982 lines
42 KiB
C++
982 lines
42 KiB
C++
/*
|
||
******************************************************************************
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||
* Copyright (C) 1996-2003, International Business Machines *
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* Corporation and others. All Rights Reserved. *
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******************************************************************************
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*/
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/**
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* File coll.h
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*
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* Created by: Helena Shih
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*
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||
* Modification History:
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*
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||
* Date Name Description
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||
* 02/5/97 aliu Modified createDefault to load collation data from
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* binary files when possible. Added related methods
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* createCollationFromFile, chopLocale, createPathName.
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* 02/11/97 aliu Added members addToCache, findInCache, and fgCache.
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* 02/12/97 aliu Modified to create objects from RuleBasedCollator cache.
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* Moved cache out of Collation class.
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* 02/13/97 aliu Moved several methods out of this class and into
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* RuleBasedCollator, with modifications. Modified
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* createDefault() to call new RuleBasedCollator(Locale&)
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* constructor. General clean up and documentation.
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* 02/20/97 helena Added clone, operator==, operator!=, operator=, copy
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* constructor and getDynamicClassID.
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* 03/25/97 helena Updated with platform independent data types.
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* 05/06/97 helena Added memory allocation error detection.
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* 06/20/97 helena Java class name change.
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* 09/03/97 helena Added createCollationKeyValues().
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||
* 02/10/98 damiba Added compare() with length as parameter.
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* 04/23/99 stephen Removed EDecompositionMode, merged with
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* Normalizer::EMode.
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* 11/02/99 helena Collator performance enhancements. Eliminates the
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* UnicodeString construction and special case for NO_OP.
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* 11/23/99 srl More performance enhancements. Inlining of
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* critical accessors.
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* 05/15/00 helena Added version information API.
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* 01/29/01 synwee Modified into a C++ wrapper which calls C apis
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* (ucoll.h).
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*/
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#ifndef COLL_H
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#define COLL_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_COLLATION
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#include "unicode/uobject.h"
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#include "unicode/ucol.h"
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#include "unicode/normlzr.h"
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#include "unicode/locid.h"
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#include "unicode/uniset.h"
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U_NAMESPACE_BEGIN
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class StringEnumeration;
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/**
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* @draft ICU 2.6
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*/
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typedef const void* URegistryKey;
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/**
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* @draft ICU 2.6
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*/
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class CollatorFactory;
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/**
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* @stable ICU 2.0
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*/
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class CollationKey;
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/**
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* The <code>Collator</code> class performs locale-sensitive string
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* comparison.<br>
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* You use this class to build searching and sorting routines for natural
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* language text.<br>
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* <em>Important: </em>The ICU collation service has been reimplemented
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* in order to achieve better performance and UCA compliance.
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* For details, see the
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* <a href="http://oss.software.ibm.com/cvs/icu/~checkout~/icuhtml/design/collation/ICU_collation_design.htm">
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* collation design document</a>.
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* <p>
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* <code>Collator</code> is an abstract base class. Subclasses implement
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* specific collation strategies. One subclass,
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* <code>RuleBasedCollator</code>, is currently provided and is applicable
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* to a wide set of languages. Other subclasses may be created to handle more
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* specialized needs.
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* <p>
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* Like other locale-sensitive classes, you can use the static factory method,
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* <code>createInstance</code>, to obtain the appropriate
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* <code>Collator</code> object for a given locale. You will only need to
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* look at the subclasses of <code>Collator</code> if you need to
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* understand the details of a particular collation strategy or if you need to
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* modify that strategy.
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* <p>
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||
* The following example shows how to compare two strings using the
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* <code>Collator</code> for the default locale.
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* <blockquote>
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* <pre>
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* \code
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* // Compare two strings in the default locale
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* UErrorCode success = U_ZERO_ERROR;
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* Collator* myCollator = Collator::createInstance(success);
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* if (myCollator->compare("abc", "ABC") < 0)
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* cout << "abc is less than ABC" << endl;
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* else
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* cout << "abc is greater than or equal to ABC" << endl;
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* \endcode
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* </pre>
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* </blockquote>
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* <p>
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* You can set a <code>Collator</code>'s <em>strength</em> property to
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* determine the level of difference considered significant in comparisons.
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* Five strengths are provided: <code>PRIMARY</code>, <code>SECONDARY</code>,
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* <code>TERTIARY</code>, <code>QUATERNARY</code> and <code>IDENTICAL</code>. The exact assignment of
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* strengths to language features is locale dependant. For example, in Czech,
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* "e" and "f" are considered primary differences, while "e" and "\u00EA" are
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* secondary differences, "e" and "E" are tertiary differences and "e" and "e"
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* are identical. The following shows how both case and accents could be
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* ignored for US English.
