427 |
* <code>Collator</code> instances are available. |
|
428 |
*/ |
|
429 |
public static synchronized Locale[] getAvailableLocales() { |
|
430 |
LocaleServiceProviderPool pool = |
|
431 |
LocaleServiceProviderPool.getPool(CollatorProvider.class); |
|
432 |
return pool.getAvailableLocales(); |
|
433 |
} |
|
434 |
||
435 |
/** |
|
436 |
* Overrides Cloneable |
|
437 |
*/ |
|
13583 | 438 |
@Override |
2 | 439 |
public Object clone() |
440 |
{ |
|
441 |
try { |
|
442 |
return (Collator)super.clone(); |
|
443 |
} catch (CloneNotSupportedException e) { |
|
10419
12c063b39232
7084245: Update usages of InternalError to use exception chaining
sherman
parents:
5506
diff
changeset
|
444 |
throw new InternalError(e); |
2 | 445 |
} |
446 |
} |
|
447 |
||
448 |
/** |
|
449 |
* Compares the equality of two Collators. |
|
450 |
* @param that the Collator to be compared with this. |
|
451 |
* @return true if this Collator is the same as that Collator; |
|
452 |
* false otherwise. |
|
453 |
*/ |
|
13583 | 454 |
@Override |
2 | 455 |
public boolean equals(Object that) |
456 |
{ |
|
13583 | 457 |
if (this == that) { |
458 |
return true; |
|
459 |
} |
|
460 |
if (that == null) { |
|
461 |
return false; |
|
462 |
} |
|
463 |
if (getClass() != that.getClass()) { |
|
464 |
return false; |
|
465 |
} |
|
2 | 466 |
Collator other = (Collator) that; |
467 |
return ((strength == other.strength) && |
|
468 |
(decmp == other.decmp)); |
|
469 |
} |
|
470 |
||
471 |
/** |
|
472 |
* Generates the hash code for this Collator. |
|
473 |
*/ |
|
13583 | 474 |
@Override |
2 | 475 |
abstract public int hashCode(); |
476 |
||
477 |
/** |
|
478 |
* Default constructor. This constructor is |
|
479 |
* protected so subclasses can get access to it. Users typically create |
|
480 |
* a Collator sub-class by calling the factory method getInstance. |
|
481 |
* @see java.text.Collator#getInstance |
|
482 |
*/ |
|
483 |
protected Collator() |
|
484 |
{ |
|
485 |
strength = TERTIARY; |
|
486 |
decmp = CANONICAL_DECOMPOSITION; |
|
487 |
} |
|
488 |
||
489 |
private int strength = 0; |
|
490 |
private int decmp = 0; |
|
13583 | 491 |
private static final ConcurrentMap<Locale, SoftReference<Collator>> cache |
492 |
= new ConcurrentHashMap<>(); |
|
2 | 493 |
|
494 |
// |
|
495 |
// FIXME: These three constants should be removed. |
|
496 |
// |
|
497 |
/** |
|
498 |
* LESS is returned if source string is compared to be less than target |
|
499 |
* string in the compare() method. |
|
500 |
* @see java.text.Collator#compare |
|
501 |
*/ |
|
502 |
final static int LESS = -1; |
|
503 |
/** |
|
504 |
* EQUAL is returned if source string is compared to be equal to target |
|
505 |
* string in the compare() method. |
|
506 |
* @see java.text.Collator#compare |
|
507 |
*/ |
|
508 |
final static int EQUAL = 0; |
|
509 |
/** |
|
510 |
* GREATER is returned if source string is compared to be greater than |
|
511 |
* target string in the compare() method. |
|
512 |
* @see java.text.Collator#compare |
|
513 |
*/ |
|
514 |
final static int GREATER = 1; |
|
515 |
} |