com.ibm.icu.text.RuleBasedCollator Maven / Gradle / Ivy
Show all versions of virtdata-lib-realer Show documentation
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/**
*******************************************************************************
* Copyright (C) 1996-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.text;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.CharacterIterator;
import java.text.ParseException;
import java.util.Arrays;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import com.ibm.icu.impl.ClassLoaderUtil;
import com.ibm.icu.impl.Normalizer2Impl;
import com.ibm.icu.impl.Normalizer2Impl.ReorderingBuffer;
import com.ibm.icu.impl.Utility;
import com.ibm.icu.impl.coll.BOCSU;
import com.ibm.icu.impl.coll.Collation;
import com.ibm.icu.impl.coll.CollationCompare;
import com.ibm.icu.impl.coll.CollationData;
import com.ibm.icu.impl.coll.CollationFastLatin;
import com.ibm.icu.impl.coll.CollationIterator;
import com.ibm.icu.impl.coll.CollationKeys;
import com.ibm.icu.impl.coll.CollationKeys.SortKeyByteSink;
import com.ibm.icu.impl.coll.CollationLoader;
import com.ibm.icu.impl.coll.CollationRoot;
import com.ibm.icu.impl.coll.CollationSettings;
import com.ibm.icu.impl.coll.CollationTailoring;
import com.ibm.icu.impl.coll.ContractionsAndExpansions;
import com.ibm.icu.impl.coll.FCDUTF16CollationIterator;
import com.ibm.icu.impl.coll.SharedObject;
import com.ibm.icu.impl.coll.TailoredSet;
import com.ibm.icu.impl.coll.UTF16CollationIterator;
import com.ibm.icu.lang.UScript;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.VersionInfo;
/**
*
* RuleBasedCollator is a concrete subclass of Collator. It allows customization of the Collator via user-specified rule
* sets. RuleBasedCollator is designed to be fully compliant to the Unicode Collation Algorithm (UCA) and conforms to ISO 14651.
*
*
A Collator is thread-safe only when frozen. See {{@link #isFrozen()} and {@link com.ibm.icu.util.Freezable}.
*
*
* Users are strongly encouraged to read the User
* Guide for more information about the collation service before using this class.
*
*
* Create a RuleBasedCollator from a locale by calling the getInstance(Locale) factory method in the base class
* Collator. Collator.getInstance(Locale) creates a RuleBasedCollator object based on the collation rules defined by the
* argument locale. If a customized collation ordering or attributes is required, use the RuleBasedCollator(String)
* constructor with the appropriate rules. The customized RuleBasedCollator will base its ordering on the CLDR root collation, while
* re-adjusting the attributes and orders of the characters in the specified rule accordingly.
*
*
* RuleBasedCollator provides correct collation orders for most locales supported in ICU. If specific data for a locale
* is not available, the orders eventually falls back to the
* CLDR root sort order.
*
*
* For information about the collation rule syntax and details about customization, please refer to the Collation customization section of the
* User Guide.
*
*
* Note that there are some differences between the Collation rule syntax used in Java and ICU4J:
*
*
* - According to the JDK documentation:
* Modifier '!' : Turns on Thai/Lao vowel-consonant swapping. If this rule is in force when a Thai vowel of the range
* \U0E40-\U0E44 precedes a Thai consonant of the range \U0E01-\U0E2E OR a Lao vowel of the range
* \U0EC0-\U0EC4 precedes a Lao consonant of the range \U0E81-\U0EAE then the vowel is placed after the
* consonant for collation purposes.
*
* If a rule is without the modifier '!', the Thai/Lao vowel-consonant swapping is not turned on.
*
*
* ICU4J's RuleBasedCollator does not support turning off the Thai/Lao vowel-consonant swapping, since the UCA clearly
* states that it has to be supported to ensure a correct sorting order. If a '!' is encountered, it is ignored.
* - As mentioned in the documentation of the base class Collator, compatibility decomposition mode is not supported.
*
*
* Examples
*
* Creating Customized RuleBasedCollators:
*
*
* String simple = "& a < b < c < d";
* RuleBasedCollator simpleCollator = new RuleBasedCollator(simple);
*
* String norwegian = "& a , A < b , B < c , C < d , D < e , E "
* + "< f , F < g , G < h , H < i , I < j , "
* + "J < k , K < l , L < m , M < n , N < "
* + "o , O < p , P < q , Q <r , R <s , S < "
* + "t , T < u , U < v , V < w , W < x , X "
* + "< y , Y < z , Z < \u00E5 = a\u030A "
* + ", \u00C5 = A\u030A ; aa , AA < \u00E6 "
* + ", \u00C6 < \u00F8 , \u00D8";
* RuleBasedCollator norwegianCollator = new RuleBasedCollator(norwegian);
*
*
*
*
* Concatenating rules to combine Collators:
*
*
* // Create an en_US Collator object
* RuleBasedCollator en_USCollator = (RuleBasedCollator)
* Collator.getInstance(new Locale("en", "US", ""));
* // Create a da_DK Collator object
* RuleBasedCollator da_DKCollator = (RuleBasedCollator)
* Collator.getInstance(new Locale("da", "DK", ""));
* // Combine the two
* // First, get the collation rules from en_USCollator
* String en_USRules = en_USCollator.getRules();
* // Second, get the collation rules from da_DKCollator
* String da_DKRules = da_DKCollator.getRules();
* RuleBasedCollator newCollator =
* new RuleBasedCollator(en_USRules + da_DKRules);
* // newCollator has the combined rules
*
*
*
*
* Making changes to an existing RuleBasedCollator to create a new Collator object, by appending changes to
* the existing rule:
*
*
* // Create a new Collator object with additional rules
* String addRules = "& C < ch, cH, Ch, CH";
* RuleBasedCollator myCollator =
* new RuleBasedCollator(en_USCollator.getRules() + addRules);
* // myCollator contains the new rules
*
*
*
*
* How to change the order of non-spacing accents:
*
*
* // old rule with main accents
* String oldRules = "= \u0301 ; \u0300 ; \u0302 ; \u0308 "
* + "; \u0327 ; \u0303 ; \u0304 ; \u0305 "
* + "; \u0306 ; \u0307 ; \u0309 ; \u030A "
* + "; \u030B ; \u030C ; \u030D ; \u030E "
* + "; \u030F ; \u0310 ; \u0311 ; \u0312 "
* + "< a , A ; ae, AE ; \u00e6 , \u00c6 "
* + "< b , B < c, C < e, E & C < d , D";
* // change the order of accent characters
* String addOn = "& \u0300 ; \u0308 ; \u0302";
* RuleBasedCollator myCollator = new RuleBasedCollator(oldRules + addOn);
*
*
*
*
* Putting in a new primary ordering before the default setting, e.g. sort English characters before or after Japanese
* characters in the Japanese Collator:
*
*
* // get en_US Collator rules
* RuleBasedCollator en_USCollator
* = (RuleBasedCollator)Collator.getInstance(Locale.US);
* // add a few Japanese characters to sort before English characters
* // suppose the last character before the first base letter 'a' in
* // the English collation rule is \u2212
* String jaString = "& \u2212 <\u3041, \u3042 <\u3043, "
* + "\u3044";
* RuleBasedCollator myJapaneseCollator
* = new RuleBasedCollator(en_USCollator.getRules() + jaString);
*
*
*
*
* This class is not subclassable
*
* @author Syn Wee Quek
* @stable ICU 2.8
*/
public final class RuleBasedCollator extends Collator {
// public constructors ---------------------------------------------------
/**
*
* Constructor that takes the argument rules for customization.
* The collator will be based on the CLDR root collation, with the
* attributes and re-ordering of the characters specified in the argument rules.
*
* See the User Guide's section on
* Collation Customization for details on the rule syntax.
