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Java Source | 1997-05-20 | 37.7 KB | 988 lines |
- /*
- * @(#)RuleBasedCollator.java 1.9 97/03/03
- *
- * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
- * (C) Copyright IBM Corp. 1996, 1997 - All Rights Reserved
- *
- * Portions copyright (c) 1996 Sun Microsystems, Inc. All Rights Reserved.
- *
- * The original version of this source code and documentation is copyrighted
- * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
- * materials are provided under terms of a License Agreement between Taligent
- * and Sun. This technology is protected by multiple US and International
- * patents. This notice and attribution to Taligent may not be removed.
- * Taligent is a registered trademark of Taligent, Inc.
- *
- * Permission to use, copy, modify, and distribute this software
- * and its documentation for NON-COMMERCIAL purposes and without
- * fee is hereby granted provided that this copyright notice
- * appears in all copies. Please refer to the file "copyright.html"
- * for further important copyright and licensing information.
- *
- * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
- * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
- * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
- * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
- * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
- * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
- *
- */
-
- package java.text;
-
- import java.lang.Character;
- import java.util.Vector;
- import java.util.Date;
-
- /**
- * The <code>RuleBasedCollator</code> class is a concrete subclass of
- * <code>Collator</code> that provides a simple, data-driven, table collator.
- * With this class you can create a customized table-based <code>Collator</code>.
- * <code>RuleBasedCollator</code> maps characters to sort keys.
- *
- * <p>
- * <code>RuleBasedCollator</code> has the following restrictions
- * for efficiency (other subclasses may be used for more complex languages) :
- * <ol>
- * <li>The French secondary ordering is applied to the whole collator
- * object.
- * <li>All non-mentioned Unicode characters are at the end of the
- * collation order.
- * <li>Private use characters are treated as identical. The private
- * use area in Unicode is <code>0xE800</code>-<code>0xF8FF</code>.
- * </ol>
- *
- * <p>
- * The collation table is composed of a list of collation rules, where each
- * rule is of three forms:
- * <pre>
- * < modifier >
- * < relation > < text-argument >
- * < reset > < text-argument >
- * </pre>
- * The following demonstrates how to create your own collation rules:
- * <UL Type=round>
- * <LI><strong>Text-Argument</strong>: A text-argument is any sequence of
- * characters, excluding special characters (that is, whitespace
- * characters and the characters used in modifier, relation and reset).
- * If those characters are desired, you can put them in single quotes
- * (e.g. ampersand => '&').
- * <LI><strong>Modifier</strong>: There is a single modifier
- * which is used to specify that all accents (secondary differences) are
- * backwards.
- * <p>'@' : Indicates that accents are sorted backwards, as in French.
- * <LI><strong>Relation</strong>: The relations are the following:
- * <UL Type=square>
- * <LI>'<' : Greater, as a letter difference (primary)
- * <LI>';' : Greater, as an accent difference (secondary)
- * <LI>',' : Greater, as a case difference (tertiary)
- * <LI>'=' : Equal
- * </UL>
- * <LI><strong>Reset</strong>: There is a single reset
- * which is used primarily for contractions and expansions, but which
- * can also be used to add a modification at the end of a set of rules.
- * <p>'&' : Indicates that the next rule follows the position to where
- * the reset text-argument would be sorted.
- * </UL>
- *
- * <p>
- * This sounds more complicated than it is in practice. For example, the
- * following are equivalent ways of expressing the same thing:
- * <blockquote>
- * <pre>
- * a < b < c
- * a < b & b < c
- * a < c & a < b
- * </pre>
- * </blockquote>
- * Notice that the order is important, as the subsequent item goes immediately
- * after the text-argument. The following are not equivalent:
- * <blockquote>
- * <pre>
- * a < b & a < c
- * a < c & a < b
- * </pre>
- * </blockquote>
- * Either the text-argument must already be present in the sequence, or some
- * initial substring of the text-argument must be present. (e.g. "a < b & ae <
- * e" is valid since "a" is present in the sequence before "ae" is reset). In
- * this latter case, "ae" is not entered and treated as a single character;
- * instead, "e" is sorted as if it were expanded to two characters: "a"
- * followed by an "e". This difference appears in natural languages: in
- * traditional Spanish "ch" is treated as though it contracts to a single
- * character (expressed as "c < ch < d"), while in traditional German "Σ"
- * (a-umlaut) is treated as though it expands to two characters (expressed as
- * "a & ae ; Σ < b").