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* <blockquote>
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* <pre>
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* \code
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* //Get the Collator for US English and set its strength to PRIMARY
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* UErrorCode success = U_ZERO_ERROR;
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* Collator* usCollator =
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* Collator::createInstance(Locale::US, success);
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* usCollator->setStrength(Collator::PRIMARY);
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* if (usCollator->compare("abc", "ABC") == 0)
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* cout <<
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* "'abc' and 'ABC' strings are equivalent with strength PRIMARY" <<
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* endl;
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* \endcode
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* </pre>
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* </blockquote>
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* <p>
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* For comparing strings exactly once, the <code>compare</code> method
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* provides the best performance. When sorting a list of strings however, it
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* is generally necessary to compare each string multiple times. In this case,
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* sort keys provide better performance. The <code>getSortKey</code> methods
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* convert a string to a series of bytes that can be compared bitwise against
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* other sort keys using <code>strcmp()</code>. Sort keys are written as
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* zero-terminated byte strings. They consist of several substrings, one for
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* each collation strength level, that are delimited by 0x01 bytes.
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* If the string code points are appended for UCOL_IDENTICAL, then they are
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* processed for correct code point order comparison and may contain 0x01
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* bytes but not zero bytes.
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* </p>
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* <p>
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* An older set of APIs returns a <code>CollationKey</code> object that wraps
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* the sort key bytes instead of returning the bytes themselves.
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* Its use is deprecated, but it is still available for compatibility with
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* Java.
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* </p>
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* <p>
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* <strong>Note:</strong> <code>Collator</code>s with different Locale,
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* and CollationStrength settings will return different sort
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* orders for the same set of strings. Locales have specific collation rules,
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* and the way in which secondary and tertiary differences are taken into
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* account, for example, will result in a different sorting order for same
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* strings.
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* </p>
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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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* @see Normalizer
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* @version 2.0 11/15/01
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*/
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class U_I18N_API Collator : public UObject {
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public:
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// Collator public enums -----------------------------------------------
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/**
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* Base letter represents a primary difference. Set comparison level to
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* PRIMARY to ignore secondary and tertiary differences.<br>
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* Use this to set the strength of a Collator object.<br>
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* Example of primary difference, "abc" < "abd"
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*
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* Diacritical differences on the same base letter represent a secondary
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* difference. Set comparison level to SECONDARY to ignore tertiary
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* differences. Use this to set the strength of a Collator object.<br>
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* Example of secondary difference, "<22>" >> "a".
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*
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* Uppercase and lowercase versions of the same character represents a
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* tertiary difference. Set comparison level to TERTIARY to include all
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* comparison differences. Use this to set the strength of a Collator
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* object.<br>
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* Example of tertiary difference, "abc" <<< "ABC".
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*
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* Two characters are considered "identical" when they have the same unicode
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* spellings.<br>
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* For example, "<22>" == "<22>".
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*
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* UCollationStrength is also used to determine the strength of sort keys
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* generated from Collator objects.
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* @stable ICU 2.0
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*/
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enum ECollationStrength
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{
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PRIMARY = 0,
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SECONDARY = 1,
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TERTIARY = 2,
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QUATERNARY = 3,
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IDENTICAL = 15
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};
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/**
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* LESS is returned if source string is compared to be less than target
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* string in the compare() method.
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* EQUAL is returned if source string is compared to be equal to target
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* string in the compare() method.
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* GREATER is returned if source string is compared to be greater than
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* target string in the compare() method.
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* @see Collator#compare
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* @deprecated ICU 2.6. Use C enum UCollationResult defined in ucol.h
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*/
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enum EComparisonResult
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{
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LESS = -1,
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EQUAL = 0,
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GREATER = 1
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};
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// Collator public destructor -----------------------------------------
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||
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/**
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* Destructor
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* @stable ICU 2.0
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||
*/
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virtual ~Collator();
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||
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// Collator public methods --------------------------------------------
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/**
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* Returns true if "other" is the same as "this"
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* @param other Collator object to be compared
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* @return true if other is the same as this.
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||
* @stable ICU 2.0
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||
*/
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virtual UBool operator==(const Collator& other) const;
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/**
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* Returns true if "other" is not the same as "this".
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* @param other Collator object to be compared
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* @return true if other is not the same as this.
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* @stable ICU 2.0
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*/
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virtual UBool operator!=(const Collator& other) const;
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||
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/**
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* Makes a shallow copy of the current object.
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* @return a copy of this object
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* @stable ICU 2.0
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*/
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virtual Collator* clone(void) const = 0;
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||
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/**
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* Creates the Collator object for the current default locale.
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* The default locale is determined by Locale::getDefault.
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* The UErrorCode& err parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check the
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* value of U_SUCCESS(err). If you wish more detailed information, you can
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* check for informational error results which still indicate success.
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* U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_ERROR indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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||
* The caller owns the returned object and is responsible for deleting it.
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||
*
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* @param err the error code status.