*
* @param rules
* the collation rules to build the collation table from.
* @exception ParseException
* and IOException thrown. ParseException thrown when argument rules have an invalid syntax.
* IOException thrown when an error occurred while reading internal data.
* @stable ICU 2.8
*/
public RuleBasedCollator(String rules) throws Exception {
if (rules == null) {
throw new IllegalArgumentException("Collation rules can not be null");
}
validLocale = ULocale.ROOT;
internalBuildTailoring(rules);
}
/**
* Implements from-rule constructors.
* @param rules rule string
* @throws Exception
*/
private final void internalBuildTailoring(String rules) throws Exception {
CollationTailoring base = CollationRoot.getRoot();
// Most code using Collator does not need to build a Collator from rules.
// By using reflection, most code will not have a static dependency on the builder code.
// CollationBuilder builder = new CollationBuilder(base);
ClassLoader classLoader = ClassLoaderUtil.getClassLoader(getClass());
CollationTailoring t;
try {
Class builderClass = classLoader.loadClass("com.ibm.icu.impl.coll.CollationBuilder");
Object builder = builderClass.getConstructor(CollationTailoring.class).newInstance(base);
// builder.parseAndBuild(rules);
Method parseAndBuild = builderClass.getMethod("parseAndBuild", String.class);
t = (CollationTailoring)parseAndBuild.invoke(builder, rules);
} catch(InvocationTargetException e) {
throw (Exception)e.getTargetException();
}
t.actualLocale = null;
adoptTailoring(t);
}
// public methods --------------------------------------------------------
/**
* Clones the RuleBasedCollator
*
* @return a new instance of this RuleBasedCollator object
* @stable ICU 2.8
*/
@Override
public Object clone() throws CloneNotSupportedException {
if (isFrozen()) {
return this;
}
return cloneAsThawed();
}
private final void initMaxExpansions() {
synchronized(tailoring) {
if (tailoring.maxExpansions == null) {
tailoring.maxExpansions = CollationElementIterator.computeMaxExpansions(tailoring.data);
}
}
}
/**
* Return a CollationElementIterator for the given String.
*
* @see CollationElementIterator
* @stable ICU 2.8
*/
public CollationElementIterator getCollationElementIterator(String source) {
initMaxExpansions();
return new CollationElementIterator(source, this);
}
/**
* Return a CollationElementIterator for the given CharacterIterator. The source iterator's integrity will be
* preserved since a new copy will be created for use.
*
* @see CollationElementIterator
* @stable ICU 2.8
*/
public CollationElementIterator getCollationElementIterator(CharacterIterator source) {
initMaxExpansions();
CharacterIterator newsource = (CharacterIterator) source.clone();
return new CollationElementIterator(newsource, this);
}
/**
* Return a CollationElementIterator for the given UCharacterIterator. The source iterator's integrity will be
* preserved since a new copy will be created for use.
*
* @see CollationElementIterator
* @stable ICU 2.8
*/
public CollationElementIterator getCollationElementIterator(UCharacterIterator source) {
initMaxExpansions();
return new CollationElementIterator(source, this);
}
// Freezable interface implementation -------------------------------------------------
/**
* Determines whether the object has been frozen or not.
*
*
An unfrozen Collator is mutable and not thread-safe.
* A frozen Collator is immutable and thread-safe.
*
* @stable ICU 4.8
*/
@Override
public boolean isFrozen() {
return frozenLock != null;
}
/**
* Freezes the collator.
* @return the collator itself.
* @stable ICU 4.8
*/
@Override
public Collator freeze() {
if (!isFrozen()) {
frozenLock = new ReentrantLock();
if (collationBuffer == null) {
collationBuffer = new CollationBuffer(data);
}
}
return this;
}
/**
* Provides for the clone operation. Any clone is initially unfrozen.
* @stable ICU 4.8
*/
@Override
public RuleBasedCollator cloneAsThawed() {
try {
RuleBasedCollator result = (RuleBasedCollator) super.clone();
// since all collation data in the RuleBasedCollator do not change
// we can safely assign the result.fields to this collator
// except in cases where we can't
result.settings = settings.clone();
result.collationBuffer = null;
result.frozenLock = null;
return result;
} catch (CloneNotSupportedException e) {
// Clone is implemented
return null;
}
}
// public setters --------------------------------------------------------
private void checkNotFrozen() {
if (isFrozen()) {
throw new UnsupportedOperationException("Attempt to modify frozen RuleBasedCollator");
}
}
private final CollationSettings getOwnedSettings() {
return settings.copyOnWrite();
}
private final CollationSettings getDefaultSettings() {
return tailoring.settings.readOnly();
}
/**
* Sets the Hiragana Quaternary mode to be on or off. When the Hiragana Quaternary mode is turned on, the collator
* positions Hiragana characters before all non-ignorable characters in QUATERNARY strength. This is to produce a
* correct JIS collation order, distinguishing between Katakana and Hiragana characters.
*
*
This attribute was an implementation detail of the CLDR Japanese tailoring.
* Since ICU 50, this attribute is not settable any more via API functions.
* Since CLDR 25/ICU 53, explicit quaternary relations are used
* to achieve the same Japanese sort order.
*
* @param flag
* true if Hiragana Quaternary mode is to be on, false otherwise
* @see #setHiraganaQuaternaryDefault
* @see #isHiraganaQuaternary
* @deprecated ICU 50 Implementation detail, cannot be set via API, was removed from implementation.
*/
@Deprecated
public void setHiraganaQuaternary(boolean flag) {
checkNotFrozen();
}
/**
* Sets the Hiragana Quaternary mode to the initial mode set during construction of the RuleBasedCollator. See
* setHiraganaQuaternary(boolean) for more details.
*
*
This attribute was an implementation detail of the CLDR Japanese tailoring.
* Since ICU 50, this attribute is not settable any more via API functions.
* Since CLDR 25/ICU 53, explicit quaternary relations are used
* to achieve the same Japanese sort order.
*
* @see #setHiraganaQuaternary(boolean)
* @see #isHiraganaQuaternary
* @deprecated ICU 50 Implementation detail, cannot be set via API, was removed from implementation.
*/
@Deprecated
public void setHiraganaQuaternaryDefault() {
checkNotFrozen();
}
/**
* Sets whether uppercase characters sort before lowercase characters or vice versa, in strength TERTIARY. The
* default mode is false, and so lowercase characters sort before uppercase characters. If true, sort upper case
* characters first.
*
* @param upperfirst
* true to sort uppercase characters before lowercase characters, false to sort lowercase characters
* before uppercase characters
* @see #isLowerCaseFirst
* @see #isUpperCaseFirst
* @see #setLowerCaseFirst
* @see #setCaseFirstDefault
* @stable ICU 2.8
*/
public void setUpperCaseFirst(boolean upperfirst) {
checkNotFrozen();
if (upperfirst == isUpperCaseFirst()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setCaseFirst(upperfirst ? CollationSettings.CASE_FIRST_AND_UPPER_MASK : 0);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the orders of lower cased characters to sort before upper cased characters, in strength TERTIARY. The
* default mode is false. If true is set, the RuleBasedCollator will sort lower cased characters before the upper
* cased ones. Otherwise, if false is set, the RuleBasedCollator will ignore case preferences.
*
* @param lowerfirst
* true for sorting lower cased characters before upper cased characters, false to ignore case
* preferences.
* @see #isLowerCaseFirst
* @see #isUpperCaseFirst
* @see #setUpperCaseFirst
* @see #setCaseFirstDefault
* @stable ICU 2.8
*/
public void setLowerCaseFirst(boolean lowerfirst) {
checkNotFrozen();
if (lowerfirst == isLowerCaseFirst()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setCaseFirst(lowerfirst ? CollationSettings.CASE_FIRST : 0);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the case first mode to the initial mode set during construction of the RuleBasedCollator. See
* setUpperCaseFirst(boolean) and setLowerCaseFirst(boolean) for more details.