- *
- * <p>
- * <strong>Ignorable Characters</strong>
- * <p>
- * For ignorable characters, the first rule must start with a relation (the
- * examples we have used above are really fragments; "a < b" really should be
- * "< a < b"). If, however, the first relation is not "<", then all the all
- * text-arguments up to the first "<" are ignorable. For example, ", - < a < b"
- * makes "-" an ignorable character, as we saw earlier in the word
- * "black-birds". In the samples for different languages, you see that most
- * accents are ignorable.
- *
- * <p><strong>Normalization and Accents</strong>
- * <p>
- * The <code>Collator</code> object automatically normalizes text internally
- * to separate accents from base characters where possible. This is done both when
- * processing the rules, and when comparing two strings. <code>Collator</code>
- * also uses the Unicode canonical mapping to ensure that combining sequences
- * are sorted properly (for more information, see
- * <A HREF="http://www.aw.com/devpress">The Unicode Standard, Version 2.0</A>.)</P>
- *
- * <p><strong>Errors</strong>
- * <p>
- * The following are errors:
- * <UL Type=round>
- * <LI>A text-argument not preceded by either a reset or relation character
- * (e.g. "a < b c < d").
- * <LI>A relation or reset character not followed by a text-argument
- * (e.g. "a < , b").
- * <LI>A reset where the text-argument (or an initial substring of the
- * text-argument) is not already in the sequence.
- * (e.g. "a < b & e < f")
- * </UL>
- * If you produce one of these errors, a <code>RuleBasedCollator</code> throws
- * a <code>ParseException</code>.
- *
- * <p><strong>Examples</strong>
- * <p>Simple: "< a < b < c < d"
- * <p>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"
- *
- * <p>
- * Normally, to create a rule-based Collator object, you will use
- * <code>Collator</code>'s factory method <code>getInstance</code>.
- * However, to create a rule-based Collator object with specialized
- * rules tailored to your needs, you construct the <code>RuleBasedCollator</code>
- * with the rules contained in a <code>String</code> object. For example:
- * <blockquote>
- * <pre>
- * String Simple = "< a < b < c < d";
- * RuleBasedCollator mySimple = new RuleBasedCollator(Simple);
- * </pre>
- * </blockquote>
- * Or:
- * <blockquote>
- * <pre>
- * 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 myNorwegian = new RuleBasedCollator(Norwegian);
- * </pre>
- * </blockquote>
- *
- * <p>
- * Combining <code>Collator</code>s is as simple as concatenating strings.
- * Here's an example that combines two <code>Collator</code>s from two
- * different locales:
- * <blockquote>
- * <pre>
- * // 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
- * </pre>
- * </blockquote>
- *
- * <p>
- * Another more interesting example would be to make changes on an existing
- * table to create a new <code>Collator</code> object. For example, add
- * "& C < ch, cH, Ch, CH" to the <code>en_USCollator</code> object to create
- * your own:
- * <blockquote>
- * <pre>
- * // Create a new Collator object with additional rules
- * String addRules = "& C < ch, cH, Ch, CH";
- * RuleBasedCollator myCollator =
- * new RuleBasedCollator(en_USCollator + addRules);
- * // myCollator contains the new rules
- * </pre>
- * </blockquote>
- *
- * <p>
- * The following example demonstrates how to change the order of
- * non-spacing accents,
- * <blockquote>
- * <pre>
- * // old rule
- * String oldRules = "=\u0301;\u0300;\u0302;\u0308" // main accents
- * + ";\u0327;\u0303;\u0304;\u0305" // main accents
- * + ";\u0306;\u0307;\u0309;\u030A" // main accents
- * + ";\u030B;\u030C;\u030D;\u030E" // main accents
- * + ";\u030F;\u0310;\u0311;\u0312" // main accents
- * + "< 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);
- * </pre>
- * </blockquote>
- *
- * <p>
- * The last example shows how to put new primary ordering in before the
- * default setting. For example, in Japanese <code>Collator</code>, you
- * can either sort English characters before or after Japanese characters,
- * <blockquote>
- * <pre>
- * // get en_US Collator rules
- * RuleBasedCollator en_USCollator = (RuleBasedCollator)Collator.getInstance(Locale.US);
- * // add a few Japanese character 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);
- * </pre>
- * </blockquote>
- *
- * @see Collator
- * @see CollationElementIterator
- * @version 1.9 03/03/97
- * @author Helena Shih
- */
- public class RuleBasedCollator extends Collator{
-
- /**
- * RuleBasedCollator constructor. This takes the table rules and builds
- * a collation table out of them. Please see RuleBasedCollator class
- * description for more details on the collation rule syntax.