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||
* @return the collation object of the default locale.(for example, en_US)
|
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* @see Locale#getDefault
|
||
* @stable ICU 2.0
|
||
*/
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static Collator* createInstance(UErrorCode& err);
|
||
|
||
/**
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* Gets the table-based collation object for the desired locale. The
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* resource of the desired locale will be loaded by ResourceLoader.
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* Locale::ENGLISH is the base collation table and all other languages are
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* built on top of it with additional language-specific modifications.
|
||
* The UErrorCode& err parameter is used to return status information to the user.
|
||
* To check whether the construction succeeded or not, you should check
|
||
* the value of U_SUCCESS(err). If you wish more detailed information, you
|
||
* can check for informational error results which still indicate success.
|
||
* U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
|
||
* example, 'de_CH' was requested, but nothing was found there, so 'de' was
|
||
* used. U_USING_DEFAULT_ERROR indicates that the default locale data was
|
||
* used; neither the requested locale nor any of its fall back locales
|
||
* could be found.
|
||
* The caller owns the returned object and is responsible for deleting it.
|
||
* @param loc The locale ID for which to open a collator.
|
||
* @param err the error code status.
|
||
* @return the created table-based collation object based on the desired
|
||
* locale.
|
||
* @see Locale
|
||
* @see ResourceLoader
|
||
* @stable ICU 2.2
|
||
*/
|
||
static Collator* createInstance(const Locale& loc, UErrorCode& err);
|
||
|
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/**
|
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* Create a Collator with a specific version.
|
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* This is the same as createInstance(loc, err) except that getVersion() of
|
||
* the returned object is guaranteed to be the same as the version
|
||
* parameter.
|
||
* This is designed to be used to open the same collator for a given
|
||
* locale even when ICU is updated.
|
||
* The same locale and version guarantees the same sort keys and
|
||
* comparison results.
|
||
* <p>
|
||
* Note: this API will be removed in a future release. Use
|
||
* <tt>createInstance(const Locale&, UErrorCode&) instead.</tt></p>
|
||
*
|
||
* @param loc The locale ID for which to open a collator.
|
||
* @param version The requested collator version.
|
||
* @param err A reference to a UErrorCode,
|
||
* must not indicate a failure before calling this function.
|
||
* @return A pointer to a Collator, or 0 if an error occurred
|
||
* or a collator with the requested version is not available.
|
||
*
|
||
* @see getVersion
|
||
* @obsolete ICU 2.6
|
||
*/
|
||
static Collator *createInstance(const Locale &loc, UVersionInfo version, UErrorCode &err);
|
||
|
||
/**
|
||
* The comparison function compares the character data stored in two
|
||
* different strings. Returns information about whether a string is less
|
||
* than, greater than or equal to another string.
|
||
* @param source the source string to be compared with.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @return Returns a byte value. GREATER if source is greater
|
||
* than target; EQUAL if source is equal to target; LESS if source is less
|
||
* than target
|
||
* @deprecated ICU 2.6 use the overload with UErrorCode &
|
||
*/
|
||
virtual EComparisonResult compare(const UnicodeString& source,
|
||
const UnicodeString& target) const;
|
||
|
||
/**
|
||
* The comparison function compares the character data stored in two
|
||
* different strings. Returns information about whether a string is less
|
||
* than, greater than or equal to another string.
|
||
* @param source the source string to be compared with.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @param status possible error code
|
||
* @return Returns an enum value. UCOL_GREATER if source is greater
|
||
* than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
|
||
* than target
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual UCollationResult compare(const UnicodeString& source,
|
||
const UnicodeString& target,
|
||
UErrorCode &status) const = 0;
|
||
|
||
/**
|
||
* Does the same thing as compare but limits the comparison to a specified
|
||
* length
|
||
* @param source the source string to be compared with.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @param length the length the comparison is limited to
|
||
* @return Returns a byte value. GREATER if source (up to the specified
|
||
* length) is greater than target; EQUAL if source (up to specified
|
||
* length) is equal to target; LESS if source (up to the specified
|
||
* length) is less than target.
|
||
* @deprecated ICU 2.6 use the overload with UErrorCode &
|
||
*/
|
||
virtual EComparisonResult compare(const UnicodeString& source,
|
||
const UnicodeString& target,
|
||
int32_t length) const;
|
||
|
||
/**
|
||
* Does the same thing as compare but limits the comparison to a specified
|
||
* length
|
||
* @param source the source string to be compared with.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @param length the length the comparison is limited to
|
||
* @param status possible error code
|
||
* @return Returns an enum value. UCOL_GREATER if source (up to the specified
|
||
* length) is greater than target; UCOL_EQUAL if source (up to specified
|
||
* length) is equal to target; UCOL_LESS if source (up to the specified
|
||
* length) is less than target.