*
* @see #isLowerCaseFirst
* @see #isUpperCaseFirst
* @see #setLowerCaseFirst(boolean)
* @see #setUpperCaseFirst(boolean)
* @stable ICU 2.8
*/
public final void setCaseFirstDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setCaseFirstDefault(defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the alternate handling mode to the initial mode set during construction of the RuleBasedCollator. See
* setAlternateHandling(boolean) for more details.
*
* @see #setAlternateHandlingShifted(boolean)
* @see #isAlternateHandlingShifted()
* @stable ICU 2.8
*/
public void setAlternateHandlingDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setAlternateHandlingDefault(defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the case level mode to the initial mode set during construction of the RuleBasedCollator. See
* setCaseLevel(boolean) for more details.
*
* @see #setCaseLevel(boolean)
* @see #isCaseLevel
* @stable ICU 2.8
*/
public void setCaseLevelDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlagDefault(CollationSettings.CASE_LEVEL, defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the decomposition mode to the initial mode set during construction of the RuleBasedCollator. See
* setDecomposition(int) for more details.
*
* @see #getDecomposition
* @see #setDecomposition(int)
* @stable ICU 2.8
*/
public void setDecompositionDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlagDefault(CollationSettings.CHECK_FCD, defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the French collation mode to the initial mode set during construction of the RuleBasedCollator. See
* setFrenchCollation(boolean) for more details.
*
* @see #isFrenchCollation
* @see #setFrenchCollation(boolean)
* @stable ICU 2.8
*/
public void setFrenchCollationDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlagDefault(CollationSettings.BACKWARD_SECONDARY, defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the collation strength to the initial mode set during the construction of the RuleBasedCollator. See
* setStrength(int) for more details.
*
* @see #setStrength(int)
* @see #getStrength
* @stable ICU 2.8
*/
public void setStrengthDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setStrengthDefault(defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Method to set numeric collation to its default value.
*
* @see #getNumericCollation
* @see #setNumericCollation
* @stable ICU 2.8
*/
public void setNumericCollationDefault() {
checkNotFrozen();
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlagDefault(CollationSettings.NUMERIC, defaultSettings.options);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the mode for the direction of SECONDARY weights to be used in French collation. The default value is false,
* which treats SECONDARY weights in the order they appear. If set to true, the SECONDARY weights will be sorted
* backwards. See the section on
* French collation for more information.
*
* @param flag
* true to set the French collation on, false to set it off
* @stable ICU 2.8
* @see #isFrenchCollation
* @see #setFrenchCollationDefault
*/
public void setFrenchCollation(boolean flag) {
checkNotFrozen();
if(flag == isFrenchCollation()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlag(CollationSettings.BACKWARD_SECONDARY, flag);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the alternate handling for QUATERNARY strength to be either shifted or non-ignorable. See the UCA definition
* on Variable Weighting. This
* attribute will only be effective when QUATERNARY strength is set. The default value for this mode is false,
* corresponding to the NON_IGNORABLE mode in UCA. In the NON_IGNORABLE mode, the RuleBasedCollator treats all
* the code points with non-ignorable primary weights in the same way. If the mode is set to true, the behavior
* corresponds to SHIFTED defined in UCA, this causes code points with PRIMARY orders that are equal or below the
* variable top value to be ignored in PRIMARY order and moved to the QUATERNARY order.
*
* @param shifted
* true if SHIFTED behavior for alternate handling is desired, false for the NON_IGNORABLE behavior.
* @see #isAlternateHandlingShifted
* @see #setAlternateHandlingDefault
* @stable ICU 2.8
*/
public void setAlternateHandlingShifted(boolean shifted) {
checkNotFrozen();
if(shifted == isAlternateHandlingShifted()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setAlternateHandlingShifted(shifted);
setFastLatinOptions(ownedSettings);
}
/**
*
* When case level is set to true, an additional weight is formed between the SECONDARY and TERTIARY weight, known
* as the case level. The case level is used to distinguish large and small Japanese Kana characters. Case level
* could also be used in other situations. For example to distinguish certain Pinyin characters. The default value
* is false, which means the case level is not generated. The contents of the case level are affected by the case
* first mode. A simple way to ignore accent differences in a string is to set the strength to PRIMARY and enable
* case level.
*
* See the section on case
* level for more information.
*
* @param flag
* true if case level sorting is required, false otherwise
* @stable ICU 2.8
* @see #setCaseLevelDefault
* @see #isCaseLevel
*/
public void setCaseLevel(boolean flag) {
checkNotFrozen();
if(flag == isCaseLevel()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlag(CollationSettings.CASE_LEVEL, flag);
setFastLatinOptions(ownedSettings);
}
/**
* Sets the decomposition mode of this Collator. Setting this
* decomposition attribute with CANONICAL_DECOMPOSITION allows the
* Collator to handle un-normalized text properly, producing the
* same results as if the text were normalized. If
* NO_DECOMPOSITION is set, it is the user's responsibility to
* insure that all text is already in the appropriate form before
* a comparison or before getting a CollationKey. Adjusting
* decomposition mode allows the user to select between faster and
* more complete collation behavior.
*
*
Since a great many of the world's languages do not require
* text normalization, most locales set NO_DECOMPOSITION as the
* default decomposition mode.
*
* The default decompositon mode for the Collator is
* NO_DECOMPOSITON, unless specified otherwise by the locale used
* to create the Collator.
*
*
See getDecomposition for a description of decomposition
* mode.
*
* @param decomposition the new decomposition mode
* @see #getDecomposition
* @see #NO_DECOMPOSITION
* @see #CANONICAL_DECOMPOSITION
* @throws IllegalArgumentException If the given value is not a valid
* decomposition mode.
* @stable ICU 2.8
*/
@Override
public void setDecomposition(int decomposition)
{
checkNotFrozen();
boolean flag;
switch(decomposition) {
case NO_DECOMPOSITION:
flag = false;
break;
case CANONICAL_DECOMPOSITION:
flag = true;
break;
default:
throw new IllegalArgumentException("Wrong decomposition mode.");
}
if(flag == settings.readOnly().getFlag(CollationSettings.CHECK_FCD)) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlag(CollationSettings.CHECK_FCD, flag);
setFastLatinOptions(ownedSettings);
}
/**
* Sets this Collator's strength attribute. The strength attribute determines the minimum level of difference
* considered significant during comparison.
*
*
See the Collator class description for an example of use.
*
* @param newStrength
* the new strength value.
* @see #getStrength
* @see #setStrengthDefault
* @see #PRIMARY
* @see #SECONDARY
* @see #TERTIARY
* @see #QUATERNARY
* @see #IDENTICAL
* @exception IllegalArgumentException
* If the new strength value is not one of PRIMARY, SECONDARY, TERTIARY, QUATERNARY or IDENTICAL.
* @stable ICU 2.8
*/
@Override
public void setStrength(int newStrength) {
checkNotFrozen();
if(newStrength == getStrength()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setStrength(newStrength);
setFastLatinOptions(ownedSettings);
}
/**
* {@icu} Sets the variable top to the top of the specified reordering group.
* The variable top determines the highest-sorting character
* which is affected by the alternate handling behavior.
* If that attribute is set to NON_IGNORABLE, then the variable top has no effect.