- * @see java.util.Locale
- * @param rules the collation rules to build the collation table from.
- * @exception ParseException A format exception
- * will be thrown if the build process of the rules fails. For
- * example, build rule "a < b c < d" will cause the constructor to
- * throw the ParseException.
- */
- public RuleBasedCollator(String rules) throws ParseException {
- setStrength(Collator.TERTIARY);
- build(rules);
- }
-
- /**
- * Gets the table-based rules for the collation object.
- * @return returns the collation rules that the table collation object
- * was created from.
- */
- public String getRules()
- {
- if (ruleTable == null) {
- ruleTable = mPattern.getPattern();
- mPattern = null;
- }
- return ruleTable;
- }
-
-
- /**
- * Return a CollationElementIterator for the given String.
- * @see java.text.CollationElementIterator
- */
- public CollationElementIterator getCollationElementIterator(String source) {
- return new CollationElementIterator( source, this );
- }
-
- /**
- * Compares the character data stored in two different strings based on the
- * collation rules. Returns information about whether a string is less
- * than, greater than or equal to another string in a language.
- * This can be overriden in a subclass.
- */
- public int compare(String source, String target)
- {
- int result = Collator.EQUAL;
- CollationElementIterator targetCursor
- = new CollationElementIterator(target, this);
- CollationElementIterator sourceCursor
- = new CollationElementIterator(source, this);
- int sOrder = 0;
- int tOrder = 0;
- boolean gets = true, gett = true;
- boolean checks = true, checkt = true;
- while(true) {
- if (gets) sOrder = sourceCursor.next(); else gets = true;
- if (gett) tOrder = targetCursor.next(); else gett = true;
- if ((sOrder == CollationElementIterator.NULLORDER)||
- (tOrder == CollationElementIterator.NULLORDER))
- break;
- if (checks) sOrder = strengthOrder(sOrder);
- if (checkt) tOrder = strengthOrder(tOrder);
- checks = true;
- checkt = true;
- if (sOrder == CollationElementIterator.UNMAPPEDCHARVALUE)
- checks = false;
- if (tOrder == CollationElementIterator.UNMAPPEDCHARVALUE)
- checkt = false;
- if (sOrder == tOrder)
- continue;
- if (CollationElementIterator.primaryOrder(sOrder) !=
- CollationElementIterator.primaryOrder(tOrder))
- {
- if (sOrder == 0) {
- gett = false;
- continue;
- }
- if (tOrder == 0) {
- gets = false;
- continue;
- }
- if (sOrder < MAXIGNORABLE) // sk is ignorable
- {
- if (tOrder < MAXIGNORABLE) // tk is ignorable
- {
- result = checkSecTerDiff(sOrder, tOrder, result);
- continue; // both advances
- }
- else
- {
- if (isFrenchSec ||
- ((result == Collator.EQUAL) ||
- (strengthResult != Collator.SECONDARY)))
- {
- strengthResult = Collator.SECONDARY;
- result = Collator.GREATER;
- }
- gett = false;
- continue;
- }
- }
- else if (tOrder < MAXIGNORABLE)
- {
- // record differences
- if (isFrenchSec ||
- ((result == Collator.EQUAL) ||
- (strengthResult != Collator.SECONDARY)))
- {
- result = Collator.LESS;
- strengthResult = Collator.SECONDARY;
- }
- gets = false;
- continue;
- }
- if (CollationElementIterator.primaryOrder(sOrder) <