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual UCollationResult compare(const UnicodeString& source,
|
||
const UnicodeString& target,
|
||
int32_t length,
|
||
UErrorCode &status) const = 0;
|
||
|
||
/**
|
||
* The comparison function compares the character data stored in two
|
||
* different string arrays. Returns information about whether a string array
|
||
* is less than, greater than or equal to another string array.
|
||
* @param source the source string array to be compared with.
|
||
* @param sourceLength the length of the source string array. If this value
|
||
* is equal to -1, the string array is null-terminated.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @param targetLength the length of the target string array. If this value
|
||
* is equal to -1, the string array is null-terminated.
|
||
* @return Returns a byte value. GREATER if source is greater than target;
|
||
* EQUAL if source is equal to target; LESS if source is less than
|
||
* target
|
||
* @deprecated ICU 2.6 use the overload with UErrorCode &
|
||
*/
|
||
virtual EComparisonResult compare(const UChar* source, int32_t sourceLength,
|
||
const UChar* target, int32_t targetLength)
|
||
const;
|
||
|
||
/**
|
||
* The comparison function compares the character data stored in two
|
||
* different string arrays. Returns information about whether a string array
|
||
* is less than, greater than or equal to another string array.
|
||
* @param source the source string array to be compared with.
|
||
* @param sourceLength the length of the source string array. If this value
|
||
* is equal to -1, the string array is null-terminated.
|
||
* @param target the string that is to be compared with the source string.
|
||
* @param targetLength the length of the target string array. If this value
|
||
* is equal to -1, the string array is null-terminated.
|
||
* @param status possible error code
|
||
* @return Returns an enum value. UCOL_GREATER if source is greater
|
||
* than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
|
||
* than target
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual UCollationResult compare(const UChar* source, int32_t sourceLength,
|
||
const UChar* target, int32_t targetLength,
|
||
UErrorCode &status) const = 0;
|
||
|
||
/**
|
||
* Transforms the string into a series of characters that can be compared
|
||
* with CollationKey::compareTo. It is not possible to restore the original
|
||
* string from the chars in the sort key. The generated sort key handles
|
||
* only a limited number of ignorable characters.
|
||
* <p>Use CollationKey::equals or CollationKey::compare to compare the
|
||
* generated sort keys.
|
||
* If the source string is null, a null collation key will be returned.
|
||
* @param source the source string to be transformed into a sort key.
|
||
* @param key the collation key to be filled in
|
||
* @param status the error code status.
|
||
* @return the collation key of the string based on the collation rules.
|
||
* @see CollationKey#compare
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual CollationKey& getCollationKey(const UnicodeString& source,
|
||
CollationKey& key,
|
||
UErrorCode& status) const = 0;
|
||
|
||
/**
|
||
* Transforms the string into a series of characters that can be compared
|
||
* with CollationKey::compareTo. It is not possible to restore the original
|
||
* string from the chars in the sort key. The generated sort key handles
|
||
* only a limited number of ignorable characters.
|
||
* <p>Use CollationKey::equals or CollationKey::compare to compare the
|
||
* generated sort keys.
|
||
* <p>If the source string is null, a null collation key will be returned.
|
||
* @param source the source string to be transformed into a sort key.
|
||
* @param sourceLength length of the collation key
|
||
* @param key the collation key to be filled in
|
||
* @param status the error code status.
|
||
* @return the collation key of the string based on the collation rules.
|
||
* @see CollationKey#compare
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual CollationKey& getCollationKey(const UChar*source,
|
||
int32_t sourceLength,
|
||
CollationKey& key,
|
||
UErrorCode& status) const = 0;
|
||
/**
|
||
* Generates the hash code for the collation object
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual int32_t hashCode(void) const = 0;
|
||
|
||
/**
|
||
* Gets the locale of the Collator
|
||
*
|
||
* @param type can be either requested, valid or actual locale. For more
|
||
* information see the definition of ULocDataLocaleType in
|
||
* uloc.h
|
||
* @param status the error code status.
|
||
* @return locale where the collation data lives. If the collator
|
||
* was instantiated from rules, locale is empty.
|
||
* @stable ICU 2.1
|
||
*/
|
||
virtual const Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const = 0;
|
||
|
||
/**
|
||
* Convenience method for comparing two strings based on the collation rules.
|
||
* @param source the source string to be compared with.
|
||
* @param target the target string to be compared with.
|
||
* @return true if the first string is greater than the second one,
|
||
* according to the collation rules. false, otherwise.
|
||
* @see Collator#compare
|
||
* @stable ICU 2.0
|
||
*/
|
||
UBool greater(const UnicodeString& source, const UnicodeString& target)
|
||
const;
|
||
|
||
/**
|
||
* Convenience method for comparing two strings based on the collation rules.
|
||
* @param source the source string to be compared with.
|
||
* @param target the target string to be compared with.