* @param group one of Collator.ReorderCodes.SPACE, Collator.ReorderCodes.PUNCTUATION,
* Collator.ReorderCodes.SYMBOL, Collator.ReorderCodes.CURRENCY;
* or Collator.ReorderCodes.DEFAULT to restore the default max variable group
* @return this
* @see #getMaxVariable
* @stable ICU 53
*/
@Override
public RuleBasedCollator setMaxVariable(int group) {
// Convert the reorder code into a MaxVariable number, or UCOL_DEFAULT=-1.
int value;
if(group == Collator.ReorderCodes.DEFAULT) {
value = -1; // UCOL_DEFAULT
} else if(Collator.ReorderCodes.FIRST <= group && group <= Collator.ReorderCodes.CURRENCY) {
value = group - Collator.ReorderCodes.FIRST;
} else {
throw new IllegalArgumentException("illegal max variable group " + group);
}
int oldValue = settings.readOnly().getMaxVariable();
if(value == oldValue) {
return this;
}
CollationSettings defaultSettings = getDefaultSettings();
if(settings.readOnly() == defaultSettings) {
if(value < 0) { // UCOL_DEFAULT
return this;
}
}
CollationSettings ownedSettings = getOwnedSettings();
if(group == Collator.ReorderCodes.DEFAULT) {
group = Collator.ReorderCodes.FIRST + defaultSettings.getMaxVariable();
}
long varTop = data.getLastPrimaryForGroup(group);
assert(varTop != 0);
ownedSettings.setMaxVariable(value, defaultSettings.options);
ownedSettings.variableTop = varTop;
setFastLatinOptions(ownedSettings);
return this;
}
/**
* {@icu} Returns the maximum reordering group whose characters are affected by
* the alternate handling behavior.
* @return the maximum variable reordering group.
* @see #setMaxVariable
* @stable ICU 53
*/
@Override
public int getMaxVariable() {
return Collator.ReorderCodes.FIRST + settings.readOnly().getMaxVariable();
}
/**
* {@icu} Sets the variable top to the primary weight of the specified string.
*
*
Beginning with ICU 53, the variable top is pinned to
* the top of one of the supported reordering groups,
* and it must not be beyond the last of those groups.
* See {@link #setMaxVariable(int)}.
*
* @param varTop
* one or more (if contraction) characters to which the variable top should be set
* @return variable top primary weight
* @exception IllegalArgumentException
* is thrown if varTop argument is not a valid variable top element. A variable top element is
* invalid when
*
* - it is a contraction that does not exist in the Collation order
*
- the variable top is beyond
* the last reordering group supported by setMaxVariable()
*
- when the varTop argument is null or zero in length.
*
* @see #getVariableTop
* @see RuleBasedCollator#setAlternateHandlingShifted
* @deprecated ICU 53 Call {@link #setMaxVariable(int)} instead.
*/
@Override
@Deprecated
public int setVariableTop(String varTop) {
checkNotFrozen();
if (varTop == null || varTop.length() == 0) {
throw new IllegalArgumentException("Variable top argument string can not be null or zero in length.");
}
boolean numeric = settings.readOnly().isNumeric();
long ce1, ce2;
if(settings.readOnly().dontCheckFCD()) {
UTF16CollationIterator ci = new UTF16CollationIterator(data, numeric, varTop, 0);
ce1 = ci.nextCE();
ce2 = ci.nextCE();
} else {
FCDUTF16CollationIterator ci = new FCDUTF16CollationIterator(data, numeric, varTop, 0);
ce1 = ci.nextCE();
ce2 = ci.nextCE();
}
if(ce1 == Collation.NO_CE || ce2 != Collation.NO_CE) {
throw new IllegalArgumentException("Variable top argument string must map to exactly one collation element");
}
internalSetVariableTop(ce1 >>> 32);
return (int)settings.readOnly().variableTop;
}
/**
* {@icu} Sets the variable top to the specified primary weight.
*
* Beginning with ICU 53, the variable top is pinned to
* the top of one of the supported reordering groups,
* and it must not be beyond the last of those groups.
* See {@link #setMaxVariable(int)}.
*
* @param varTop primary weight, as returned by setVariableTop or getVariableTop
* @see #getVariableTop
* @see #setVariableTop(String)
* @deprecated ICU 53 Call setMaxVariable() instead.
*/
@Override
@Deprecated
public void setVariableTop(int varTop) {
checkNotFrozen();
internalSetVariableTop(varTop & 0xffffffffL);
}
private void internalSetVariableTop(long varTop) {
if(varTop != settings.readOnly().variableTop) {
// Pin the variable top to the end of the reordering group which contains it.
// Only a few special groups are supported.
int group = data.getGroupForPrimary(varTop);
if(group < Collator.ReorderCodes.FIRST || Collator.ReorderCodes.CURRENCY < group) {
throw new IllegalArgumentException("The variable top must be a primary weight in " +
"the space/punctuation/symbols/currency symbols range");
}
long v = data.getLastPrimaryForGroup(group);
assert(v != 0 && v >= varTop);
varTop = v;
if(varTop != settings.readOnly().variableTop) {
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setMaxVariable(group - Collator.ReorderCodes.FIRST,
getDefaultSettings().options);
ownedSettings.variableTop = varTop;
setFastLatinOptions(ownedSettings);
}
}
}
/**
* {@icu} When numeric collation is turned on, this Collator makes
* substrings of digits sort according to their numeric values.
*
*
This is a way to get '100' to sort AFTER '2'. Note that the longest
* digit substring that can be treated as a single unit is
* 254 digits (not counting leading zeros). If a digit substring is
* longer than that, the digits beyond the limit will be treated as a
* separate digit substring.
*
*
A "digit" in this sense is a code point with General_Category=Nd,
* which does not include circled numbers, roman numerals, etc.
* Only a contiguous digit substring is considered, that is,
* non-negative integers without separators.
* There is no support for plus/minus signs, decimals, exponents, etc.
*
* @param flag
* true to turn numeric collation on and false to turn it off
* @see #getNumericCollation
* @see #setNumericCollationDefault
* @stable ICU 2.8
*/
public void setNumericCollation(boolean flag) {
checkNotFrozen();
// sort substrings of digits as numbers
if(flag == getNumericCollation()) { return; }
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.setFlag(CollationSettings.NUMERIC, flag);
setFastLatinOptions(ownedSettings);
}
/**
* {@inheritDoc}
*
* @param order the reordering codes to apply to this collator; if this is null or an empty array
* then this clears any existing reordering
* @throws IllegalArgumentException if the reordering codes are malformed in any way (e.g. duplicates, multiple reset codes, overlapping equivalent scripts)
* @see #getReorderCodes
* @see Collator#getEquivalentReorderCodes
* @see Collator.ReorderCodes
* @see UScript
* @stable ICU 4.8
*/
@Override
public void setReorderCodes(int... order) {
checkNotFrozen();
int length = (order != null) ? order.length : 0;
if(length == 1 && order[0] == ReorderCodes.NONE) {
length = 0;
}
if(length == 0 ?
settings.readOnly().reorderCodes.length == 0 :
Arrays.equals(order, settings.readOnly().reorderCodes)) {
return;
}
CollationSettings defaultSettings = getDefaultSettings();
if(length == 1 && order[0] == Collator.ReorderCodes.DEFAULT) {
if(settings.readOnly() != defaultSettings) {
CollationSettings ownedSettings = getOwnedSettings();
ownedSettings.copyReorderingFrom(defaultSettings);
setFastLatinOptions(ownedSettings);
}
return;
}
CollationSettings ownedSettings = getOwnedSettings();
if(length == 0) {
ownedSettings.resetReordering();
} else {
ownedSettings.setReordering(data, order.clone());
}
setFastLatinOptions(ownedSettings);
}
private void setFastLatinOptions(CollationSettings ownedSettings) {
ownedSettings.fastLatinOptions = CollationFastLatin.getOptions(
data, ownedSettings, ownedSettings.fastLatinPrimaries);
}
// public getters --------------------------------------------------------
/**
* Gets the collation tailoring rules for this RuleBasedCollator.
* Equivalent to String getRules(false).