- CollationElementIterator.primaryOrder(tOrder))
- result = Collator.LESS;
- else
- result = Collator.GREATER;
- break;
- }
- else
- result = checkSecTerDiff(sOrder, tOrder, result);
- } // while()
- if (sOrder != CollationElementIterator.NULLORDER) {
- if (tOrder == CollationElementIterator.NULLORDER) {
- // later check if ignorable, secondary or tertiary difference
- if (isIgnorable(sOrder) && !isFrenchSec)
- return result;
- if (strengthOrder(sOrder) != 0)
- result = Collator.GREATER;
- }
- }
- if (tOrder != CollationElementIterator.NULLORDER) {
- if (sOrder == CollationElementIterator.NULLORDER) {
- if (isIgnorable(tOrder) && !isFrenchSec)
- return result;
- if (strengthOrder(tOrder) != 0)
- result = Collator.LESS;
- }
- }
- return result;
- }
- /**
- * Transforms the string into a series of characters that can be compared
- * with CollationKey.compareTo. This overrides java.text.Collator.getCollationKey.
- * It can be overriden in a subclass.
- */
- public CollationKey getCollationKey(String source)
- {
- if (source == null)
- return null;
- primResult.setLength(0);
- secResult.setLength(0);
- terResult.setLength(0);
- int order = 0;
- boolean compareSec = (getStrength() >= Collator.SECONDARY);
- boolean compareTer = (getStrength() >= Collator.TERTIARY);
- int secOrder = CollationElementIterator.NULLORDER;
- int terOrder = CollationElementIterator.NULLORDER;
- CollationElementIterator sourceCursor = new
- CollationElementIterator(source, this);
- while ((order = sourceCursor.next()) !=
- CollationElementIterator.NULLORDER)
- {
- secOrder = CollationElementIterator.secondaryOrder(order);
- terOrder = CollationElementIterator.tertiaryOrder(order);
- if (!isIgnorable(order))
- {
- primResult.append((char)
- (CollationElementIterator.primaryOrder(order)
- + COLLATIONKEYOFFSET));
- if (compareSec)
- secResult.append((char)(secOrder+ COLLATIONKEYOFFSET));
- if (compareTer)
- terResult.append((char)(terOrder+ COLLATIONKEYOFFSET));
- }
- else
- {
- if (compareSec)
- secResult.append((char)
- (secOrder+maxSecOrder+ COLLATIONKEYOFFSET));
- if (compareTer)
- terResult.append((char)
- (terOrder+maxTerOrder+ COLLATIONKEYOFFSET));
- }
- }
- if (isFrenchSec)
- {
- // reverse the secondary and tertiary portion
- reverse(secResult);
- reverse(terResult);
- }
- primResult.append((char)0);
- secResult.append((char)0);
- secResult.append(terResult.toString());
- primResult.append(secResult.toString());
- return new CollationKey(source, primResult.toString());
- }
- /**
- * Standard override; no change in semantics.
- */
- public Object clone() {
- RuleBasedCollator other = (RuleBasedCollator) super.clone();
- other.primResult = new StringBuffer(MAXTOKENLEN);
- other.secResult = new StringBuffer(MAXTOKENLEN);
- other.terResult = new StringBuffer(MAXTOKENLEN);
- other.key = new StringBuffer(MAXKEYSIZE);
- return other;
- }
-
- /**
- * Compares the equality of two collation objects.
- * @param obj the table-based collation object to be compared with this.
- * @return true if the current table-based collation object is the same
- * as the table-based collation object obj; false otherwise.