|
||
* @return true if the first string is greater than or equal to the second
|
||
* one, according to the collation rules. false, otherwise.
|
||
* @see Collator#compare
|
||
* @stable ICU 2.0
|
||
*/
|
||
UBool greaterOrEqual(const UnicodeString& source,
|
||
const UnicodeString& target) const;
|
||
|
||
/**
|
||
* Convenience method for comparing two strings based on the collation rules.
|
||
* @param source the source string to be compared with.
|
||
* @param target the target string to be compared with.
|
||
* @return true if the strings are equal according to the collation rules.
|
||
* false, otherwise.
|
||
* @see Collator#compare
|
||
* @stable ICU 2.0
|
||
*/
|
||
UBool equals(const UnicodeString& source, const UnicodeString& target) const;
|
||
|
||
/**
|
||
* Determines the minimum strength that will be use in comparison or
|
||
* transformation.
|
||
* <p>E.g. with strength == SECONDARY, the tertiary difference is ignored
|
||
* <p>E.g. with strength == PRIMARY, the secondary and tertiary difference
|
||
* are ignored.
|
||
* @return the current comparison level.
|
||
* @see Collator#setStrength
|
||
* @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead
|
||
*/
|
||
virtual ECollationStrength getStrength(void) const = 0;
|
||
|
||
/**
|
||
* Sets the minimum strength to be used in comparison or transformation.
|
||
* <p>Example of use:
|
||
* <pre>
|
||
* \code
|
||
* UErrorCode status = U_ZERO_ERROR;
|
||
* Collator*myCollation = Collator::createInstance(Locale::US,
|
||
* status);
|
||
* if (U_FAILURE(status)) return;
|
||
* myCollation->setStrength(Collator::PRIMARY);
|
||
* // result will be "abc" == "ABC"
|
||
* // tertiary differences will be ignored
|
||
* Collator::ComparisonResult result = myCollation->compare("abc",
|
||
* "ABC");
|
||
* \endcode
|
||
* </pre>
|
||
* @see Collator#getStrength
|
||
* @param newStrength the new comparison level.
|
||
* @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead
|
||
*/
|
||
virtual void setStrength(ECollationStrength newStrength) = 0;
|
||
|
||
/**
|
||
* Get name of the object for the desired Locale, in the desired langauge
|
||
* @param objectLocale must be from getAvailableLocales
|
||
* @param displayLocale specifies the desired locale for output
|
||
* @param name the fill-in parameter of the return value
|
||
* @return display-able name of the object for the object locale in the
|
||
* desired language
|
||
* @stable ICU 2.0
|
||
*/
|
||
static UnicodeString& getDisplayName(const Locale& objectLocale,
|
||
const Locale& displayLocale,
|
||
UnicodeString& name);
|
||
|
||
/**
|
||
* Get name of the object for the desired Locale, in the langauge of the
|
||
* default locale.
|
||
* @param objectLocale must be from getAvailableLocales
|
||
* @param name the fill-in parameter of the return value
|
||
* @return name of the object for the desired locale in the default language
|
||
* @stable ICU 2.0
|
||
*/
|
||
static UnicodeString& getDisplayName(const Locale& objectLocale,
|
||
UnicodeString& name);
|
||
|
||
/**
|
||
* Get the set of Locales for which Collations are installed.
|
||
*
|
||
* <p>Note this does not include locales supported by registered collators.
|
||
* If collators might have been registered, use the overload of getAvailableLocales
|
||
* that returns a StringEnumeration.</p>
|
||
*
|
||
* @param count the output parameter of number of elements in the locale list
|
||
* @return the list of available locales for which collations are installed
|
||
* @stable ICU 2.0
|
||
*/
|
||
static const Locale* getAvailableLocales(int32_t& count);
|
||
|
||
/**
|
||
* Return a StringEnumeration over the locales available at the time of the call,
|
||
* including registered locales. If a severe error occurs (such as out of memory
|
||
* condition) this will return null. If there is no locale data, an empty enumeration
|
||
* will be returned.
|
||
* @return a StringEnumeration over the locales available at the time of the call
|
||
* @draft ICU 2.6
|
||
*/
|
||
static StringEnumeration* getAvailableLocales(void);
|
||
|
||
/**
|
||
* Register a new Collator. The collator will be adopted.
|
||
* @param toAdopt the Collator instance to be adopted
|
||
* @param locale the locale with which the collator will be associated
|
||
* @param status the in/out status code, no special meanings are assigned
|
||
* @return a registry key that can be used to unregister this collator
|
||
* @draft ICU 2.6
|
||
*/
|
||
static URegistryKey registerInstance(Collator* toAdopt, const Locale& locale, UErrorCode& status);
|
||
|
||
/**
|
||
* Register a new CollatorFactory. The factory will be adopted.