*
* @return the collation tailoring rules
* @see #getRules(boolean)
* @stable ICU 2.8
*/
public String getRules() {
return tailoring.getRules();
}
/**
* Returns current rules.
* The argument defines whether full rules (root collation + tailored) rules are returned
* or just the tailoring.
*
*
The root collation rules are an approximation of the root collator's sort order.
* They are almost never used or useful at runtime and can be removed from the data.
* See User Guide:
* Collation Customization, Building on Existing Locales
*
*
{@link #getRules()} should normally be used instead.
* @param fullrules
* true if the rules that defines the full set of collation order is required, otherwise false for
* returning only the tailored rules
* @return the current rules that defines this Collator.
* @see #getRules()
* @stable ICU 2.6
*/
public String getRules(boolean fullrules) {
if (!fullrules) {
return tailoring.getRules();
}
return CollationLoader.getRootRules() + tailoring.getRules();
}
/**
* Get a UnicodeSet that contains all the characters and sequences tailored in this collator.
*
* @return a pointer to a UnicodeSet object containing all the code points and sequences that may sort differently
* than in the root collator.
* @stable ICU 2.4
*/
@Override
public UnicodeSet getTailoredSet() {
UnicodeSet tailored = new UnicodeSet();
if(data.base != null) {
new TailoredSet(tailored).forData(data);
}
return tailored;
}
/**
* Gets unicode sets containing contractions and/or expansions of a collator
*
* @param contractions
* if not null, set to contain contractions
* @param expansions
* if not null, set to contain expansions
* @param addPrefixes
* add the prefix contextual elements to contractions
* @throws Exception
* Throws an exception if any errors occurs.
* @stable ICU 3.4
*/
public void getContractionsAndExpansions(UnicodeSet contractions, UnicodeSet expansions, boolean addPrefixes)
throws Exception {
if (contractions != null) {
contractions.clear();
}
if (expansions != null) {
expansions.clear();
}
new ContractionsAndExpansions(contractions, expansions, null, addPrefixes).forData(data);
}
/**
* Adds the contractions that start with character c to the set.
* Ignores prefixes. Used by AlphabeticIndex.
* @internal
* @deprecated This API is ICU internal only.
*/
void internalAddContractions(int c, UnicodeSet set) {
new ContractionsAndExpansions(set, null, null, false).forCodePoint(data, c);
}
/**
*
* Get a Collation key for the argument String source from this RuleBasedCollator.
*
* General recommendation:
* If comparison are to be done to the same String multiple times, it would be more efficient to generate
* CollationKeys for the Strings and use CollationKey.compareTo(CollationKey) for the comparisons. If the each
* Strings are compared to only once, using the method RuleBasedCollator.compare(String, String) will have a better
* performance.
*
* See the class documentation for an explanation about CollationKeys.
*
* @param source
* the text String to be transformed into a collation key.
* @return the CollationKey for the given String based on this RuleBasedCollator's collation rules. If the source
* String is null, a null CollationKey is returned.
* @see CollationKey
* @see #compare(String, String)
* @see #getRawCollationKey
* @stable ICU 2.8
*/
@Override
public CollationKey getCollationKey(String source) {
if (source == null) {
return null;
}
CollationBuffer buffer = null;
try {
buffer = getCollationBuffer();
return getCollationKey(source, buffer);
} finally {
releaseCollationBuffer(buffer);
}
}
private CollationKey getCollationKey(String source, CollationBuffer buffer) {
buffer.rawCollationKey = getRawCollationKey(source, buffer.rawCollationKey, buffer);
return new CollationKey(source, buffer.rawCollationKey);
}
/**
* Gets the simpler form of a CollationKey for the String source following the rules of this Collator and stores the
* result into the user provided argument key. If key has a internal byte array of length that's too small for the
* result, the internal byte array will be grown to the exact required size.
*
* @param source the text String to be transformed into a RawCollationKey
* @param key output RawCollationKey to store results
* @return If key is null, a new instance of RawCollationKey will be created and returned, otherwise the user
* provided key will be returned.
* @see #getCollationKey
* @see #compare(String, String)
* @see RawCollationKey
* @stable ICU 2.8
*/
@Override
public RawCollationKey getRawCollationKey(String source, RawCollationKey key) {
if (source == null) {
return null;
}
CollationBuffer buffer = null;
try {
buffer = getCollationBuffer();
return getRawCollationKey(source, key, buffer);
} finally {
releaseCollationBuffer(buffer);
}
}
private static final class CollationKeyByteSink extends SortKeyByteSink {
CollationKeyByteSink(RawCollationKey key) {
super(key.bytes);
key_ = key;
}
@Override
protected void AppendBeyondCapacity(byte[] bytes, int start, int n, int length) {
// n > 0 && appended_ > capacity_
if (Resize(n, length)) {
System.arraycopy(bytes, start, buffer_, length, n);
}
}
@Override
protected boolean Resize(int appendCapacity, int length) {
int newCapacity = 2 * buffer_.length;
int altCapacity = length + 2 * appendCapacity;
if (newCapacity < altCapacity) {
newCapacity = altCapacity;
}
if (newCapacity < 200) {
newCapacity = 200;
}
// Do not call key_.ensureCapacity(newCapacity) because we do not
// keep key_.size in sync with appended_.
// We only set it when we are done.
byte[] newBytes = new byte[newCapacity];
System.arraycopy(buffer_, 0, newBytes, 0, length);
buffer_ = key_.bytes = newBytes;
return true;
}
private RawCollationKey key_;
}
private RawCollationKey getRawCollationKey(CharSequence source, RawCollationKey key, CollationBuffer buffer) {
if (key == null) {
key = new RawCollationKey(simpleKeyLengthEstimate(source));
} else if (key.bytes == null) {
key.bytes = new byte[simpleKeyLengthEstimate(source)];
}
CollationKeyByteSink sink = new CollationKeyByteSink(key);
writeSortKey(source, sink, buffer);
key.size = sink.NumberOfBytesAppended();
return key;
}
private int simpleKeyLengthEstimate(CharSequence source) {
return 2 * source.length() + 10;
}
private void writeSortKey(CharSequence s, CollationKeyByteSink sink, CollationBuffer buffer) {
boolean numeric = settings.readOnly().isNumeric();
if(settings.readOnly().dontCheckFCD()) {
buffer.leftUTF16CollIter.setText(numeric, s, 0);
CollationKeys.writeSortKeyUpToQuaternary(
buffer.leftUTF16CollIter, data.compressibleBytes, settings.readOnly(),
sink, Collation.PRIMARY_LEVEL,
CollationKeys.SIMPLE_LEVEL_FALLBACK, true);
} else {
buffer.leftFCDUTF16Iter.setText(numeric, s, 0);
CollationKeys.writeSortKeyUpToQuaternary(
buffer.leftFCDUTF16Iter, data.compressibleBytes, settings.readOnly(),
sink, Collation.PRIMARY_LEVEL,
CollationKeys.SIMPLE_LEVEL_FALLBACK, true);
}
if(settings.readOnly().getStrength() == IDENTICAL) {
writeIdenticalLevel(s, sink);
}
sink.Append(Collation.TERMINATOR_BYTE);
}
private void writeIdenticalLevel(CharSequence s, CollationKeyByteSink sink) {
// NFD quick check
int nfdQCYesLimit = data.nfcImpl.decompose(s, 0, s.length(), null);
sink.Append(Collation.LEVEL_SEPARATOR_BYTE);
// Sync the ByteArrayWrapper size with the key length.
sink.key_.size = sink.NumberOfBytesAppended();
int prev = 0;
if(nfdQCYesLimit != 0) {
prev = BOCSU.writeIdenticalLevelRun(prev, s, 0, nfdQCYesLimit, sink.key_);
}
// Is there non-NFD text?
if(nfdQCYesLimit < s.length()) {
int destLengthEstimate = s.length() - nfdQCYesLimit;
StringBuilder nfd = new StringBuilder();
data.nfcImpl.decompose(s, nfdQCYesLimit, s.length(), nfd, destLengthEstimate);
BOCSU.writeIdenticalLevelRun(prev, nfd, 0, nfd.length(), sink.key_);
}
// Sync the key with the buffer again which got bytes appended and may have been reallocated.
sink.setBufferAndAppended(sink.key_.bytes, sink.key_.size);
}
/**
* Returns the CEs for the string.