- */
- public boolean equals(Object obj) {
- if (!super.equals(obj)) return false; // super does class check
- RuleBasedCollator other = (RuleBasedCollator) obj;
- // all other non-transient information is also contained in rules.
- return (getRules().equals(other.getRules()));
- }
- /**
- * Generates the hash code for the table-based collation object
- */
- public int hashCode() {
- return getRules().hashCode();
- }
-
- // ==============================================================
- // private
- // ==============================================================
-
- /**
- * Create a table-based collation object with the given rules.
- * @see java.util.RuleBasedCollator#RuleBasedCollator
- * @exception ParseException If the rules format is incorrect.
- */
- private void build(String pattern) throws ParseException
- {
- mapping = new CompactIntArray((int)UNMAPPED);
- int aStrength = Collator.IDENTICAL;
- boolean isSource = true;
- int i = 0;
- String expChars;
- String groupChars;
- if (pattern.length() == 0)
- throw new ParseException("Build rules empty.", 0);
- /* Normalize the build rules. Find occurances of all
- * decomposed characters and normalize the rules before
- * feeding into the builder.
- */
- pattern = DecompositionIterator.decompose(pattern, getDecomposition());
- mPattern = new MergeCollation(pattern);
- for (i = 0; i < mPattern.getCount(); ++i)
- {
- PatternEntry entry = mPattern.getItemAt(i);
- if (entry != null) {
- groupChars = entry.getChars();
- if ((groupChars.length() > 1) &&
- (groupChars.charAt(groupChars.length()-1) == '@')) {
- isFrenchSec = true;
- groupChars = groupChars.substring(0, groupChars.length()-1);
- }
- expChars = entry.getExtension();
- if (expChars.length() != 0) {
- addExpandOrder(groupChars, expChars, entry.getStrength());
- } else if (groupChars.length() > 1) {
- addContractOrder(groupChars, entry.getStrength());
- lastChar = groupChars.charAt(0);
- } else {
- char ch = groupChars.charAt(0);
- addOrder(ch, entry.getStrength());
- lastChar = ch;
- }
- }
- }
- commit();
- mapping.compact();
- }
- /**
- * Look up for unmapped values in the expanded character table.
- */
- private final void commit()
- {
- if (expandTable != null)
- {
- for (int i = 0; i < expandTable.size(); i++)
- {
- int[] valueList = (int [])expandTable.elementAt(i);
- for (int j = 0; j < valueList.length; j++)
- {
- if ((valueList[j] < EXPANDCHARINDEX) &&
- (valueList[j] > CHARINDEX))
- {
- char ch = (char)(valueList[j] - CHARINDEX);
- int realValue = mapping.elementAt(ch);
- if (realValue == UNMAPPED) // ignorable?
- {
- valueList[j] = IGNORABLEMASK & valueList[j-1];
- }
- else if (realValue >= CONTRACTCHARINDEX)
- {
- EntryPair pair = null;
- Vector groupList = (Vector)
- contractTable.elementAt(realValue
- - CONTRACTCHARINDEX);
- pair = (EntryPair)groupList.lastElement();
- valueList[j] = pair.value;
- }
- else
- {
- valueList[j] = realValue;
- }
- }
- }
- }
- }
- }
- /**
- * Returns true if a character is a seperator.
- */
- private final boolean isSpecialChar(char c)
- {
- return (c=='/' || c==',' || c==';' || c=='<' ||
- c=='@' || c=='=');
- }
- /**
- * Increment of the last order based on the comparison level.
- */
- private final int increment(int aStrength, int lastValue)
- {
- switch(aStrength)
- {
- case Collator.PRIMARY:
- lastValue += PRIMARYORDERINCREMENT;
- lastValue &= PRIMARYORDERMASK;
- break;
- case Collator.SECONDARY:
- lastValue += SECONDARYORDERINCREMENT;
- lastValue &= SECONDARYDIFFERENCEONLY;
- if (isOverIgnore)
- maxSecOrder++;
- break;
- case Collator.TERTIARY:
- lastValue += TERTIARYORDERINCREMENT;
- if (isOverIgnore)
- maxTerOrder++;
- break;
- }
- return lastValue;
- }
- /**
- * Adds a character and its designated order into the collation table.