|
||
* @param toAdopt the CollatorFactory instance to be adopted
|
||
* @param status the in/out status code, no special meanings are assigned
|
||
* @return a registry key that can be used to unregister this collator
|
||
* @draft ICU 2.6
|
||
*/
|
||
static URegistryKey registerFactory(CollatorFactory* toAdopt, UErrorCode& status);
|
||
|
||
/**
|
||
* Unregister a previously-registered Collator or CollatorFactory
|
||
* using the key returned from the register call. Key becomes
|
||
* invalid after a successful call and should not be used again.
|
||
* The object corresponding to the key will be deleted.
|
||
* @param key the registry key returned by a previous call to registerInstance
|
||
* @param status the in/out status code, no special meanings are assigned
|
||
* @return TRUE if the collator for the key was successfully unregistered
|
||
* @draft ICU 2.6
|
||
*/
|
||
static UBool unregister(URegistryKey key, UErrorCode& status);
|
||
|
||
/**
|
||
* Gets the version information for a Collator.
|
||
* @param info the version # information, the result will be filled in
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual void getVersion(UVersionInfo info) const = 0;
|
||
|
||
/**
|
||
* Returns a unique class ID POLYMORPHICALLY. Pure virtual method.
|
||
* This method is to implement a simple version of RTTI, since not all C++
|
||
* compilers support genuine RTTI. Polymorphic operator==() and clone()
|
||
* methods call this method.
|
||
* @return The class ID for this object. All objects of a given class have
|
||
* the same class ID. Objects of other classes have different class
|
||
* IDs.
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual UClassID getDynamicClassID(void) const = 0;
|
||
|
||
/**
|
||
* Universal attribute setter
|
||
* @param attr attribute type
|
||
* @param value attribute value
|
||
* @param status to indicate whether the operation went on smoothly or
|
||
* there were errors
|
||
* @stable ICU 2.2
|
||
*/
|
||
virtual void setAttribute(UColAttribute attr, UColAttributeValue value,
|
||
UErrorCode &status) = 0;
|
||
|
||
/**
|
||
* Universal attribute getter
|
||
* @param attr attribute type
|
||
* @param status to indicate whether the operation went on smoothly or
|
||
* there were errors
|
||
* @return attribute value
|
||
* @stable ICU 2.2
|
||
*/
|
||
virtual UColAttributeValue getAttribute(UColAttribute attr,
|
||
UErrorCode &status) = 0;
|
||
|
||
/**
|
||
* Sets the variable top to a collation element value of a string supplied.
|
||
* @param varTop one or more (if contraction) UChars to which the variable top should be set
|
||
* @param len length of variable top string. If -1 it is considered to be zero terminated.
|
||
* @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
|
||
* U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br>
|
||
* U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes
|
||
* @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual uint32_t setVariableTop(const UChar *varTop, int32_t len, UErrorCode &status) = 0;
|
||
|
||
/**
|
||
* Sets the variable top to a collation element value of a string supplied.
|
||
* @param varTop an UnicodeString size 1 or more (if contraction) of UChars to which the variable top should be set
|
||
* @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
|
||
* U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br>
|
||
* U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes
|
||
* @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual uint32_t setVariableTop(const UnicodeString varTop, UErrorCode &status) = 0;
|
||
|
||
/**
|
||
* Sets the variable top to a collation element value supplied. Variable top is set to the upper 16 bits.
|
||
* Lower 16 bits are ignored.
|
||
* @param varTop CE value, as returned by setVariableTop or ucol)getVariableTop
|
||
* @param status error code (not changed by function)
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual void setVariableTop(const uint32_t varTop, UErrorCode &status) = 0;
|
||
|
||
/**
|
||
* Gets the variable top value of a Collator.
|
||
* Lower 16 bits are undefined and should be ignored.
|
||
* @param status error code (not changed by function). If error code is set, the return value is undefined.
|
||
* @stable ICU 2.0
|
||
*/
|
||
virtual uint32_t getVariableTop(UErrorCode &status) const = 0;
|
||
|
||
/**
|
||
* Get an UnicodeSet that contains all the characters and sequences
|
||
* tailored in this collator.
|
||
* @param status error code of the operation
|
||
* @return a pointer to a UnicodeSet object containing all the
|
||
* code points and sequences that may sort differently than
|
||
* in the UCA. The object must be disposed of by using delete
|
||
* @draft ICU 2.4
|
||
*/
|
||
virtual UnicodeSet *getTailoredSet(UErrorCode &status) const;
|
||
|
||
|
||
/**
|
||
* Thread safe cloning operation
|
||
* @return pointer to the new clone, user should remove it.
|
||
* @stable ICU 2.2
|
||
*/
|
||
virtual Collator* safeClone(void) = 0;
|
||
|
||
/**
|
||
* Get the sort key as an array of bytes from an UnicodeString.