* @param str the string
* @internal for tests & tools
* @deprecated This API is ICU internal only.
*/
@Deprecated
public long[] internalGetCEs(CharSequence str) {
CollationBuffer buffer = null;
try {
buffer = getCollationBuffer();
boolean numeric = settings.readOnly().isNumeric();
CollationIterator iter;
if(settings.readOnly().dontCheckFCD()) {
buffer.leftUTF16CollIter.setText(numeric, str, 0);
iter = buffer.leftUTF16CollIter;
} else {
buffer.leftFCDUTF16Iter.setText(numeric, str, 0);
iter = buffer.leftFCDUTF16Iter;
}
int length = iter.fetchCEs() - 1;
assert length >= 0 && iter.getCE(length) == Collation.NO_CE;
long[] ces = new long[length];
System.arraycopy(iter.getCEs(), 0, ces, 0, length);
return ces;
} finally {
releaseCollationBuffer(buffer);
}
}
/**
* Returns this Collator's strength attribute. The strength attribute
* determines the minimum level of difference considered significant.
*
*
{@icunote} This can return QUATERNARY strength, which is not supported by the
* JDK version.
*
*
See the Collator class description for more details.
*
* @return this Collator's current strength attribute.
* @see #setStrength
* @see #PRIMARY
* @see #SECONDARY
* @see #TERTIARY
* @see #QUATERNARY
* @see #IDENTICAL
* @stable ICU 2.8
*/
@Override
public int getStrength() {
return settings.readOnly().getStrength();
}
/**
* Returns the decomposition mode of this Collator. The decomposition mode
* determines how Unicode composed characters are handled.
*
*
See the Collator class description for more details.
*
* @return the decomposition mode
* @see #setDecomposition
* @see #NO_DECOMPOSITION
* @see #CANONICAL_DECOMPOSITION
* @stable ICU 2.8
*/
@Override
public int getDecomposition() {
return (settings.readOnly().options & CollationSettings.CHECK_FCD) != 0 ?
CANONICAL_DECOMPOSITION : NO_DECOMPOSITION;
}
/**
* Return true if an uppercase character is sorted before the corresponding lowercase character. See
* setCaseFirst(boolean) for details.
*
* @see #setUpperCaseFirst
* @see #setLowerCaseFirst
* @see #isLowerCaseFirst
* @see #setCaseFirstDefault
* @return true if upper cased characters are sorted before lower cased characters, false otherwise
* @stable ICU 2.8
*/
public boolean isUpperCaseFirst() {
return (settings.readOnly().getCaseFirst() == CollationSettings.CASE_FIRST_AND_UPPER_MASK);
}
/**
* Return true if a lowercase character is sorted before the corresponding uppercase character. See
* setCaseFirst(boolean) for details.
*
* @see #setUpperCaseFirst
* @see #setLowerCaseFirst
* @see #isUpperCaseFirst
* @see #setCaseFirstDefault
* @return true lower cased characters are sorted before upper cased characters, false otherwise
* @stable ICU 2.8
*/
public boolean isLowerCaseFirst() {
return (settings.readOnly().getCaseFirst() == CollationSettings.CASE_FIRST);
}
/**
* Checks if the alternate handling behavior is the UCA defined SHIFTED or NON_IGNORABLE. If return value is true,
* then the alternate handling attribute for the Collator is SHIFTED. Otherwise if return value is false, then the
* alternate handling attribute for the Collator is NON_IGNORABLE See setAlternateHandlingShifted(boolean) for more
* details.
*
* @return true or false
* @see #setAlternateHandlingShifted(boolean)
* @see #setAlternateHandlingDefault
* @stable ICU 2.8
*/
public boolean isAlternateHandlingShifted() {
return settings.readOnly().getAlternateHandling();
}
/**
* Checks if case level is set to true. See setCaseLevel(boolean) for details.
*
* @return the case level mode
* @see #setCaseLevelDefault
* @see #isCaseLevel
* @see #setCaseLevel(boolean)
* @stable ICU 2.8
*/
public boolean isCaseLevel() {
return (settings.readOnly().options & CollationSettings.CASE_LEVEL) != 0;
}
/**
* Checks if French Collation is set to true. See setFrenchCollation(boolean) for details.
*
* @return true if French Collation is set to true, false otherwise
* @see #setFrenchCollation(boolean)
* @see #setFrenchCollationDefault
* @stable ICU 2.8
*/
public boolean isFrenchCollation() {
return (settings.readOnly().options & CollationSettings.BACKWARD_SECONDARY) != 0;
}
/**
* Checks if the Hiragana Quaternary mode is set on. See setHiraganaQuaternary(boolean) for more details.
*
*
This attribute was an implementation detail of the CLDR Japanese tailoring.
* Since ICU 50, this attribute is not settable any more via API functions.
* Since CLDR 25/ICU 53, explicit quaternary relations are used
* to achieve the same Japanese sort order.
*
* @return false
* @see #setHiraganaQuaternaryDefault
* @see #setHiraganaQuaternary(boolean)
* @deprecated ICU 50 Implementation detail, cannot be set via API, was removed from implementation.
*/
@Deprecated
public boolean isHiraganaQuaternary() {
return false;
}
/**
* {@icu} Gets the variable top value of a Collator.
*
* @return the variable top primary weight
* @see #getMaxVariable
* @stable ICU 2.6
*/
@Override
public int getVariableTop() {
return (int)settings.readOnly().variableTop;
}
/**
* Method to retrieve the numeric collation value. When numeric collation is turned on, this Collator generates a
* collation key for the numeric value of substrings of digits. This is a way to get '100' to sort AFTER '2'
*
* @see #setNumericCollation
* @see #setNumericCollationDefault
* @return true if numeric collation is turned on, false otherwise
* @stable ICU 2.8
*/
public boolean getNumericCollation() {
return (settings.readOnly().options & CollationSettings.NUMERIC) != 0;
}
/**
* Retrieves the reordering codes for this collator.
* These reordering codes are a combination of UScript codes and ReorderCodes.
* @return a copy of the reordering codes for this collator;
* if none are set then returns an empty array
* @see #setReorderCodes
* @see Collator#getEquivalentReorderCodes
* @stable ICU 4.8
*/
@Override
public int[] getReorderCodes() {
return settings.readOnly().reorderCodes.clone();
}
// public other methods -------------------------------------------------
/**
* {@inheritDoc}
* @stable ICU 2.8
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!super.equals(obj)) {
return false;
}
RuleBasedCollator o = (RuleBasedCollator) obj;
if(!settings.readOnly().equals(o.settings.readOnly())) { return false; }
if(data == o.data) { return true; }
boolean thisIsRoot = data.base == null;
boolean otherIsRoot = o.data.base == null;
assert(!thisIsRoot || !otherIsRoot); // otherwise their data pointers should be ==
if(thisIsRoot != otherIsRoot) { return false; }
String theseRules = tailoring.getRules();
String otherRules = o.tailoring.getRules();
if((thisIsRoot || theseRules.length() != 0) &&
(otherIsRoot || otherRules.length() != 0)) {
// Shortcut: If both collators have valid rule strings, then compare those.
if(theseRules.equals(otherRules)) { return true; }
}
// Different rule strings can result in the same or equivalent tailoring.