- */
- private final void addOrder(char ch,
- int aStrength)
- {
- int order = mapping.elementAt(ch);
- if (order == UNMAPPED)
- {
- currentOrder = increment(aStrength, currentOrder);
- mapping.setElementAt(ch, currentOrder);
- } else if (order < 0) {
- int entry = order & SECONDARYRESETMASK;
- int value = CONTRACTCHARINDEX + entry;
- key.setLength(0);
- key.append(ch);
- Vector list = getContractValues(entry);
- EntryPair pair = new EntryPair();
- pair.entryName = key.toString();
- currentOrder = increment(aStrength, currentOrder);
- pair.value = currentOrder;
- mapping.setElementAt(ch, value);
- list.insertElementAt(pair, 0);
- } else if (order > CONTRACTCHARINDEX) {
- key.setLength(0);
- key.append(ch);
- addContractOrder(key.toString(), aStrength);
- }
- }
- /**
- * Adds the contracting string into the collation table.
- */
- private final void addContractOrder(String groupChars,
- int aStrength)
- {
- if (contractTable == null)
- {
- contractTable = new Vector(INITIALTABLESIZE);
- }
- // Look for the entry, for example c as in ch entry
- key.setLength(0);
- key.append(groupChars.charAt(0));
- int entry = UNMAPPED;
- Vector tableEntry = null;
- EntryPair pair = new EntryPair();
- int i;
- for (i = 0; i < contractTable.size(); i++)
- {
- tableEntry = (Vector)contractTable.elementAt(i);
- if ((entry = getEntry(tableEntry, key.toString())) != UNMAPPED)
- break;
- }
- int lastValue = 0;
- if (aStrength != IDENTICAL)
- lastValue = increment(aStrength, currentOrder);
- else
- {
- lastValue = mapping.elementAt(groupChars.charAt(0));
- if (lastValue == UNMAPPED) {
- currentOrder = mapping.elementAt(lastChar);
- lastValue = increment(aStrength, currentOrder);
- }
- }
- if (entry != UNMAPPED) // found one
- {
- pair.entryName = groupChars;
- pair.value = lastValue;
- tableEntry.insertElementAt(pair, 0);
- }
- else
- {
- Vector valueTable = new Vector(INITIALTABLESIZE);
- int tmpValue = CONTRACTCHARINDEX + contractTable.size();
- // put last char in the subdict
- int order = mapping.elementAt(groupChars.charAt(0));
- if (order == UNMAPPED) {
- pair = null;
- mapping.setElementAt(groupChars.charAt(0),
- PRIMARYORDERMASK + contractTable.size());
- } else {
- pair.entryName = key.toString();
- mapping.setElementAt(groupChars.charAt(0), tmpValue);
- pair.value = order;
- valueTable.insertElementAt(pair, 0);
- }
- EntryPair swapPair = new EntryPair();
- swapPair.entryName = groupChars;
- swapPair.value = lastValue;
- valueTable.insertElementAt(swapPair, 0);
- contractTable.insertElementAt(valueTable, contractTable.size());
- }
- if (aStrength != IDENTICAL)
- currentOrder = lastValue;
- }
-
- private final int getEntry(Vector list, String name) {
- for (int i = 0; i < list.size(); i++) {
- EntryPair pair = (EntryPair)list.elementAt(i);
- if (pair.entryName.equals(name)) {
- return i;
- }
- }
- return UNMAPPED;
- }
- /**
- * Get the entry of hash table of the contracting string in the collation
- * table.
- * @param ch the starting character of the contracting string
- */
- Vector getContractValues(char ch)
- {
- int index = mapping.elementAt(ch);
- return getContractValues(index - CONTRACTCHARINDEX);
- }
-
- Vector getContractValues(int index)
- {
- if (index >= 0)
- {
- return (Vector)contractTable.elementAt(index);
- }
- else // not found
- {
- return null;
- }
- }
-
- /**
- * Adds the expanding string into the collation table.