|
||
* Sort key byte arrays are zero-terminated and can be compared using
|
||
* strcmp().
|
||
* @param source string to be processed.
|
||
* @param result buffer to store result in. If NULL, number of bytes needed
|
||
* will be returned.
|
||
* @param resultLength length of the result buffer. If if not enough the
|
||
* buffer will be filled to capacity.
|
||
* @return Number of bytes needed for storing the sort key
|
||
* @stable ICU 2.2
|
||
*/
|
||
virtual int32_t getSortKey(const UnicodeString& source,
|
||
uint8_t* result,
|
||
int32_t resultLength) const = 0;
|
||
|
||
/**
|
||
* Get the sort key as an array of bytes from an UChar buffer.
|
||
* Sort key byte arrays are zero-terminated and can be compared using
|
||
* strcmp().
|
||
* @param source string to be processed.
|
||
* @param sourceLength length of string to be processed.
|
||
* If -1, the string is 0 terminated and length will be decided by the
|
||
* function.
|
||
* @param result buffer to store result in. If NULL, number of bytes needed
|
||
* will be returned.
|
||
* @param resultLength length of the result buffer. If if not enough the
|
||
* buffer will be filled to capacity.
|
||
* @return Number of bytes needed for storing the sort key
|
||
* @stable ICU 2.2
|
||
*/
|
||
virtual int32_t getSortKey(const UChar*source, int32_t sourceLength,
|
||
uint8_t*result, int32_t resultLength) const = 0;
|
||
|
||
/**
|
||
* Produce a bound for a given sortkey and a number of levels.
|
||
* Return value is always the number of bytes needed, regardless of
|
||
* whether the result buffer was big enough or even valid.<br>
|
||
* Resulting bounds can be used to produce a range of strings that are
|
||
* between upper and lower bounds. For example, if bounds are produced
|
||
* for a sortkey of string "smith", strings between upper and lower
|
||
* bounds with one level would include "Smith", "SMITH", "sMiTh".<br>
|
||
* There are two upper bounds that can be produced. If UCOL_BOUND_UPPER
|
||
* is produced, strings matched would be as above. However, if bound
|
||
* produced using UCOL_BOUND_UPPER_LONG is used, the above example will
|
||
* also match "Smithsonian" and similar.<br>
|
||
* For more on usage, see example in cintltst/capitst.c in procedure
|
||
* TestBounds.
|
||
* Sort keys may be compared using <TT>strcmp</TT>.
|
||
* @param source The source sortkey.
|
||
* @param sourceLength The length of source, or -1 if null-terminated.
|
||
* (If an unmodified sortkey is passed, it is always null
|
||
* terminated).
|
||
* @param boundType Type of bound required. It can be UCOL_BOUND_LOWER, which
|
||
* produces a lower inclusive bound, UCOL_BOUND_UPPER, that
|
||
* produces upper bound that matches strings of the same length
|
||
* or UCOL_BOUND_UPPER_LONG that matches strings that have the
|
||
* same starting substring as the source string.
|
||
* @param noOfLevels Number of levels required in the resulting bound (for most
|
||
* uses, the recommended value is 1). See users guide for
|
||
* explanation on number of levels a sortkey can have.
|
||
* @param result A pointer to a buffer to receive the resulting sortkey.
|
||
* @param resultLength The maximum size of result.
|
||
* @param status Used for returning error code if something went wrong. If the
|
||
* number of levels requested is higher than the number of levels
|
||
* in the source key, a warning (U_SORT_KEY_TOO_SHORT_WARNING) is
|
||
* issued.
|
||
* @return The size needed to fully store the bound.
|
||
* @see ucol_keyHashCode
|
||
* @stable ICU 2.1
|
||
*/
|
||
static int32_t getBound(const uint8_t *source,
|
||
int32_t sourceLength,
|
||
UColBoundMode boundType,
|
||
uint32_t noOfLevels,
|
||
uint8_t *result,
|
||
int32_t resultLength,
|
||
UErrorCode &status);
|
||
|
||
|
||
protected:
|
||
|
||
// Collator protected constructors -------------------------------------
|
||
|
||
/**
|
||
* Default constructor.
|
||
* Constructor is different from the old default Collator constructor.
|
||
* The task for determing the default collation strength and normalization
|
||
* mode is left to the child class.
|
||
* @stable ICU 2.0
|
||
*/
|
||
Collator();
|
||
|
||
/**
|
||
* Constructor.
|
||
* Empty constructor, does not handle the arguments.
|
||
* This constructor is done for backward compatibility with 1.7 and 1.8.
|
||
* The task for handling the argument collation strength and normalization
|
||
* mode is left to the child class.
|
||
* @param collationStrength collation strength
|
||
* @param decompositionMode
|
||
* @deprecated ICU 2.4. Subclasses should use the default constructor
|
||
* instead and handle the strength and normalization mode themselves.