// The rule strings are optional in ICU resource bundles, although included by default.
// cloneBinary() drops the rule string.
UnicodeSet thisTailored = getTailoredSet();
UnicodeSet otherTailored = o.getTailoredSet();
if(!thisTailored.equals(otherTailored)) { return false; }
// For completeness, we should compare all of the mappings;
// or we should create a list of strings, sort it with one collator,
// and check if both collators compare adjacent strings the same
// (order & strength, down to quaternary); or similar.
// Testing equality of collators seems unusual.
return true;
}
/**
* Generates a unique hash code for this RuleBasedCollator.
*
* @return the unique hash code for this Collator
* @stable ICU 2.8
*/
@Override
public int hashCode() {
int h = settings.readOnly().hashCode();
if(data.base == null) { return h; } // root collator
// Do not rely on the rule string, see comments in operator==().
UnicodeSet set = getTailoredSet();
UnicodeSetIterator iter = new UnicodeSetIterator(set);
while(iter.next() && iter.codepoint != UnicodeSetIterator.IS_STRING) {
h ^= data.getCE32(iter.codepoint);
}
return h;
}
/**
* Compares the source text String to the target text String according to the collation rules, strength and
* decomposition mode for this RuleBasedCollator. Returns an integer less than, equal to or greater than zero
* depending on whether the source String is less than, equal to or greater than the target String. See the Collator
* class description for an example of use.
*
* General recommendation:
* If comparison are to be done to the same String multiple times, it would be more efficient to generate
* CollationKeys for the Strings and use CollationKey.compareTo(CollationKey) for the comparisons. If speed
* performance is critical and object instantiation is to be reduced, further optimization may be achieved by
* generating a simpler key of the form RawCollationKey and reusing this RawCollationKey object with the method
* RuleBasedCollator.getRawCollationKey. Internal byte representation can be directly accessed via RawCollationKey
* and stored for future use. Like CollationKey, RawCollationKey provides a method RawCollationKey.compareTo for key
* comparisons. If the each Strings are compared to only once, using the method RuleBasedCollator.compare(String,
* String) will have a better performance.
*
* @param source
* the source text String.
* @param target
* the target text String.
* @return Returns an integer value. Value is less than zero if source is less than target, value is zero if source
* and target are equal, value is greater than zero if source is greater than target.
* @see CollationKey
* @see #getCollationKey
* @stable ICU 2.8
*/
@Override
public int compare(String source, String target) {
return doCompare(source, target);
}
/**
* Abstract iterator for identical-level string comparisons.
* Returns FCD code points and handles temporary switching to NFD.
*
*
As with CollationIterator,
* Java NFDIterator instances are partially constructed and cached,
* and completed when reset for use.
* C++ NFDIterator instances are stack-allocated.
*/
private static abstract class NFDIterator {
/**
* Partial constructor, must call reset().
*/
NFDIterator() {}
final void reset() {
index = -1;
}
/**
* Returns the next code point from the internal normalization buffer,
* or else the next text code point.
* Returns -1 at the end of the text.
*/
final int nextCodePoint() {
if(index >= 0) {
if(index == decomp.length()) {
index = -1;
} else {
int c = Character.codePointAt(decomp, index);
index += Character.charCount(c);
return c;
}
}
return nextRawCodePoint();
}
/**
* @param nfcImpl
* @param c the last code point returned by nextCodePoint() or nextDecomposedCodePoint()
* @return the first code point in c's decomposition,
* or c itself if it was decomposed already or if it does not decompose
*/
final int nextDecomposedCodePoint(Normalizer2Impl nfcImpl, int c) {
if(index >= 0) { return c; }
decomp = nfcImpl.getDecomposition(c);
if(decomp == null) { return c; }
c = Character.codePointAt(decomp, 0);
index = Character.charCount(c);
return c;
}
/**
* Returns the next text code point in FCD order.
* Returns -1 at the end of the text.
*/
protected abstract int nextRawCodePoint();
private String decomp;
private int index;
}
private static class UTF16NFDIterator extends NFDIterator {
UTF16NFDIterator() {}
void setText(CharSequence seq, int start) {
reset();
s = seq;
pos = start;
}
@Override
protected int nextRawCodePoint() {
if(pos == s.length()) { return Collation.SENTINEL_CP; }
int c = Character.codePointAt(s, pos);
pos += Character.charCount(c);
return c;
}
protected CharSequence s;
protected int pos;
}
private static final class FCDUTF16NFDIterator extends UTF16NFDIterator {
FCDUTF16NFDIterator() {}
void setText(Normalizer2Impl nfcImpl, CharSequence seq, int start) {
reset();
int spanLimit = nfcImpl.makeFCD(seq, start, seq.length(), null);
if(spanLimit == seq.length()) {
s = seq;
pos = start;
} else {
if(str == null) {
str = new StringBuilder();
} else {
str.setLength(0);
}
str.append(seq, start, spanLimit);
ReorderingBuffer buffer = new ReorderingBuffer(nfcImpl, str, seq.length() - start);
nfcImpl.makeFCD(seq, spanLimit, seq.length(), buffer);
s = str;
pos = 0;
}
}
private StringBuilder str;
}
private static final int compareNFDIter(Normalizer2Impl nfcImpl, NFDIterator left, NFDIterator right) {
for(;;) {
// Fetch the next FCD code point from each string.
int leftCp = left.nextCodePoint();
int rightCp = right.nextCodePoint();
if(leftCp == rightCp) {
if(leftCp < 0) { break; }
continue;
}
// If they are different, then decompose each and compare again.
if(leftCp < 0) {
leftCp = -2; // end of string
} else if(leftCp == 0xfffe) {
leftCp = -1; // U+FFFE: merge separator
} else {
leftCp = left.nextDecomposedCodePoint(nfcImpl, leftCp);
}
if(rightCp < 0) {
rightCp = -2; // end of string
} else if(rightCp == 0xfffe) {
rightCp = -1; // U+FFFE: merge separator
} else {
rightCp = right.nextDecomposedCodePoint(nfcImpl, rightCp);
}
if(leftCp < rightCp) { return Collation.LESS; }
if(leftCp > rightCp) { return Collation.GREATER; }
}
return Collation.EQUAL;
}
/**
* Compares two CharSequences.
* @internal
* @deprecated This API is ICU internal only.
*/
@Override
@Deprecated
protected int doCompare(CharSequence left, CharSequence right) {
if(left == right) {
return Collation.EQUAL;
}
// Identical-prefix test.
int equalPrefixLength = 0;
for(;;) {
if(equalPrefixLength == left.length()) {
if(equalPrefixLength == right.length()) { return Collation.EQUAL; }
break;
} else if(equalPrefixLength == right.length() ||
left.charAt(equalPrefixLength) != right.charAt(equalPrefixLength)) {
break;
}
++equalPrefixLength;
}
CollationSettings roSettings = settings.readOnly();
boolean numeric = roSettings.isNumeric();
if(equalPrefixLength > 0) {
if((equalPrefixLength != left.length() &&
data.isUnsafeBackward(left.charAt(equalPrefixLength), numeric)) ||
(equalPrefixLength != right.length() &&
data.isUnsafeBackward(right.charAt(equalPrefixLength), numeric))) {
// Identical prefix: Back up to the start of a contraction or reordering sequence.
while(--equalPrefixLength > 0 &&
data.isUnsafeBackward(left.charAt(equalPrefixLength), numeric)) {}
}
// Notes:
// - A longer string can compare equal to a prefix of it if only ignorables follow.
// - With a backward level, a longer string can compare less-than a prefix of it.
// Pass the actual start of each string into the CollationIterators,
// plus the equalPrefixLength position,
// so that prefix matches back into the equal prefix work.