- */
- private final void addExpandOrder(String contractChars,
- String expandChars,
- int aStrength) throws ParseException
- {
- EntryPair pair = new EntryPair();
- // INITIALTABLESIZE is an estimated number
- if (expandTable == null)
- {
- expandTable = new Vector(INITIALTABLESIZE);
- }
- int[] valueList = new int[expandChars.length()+1];
- // Expand flag + index
- int tmpValue = EXPANDCHARINDEX + expandTable.size();
- // need to check if the entry is key or not later
- key.setLength(0);
- int keyValue = UNMAPPED;
- if (contractChars.length() > 1)
- {
- addContractOrder(contractChars, aStrength);
- lastChar = contractChars.charAt(0);
- Vector list = getContractValues(contractChars.charAt(0));
- int entry = UNMAPPED;
- entry = getEntry(list, contractChars);
- if (entry != UNMAPPED) {
- pair = (EntryPair)list.elementAt(entry);
- keyValue = pair.value;
- }
- pair.entryName = contractChars;
- pair.value = tmpValue;
- }
- else
- {
- char ch = contractChars.charAt(0);
- if (mapping.elementAt(ch) == UNMAPPED) {
- addOrder(ch, aStrength);
- lastChar = ch;
- }
- keyValue = mapping.elementAt(lastChar);
- mapping.setElementAt(lastChar, tmpValue);
- }
- valueList[0] = keyValue;
- for (int i = 0; i < expandChars.length(); i++)
- {
- int mapValue = mapping.elementAt(expandChars.charAt(i));
- if (mapValue >= CONTRACTCHARINDEX)
- {
- key.append(expandChars.charAt(i));
- int foundValue = CHARINDEX + expandChars.charAt(i);
- Vector list = getContractValues(expandChars.charAt(i));
- if (list != null) {
- int entry = UNMAPPED;
- entry = getEntry(list, key.toString());
- if (entry != UNMAPPED) {
- pair = (EntryPair)list.elementAt(entry);
- foundValue = pair.value;
- }
- }
- key.setLength(0);
- valueList[i+1] = foundValue;
- }
- else if (mapValue != UNMAPPED)
- {
- valueList[i+1] = mapValue;
- }
- else
- {
- valueList[i+1] = CHARINDEX + (int)(expandChars.charAt(i));
- }
- }
- expandTable.insertElementAt(valueList, expandTable.size());
- }
-
- /**
- * Get the entry of hash table of the expanding string in the collation
- * table.
- * @param ch the starting character of the expanding string
- */
- final int[] getExpandValueList(char ch)
- {
- int expIndex = mapping.elementAt(ch);
- if ((expIndex >= EXPANDCHARINDEX) &&
- (expIndex < CONTRACTCHARINDEX))
- {
- int tmpIndex = expIndex - EXPANDCHARINDEX;
- return (int[])expandTable.elementAt(tmpIndex);
- }
- else
- {
- return null;
- }
- }
- /**
- * Get the entry of hash table of the expanding string in the collation
- * table.
- * @param idx the index of the expanding string value list
- */
- final int[] getExpandValueList(int idx)
- {
- if (idx < expandTable.size())
- {
- return (int[])expandTable.elementAt(idx);
- }
- else
- {
- return null;
- }
- }
- /**
- * Get the comparison order in the desired strength. Ignore the other
- * differences.
- * @param order The order value
- */
- private final int strengthOrder(int order)
- {
- if (getStrength() == Collator.PRIMARY)
- {
- order &= PRIMARYDIFFERENCEONLY;
- } else if (getStrength() == Collator.SECONDARY)
- {
- order &= SECONDARYDIFFERENCEONLY;
- }
- return order;
- }
- /**
- * Check if a comparison order is ignorable.
- * @return true if a character is ignorable, false otherwise.
- */
- final boolean isIgnorable(int order)
- {
- return (((int)CollationElementIterator.primaryOrder(order) == 0) ?
- true : false);
- }
- /**
- * Get the comarison order of a character from the collation table.