|
||
*/
|
||
Collator(UCollationStrength collationStrength,
|
||
UNormalizationMode decompositionMode);
|
||
|
||
/**
|
||
* Copy constructor.
|
||
* @param other Collator object to be copied from
|
||
* @stable ICU 2.0
|
||
*/
|
||
Collator(const Collator& other);
|
||
|
||
// Collator protected methods -----------------------------------------
|
||
|
||
|
||
/**
|
||
* Used internally by registraton to define the requested and valid locales.
|
||
* @param requestedLocale the requsted locale
|
||
* @param validLocale the valid locale
|
||
* @internal
|
||
*/
|
||
virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale);
|
||
|
||
public:
|
||
/**
|
||
* used only by ucol_open, not for public use
|
||
* @internal
|
||
*/
|
||
static UCollator* createUCollator(const char* loc, UErrorCode* status);
|
||
|
||
private:
|
||
/**
|
||
* Assignment operator. Private for now.
|
||
* @internal
|
||
*/
|
||
Collator& operator=(const Collator& other);
|
||
|
||
friend class CFactory;
|
||
friend class SimpleCFactory;
|
||
friend class ICUCollatorFactory;
|
||
friend class ICUCollatorService;
|
||
static Collator* makeInstance(const Locale& desiredLocale,
|
||
UErrorCode& status);
|
||
|
||
// Collator private data members ---------------------------------------
|
||
|
||
/*
|
||
synwee : removed as attributes to be handled by child class
|
||
UCollationStrength strength;
|
||
Normalizer::EMode decmp;
|
||
*/
|
||
/* This is useless information */
|
||
/* static const UVersionInfo fVersion;*/
|
||
};
|
||
|
||
/**
|
||
* A factory, used with registerFactory, the creates multiple collators and provides
|
||
* display names for them. A factory supports some number of locales-- these are the
|
||
* locales for which it can create collators. The factory can be visible, in which
|
||
* case the supported locales will be enumerated by getAvailableLocales, or invisible,
|
||
* in which they are not. Invisible locales are still supported, they are just not
|
||
* listed by getAvailableLocales.
|
||
* <p>
|
||
* If standard locale display names are sufficient, Collator instances can
|
||
* be registered using registerInstance instead.</p>
|
||
* <p>
|
||
* Note: if the collators are to be used from C APIs, they must be instances
|
||
* of RuleBasedCollator.</p>
|
||
*
|
||
* @draft ICU 2.6
|
||
*/
|
||
class U_I18N_API CollatorFactory : public UObject {
|
||
public:
|
||
|
||
/**
|
||
* Return true if this factory is visible. Default is true.
|
||
* If not visible, the locales supported by this factory will not
|
||
* be listed by getAvailableLocales.
|
||
* @return true if the factory is visible.
|
||
@draft ICU 2.6
|
||
*/
|
||
virtual UBool visible(void) const;
|
||
|
||
/**
|
||
* Return a collator for the provided locale. If the locale
|
||
* is not supported, return NULL.
|
||
* @param loc the locale identifying the collator to be created.
|
||
* @return a new collator if the locale is supported, otherwise NULL.
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual Collator* createCollator(const Locale& loc) = 0;
|
||
|
||
/**
|
||
* Return the name of the collator for the objectLocale, localized for the displayLocale.
|
||
* If objectLocale is not supported, or the factory is not visible, set the result string
|
||
* to bogus.
|
||
* @param objectLocale the locale identifying the collator
|
||
* @param displayLocale the locale for which the display name of the collator should be localized
|
||
* @param result an output parameter for the display name, set to bogus if not supported.
|
||
* @return the display name
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual UnicodeString& getDisplayName(const Locale& objectLocale,
|
||
const Locale& displayLocale,
|
||
UnicodeString& result);
|
||
|
||
/**
|
||
* Return an array of all the locale names directly supported by this factory.
|
||
* The number of names is returned in count. This array is owned by the factory.
|
||
* Its contents must never change.
|
||
* @param count output parameter for the number of locales supported by the factory
|
||
* @param status the in/out error code
|
||
* @return a pointer to an array of count UnicodeStrings.
|
||
* @draft ICU 2.6
|
||
*/
|
||
virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) = 0;
|
||
};
|
||
|
||
// Collator inline methods -----------------------------------------------
|
||
|
||
/*
|
||
synwee : removed since there's no attribute to be retrieved here
|
||
inline UCollationStrength Collator::getStrength() const
|
||
{
|
||
return strength;
|
||
}
|
||
|
||
inline Normalizer::EMode Collator::getDecomposition() const
|
||
{
|
||
return decmp;
|
||
}
|
||
*/
|
||
U_NAMESPACE_END
|
||
|
||
#endif /* #if !UCONFIG_NO_COLLATION */
|
||
|
||
#endif
|