}
int result;
int fastLatinOptions = roSettings.fastLatinOptions;
if(fastLatinOptions >= 0 &&
(equalPrefixLength == left.length() ||
left.charAt(equalPrefixLength) <= CollationFastLatin.LATIN_MAX) &&
(equalPrefixLength == right.length() ||
right.charAt(equalPrefixLength) <= CollationFastLatin.LATIN_MAX)) {
result = CollationFastLatin.compareUTF16(data.fastLatinTable,
roSettings.fastLatinPrimaries,
fastLatinOptions,
left, right, equalPrefixLength);
} else {
result = CollationFastLatin.BAIL_OUT_RESULT;
}
if(result == CollationFastLatin.BAIL_OUT_RESULT) {
CollationBuffer buffer = null;
try {
buffer = getCollationBuffer();
if(roSettings.dontCheckFCD()) {
buffer.leftUTF16CollIter.setText(numeric, left, equalPrefixLength);
buffer.rightUTF16CollIter.setText(numeric, right, equalPrefixLength);
result = CollationCompare.compareUpToQuaternary(
buffer.leftUTF16CollIter, buffer.rightUTF16CollIter, roSettings);
} else {
buffer.leftFCDUTF16Iter.setText(numeric, left, equalPrefixLength);
buffer.rightFCDUTF16Iter.setText(numeric, right, equalPrefixLength);
result = CollationCompare.compareUpToQuaternary(
buffer.leftFCDUTF16Iter, buffer.rightFCDUTF16Iter, roSettings);
}
} finally {
releaseCollationBuffer(buffer);
}
}
if(result != Collation.EQUAL || roSettings.getStrength() < Collator.IDENTICAL) {
return result;
}
CollationBuffer buffer = null;
try {
buffer = getCollationBuffer();
// Compare identical level.
Normalizer2Impl nfcImpl = data.nfcImpl;
if(roSettings.dontCheckFCD()) {
buffer.leftUTF16NFDIter.setText(left, equalPrefixLength);
buffer.rightUTF16NFDIter.setText(right, equalPrefixLength);
return compareNFDIter(nfcImpl, buffer.leftUTF16NFDIter, buffer.rightUTF16NFDIter);
} else {
buffer.leftFCDUTF16NFDIter.setText(nfcImpl, left, equalPrefixLength);
buffer.rightFCDUTF16NFDIter.setText(nfcImpl, right, equalPrefixLength);
return compareNFDIter(nfcImpl, buffer.leftFCDUTF16NFDIter, buffer.rightFCDUTF16NFDIter);
}
} finally {
releaseCollationBuffer(buffer);
}
}
// package private constructors ------------------------------------------
RuleBasedCollator(CollationTailoring t, ULocale vl) {
data = t.data;
settings = t.settings.clone();
tailoring = t;
validLocale = vl;
actualLocaleIsSameAsValid = false;
}
private void adoptTailoring(CollationTailoring t) {
assert(settings == null && data == null && tailoring == null);
data = t.data;
settings = t.settings.clone();
tailoring = t;
validLocale = t.actualLocale;
actualLocaleIsSameAsValid = false;
}
// package private methods -----------------------------------------------
/**
* Tests whether a character is "unsafe" for use as a collation starting point.
*
* @param c code point or code unit
* @return true if c is unsafe
* @see CollationElementIterator#setOffset(int)
*/
final boolean isUnsafe(int c) {
return data.isUnsafeBackward(c, settings.readOnly().isNumeric());
}
/**
* Frozen state of the collator.
*/
private Lock frozenLock;
private static final class CollationBuffer {
private CollationBuffer(CollationData data) {
leftUTF16CollIter = new UTF16CollationIterator(data);
rightUTF16CollIter = new UTF16CollationIterator(data);
leftFCDUTF16Iter = new FCDUTF16CollationIterator(data);
rightFCDUTF16Iter = new FCDUTF16CollationIterator(data);
leftUTF16NFDIter = new UTF16NFDIterator();
rightUTF16NFDIter = new UTF16NFDIterator();
leftFCDUTF16NFDIter = new FCDUTF16NFDIterator();
rightFCDUTF16NFDIter = new FCDUTF16NFDIterator();
}
UTF16CollationIterator leftUTF16CollIter;
UTF16CollationIterator rightUTF16CollIter;
FCDUTF16CollationIterator leftFCDUTF16Iter;
FCDUTF16CollationIterator rightFCDUTF16Iter;
UTF16NFDIterator leftUTF16NFDIter;
UTF16NFDIterator rightUTF16NFDIter;
FCDUTF16NFDIterator leftFCDUTF16NFDIter;
FCDUTF16NFDIterator rightFCDUTF16NFDIter;
RawCollationKey rawCollationKey;
}
/**
* Get the version of this collator object.
*
* @return the version object associated with this collator
* @stable ICU 2.8
*/
@Override
public VersionInfo getVersion() {
int version = tailoring.version;
int rtVersion = VersionInfo.UCOL_RUNTIME_VERSION.getMajor();
return VersionInfo.getInstance(
(version >>> 24) + (rtVersion << 4) + (rtVersion >> 4),
((version >> 16) & 0xff), ((version >> 8) & 0xff), (version & 0xff));
}
/**
* Get the UCA version of this collator object.
*
* @return the version object associated with this collator
* @stable ICU 2.8
*/
@Override
public VersionInfo getUCAVersion() {
VersionInfo v = getVersion();
// Note: This is tied to how the current implementation encodes the UCA version
// in the overall getVersion().
// Alternatively, we could load the root collator and get at lower-level data from there.
// Either way, it will reflect the input collator's UCA version only
// if it is a known implementation.
// (C++ comment) It would be cleaner to make this a virtual Collator method.
// (In Java, it is virtual.)
return VersionInfo.getInstance(v.getMinor() >> 3, v.getMinor() & 7, v.getMilli() >> 6, 0);
}
private CollationBuffer collationBuffer;
private final CollationBuffer getCollationBuffer() {
if (isFrozen()) {
frozenLock.lock();
} else if (collationBuffer == null) {
collationBuffer = new CollationBuffer(data);
}
return collationBuffer;
}
private final void releaseCollationBuffer(CollationBuffer buffer) {
if (isFrozen()) {
frozenLock.unlock();
}
}
/**
* {@inheritDoc}
* @draft ICU 53 (retain)
* @provisional This API might change or be removed in a future release.
*/
@Override
public ULocale getLocale(ULocale.Type type) {
if (type == ULocale.ACTUAL_LOCALE) {
return actualLocaleIsSameAsValid ? validLocale : tailoring.actualLocale;
} else if(type == ULocale.VALID_LOCALE) {
return validLocale;
} else {
throw new IllegalArgumentException("unknown ULocale.Type " + type);
}
}
/**
* {@inheritDoc}
*/
@Override
void setLocale(ULocale valid, ULocale actual) {
// This method is called
// by other protected functions that checks and makes sure that
// valid and actual are not null before passing
assert (valid == null) == (actual == null);
// Another check we could do is that the actual locale is at
// the same level or less specific than the valid locale.
// TODO: Starting with Java 7, use Objects.equals(a, b).
if(Utility.objectEquals(actual, tailoring.actualLocale)) {
actualLocaleIsSameAsValid = false;
} else {
assert(Utility.objectEquals(actual, valid));
actualLocaleIsSameAsValid = true;
}
// Do not modify tailoring.actualLocale:
// We cannot be sure that that would be thread-safe.
validLocale = valid;
}
CollationData data;
SharedObject.Reference settings; // reference-counted
CollationTailoring tailoring; // C++: reference-counted
private ULocale validLocale;
// Note: No need in Java to track which attributes have been set explicitly.
// int or EnumSet explicitlySetAttributes;
private boolean actualLocaleIsSameAsValid;
}