- * @return the comparison order of a character.
- */
- final int getUnicodeOrder(char ch)
- {
- return mapping.elementAt(ch);
- }
-
- /**
- * Check for the secondary and tertiary differences of source and
- * target comparison orders.
- * @return Collator.LESS if sOrder < tOrder; EQUAL if sOrder == tOrder;
- * Collator.GREATER if sOrder > tOrder.
- */
- private final int checkSecTerDiff(int sOrder,
- int tOrder,
- int result)
- {
- int endResult = result;
- if (CollationElementIterator.secondaryOrder(sOrder) !=
- CollationElementIterator.secondaryOrder(tOrder))
- {
- if (isFrenchSec ||
- ((endResult == Collator.EQUAL) ||
- (strengthResult != Collator.SECONDARY)))
- {
- strengthResult = Collator.SECONDARY;
- if (CollationElementIterator.secondaryOrder(sOrder) <
- CollationElementIterator.secondaryOrder(tOrder))
- endResult = Collator.LESS;
- else
- endResult = Collator.GREATER;
- }
- }
- else if ((CollationElementIterator.tertiaryOrder(sOrder) !=
- CollationElementIterator.tertiaryOrder(tOrder)) &&
- ((endResult == Collator.EQUAL) || isFrenchSec))
- {
- strengthResult = Collator.TERTIARY;
- if (CollationElementIterator.tertiaryOrder(sOrder) <
- CollationElementIterator.tertiaryOrder(tOrder))
- endResult = Collator.LESS;
- else
- endResult = Collator.GREATER;
- }
- return endResult;
- }
- /**
- * Reverse a string.
- */
- private final void reverse (StringBuffer result)
- {
- String store = result.toString();
- result.setLength(0);
- for (int i = store.length() - 1; i >= 0; i--) {
- result.append(store.charAt(i));
- }
- }
-
- static int CHARINDEX = 0x70000000; // need look up in .commit()
- static int EXPANDCHARINDEX = 0x7E000000; // Expand index follows
- static int CONTRACTCHARINDEX = 0x7F000000; // contract indexes follow
- static int UNMAPPED = 0xFFFFFFFF;
-
- private final static int SHORT_MAX_VALUE = 32767;
- private final static int PRIMARYORDERINCREMENT = 0x00010000;
- private final static int MAXIGNORABLE = 0x00010000;
- private final static int SECONDARYORDERINCREMENT = 0x00000100;
- private final static int TERTIARYORDERINCREMENT = 0x00000001;
- final static int PRIMARYORDERMASK = 0xffff0000;
- final static int SECONDARYORDERMASK = 0x0000ff00;
- final static int TERTIARYORDERMASK = 0x000000ff;
- private final static int SECONDARYRESETMASK = 0x0000ffff;
- private final static int IGNORABLEMASK = 0x0000ffff;
- private final static int PRIMARYDIFFERENCEONLY = 0xffff0000;
- private final static int SECONDARYDIFFERENCEONLY = 0xffffff00;
- private final static int INITIALTABLESIZE = 20;
- private final static int MAXKEYSIZE = 5;
- static int PRIMARYORDERSHIFT = 16;
- static int SECONDARYORDERSHIFT = 8;
- private final static int MAXTOKENLEN = 256;
- private final static int MAXRULELEN = 512;
- private final static int COLLATIONKEYOFFSET = 1;
-
- private boolean isFrenchSec = false;
- private String ruleTable = null;
-
- private CompactIntArray mapping = null;
- private Vector contractTable = null;
- private Vector expandTable = null;
-
- // transients, only used in build or processing
- private transient MergeCollation mPattern = null;
- private transient boolean isOverIgnore = false;
- private transient int currentOrder = 0;
- private transient short maxSecOrder = 0;
- private transient short maxTerOrder = 0;
- private transient char lastChar;
- private transient StringBuffer key = new StringBuffer(MAXKEYSIZE);
- private transient int strengthResult = Collator.IDENTICAL;
- private transient StringBuffer primResult = new StringBuffer(MAXTOKENLEN);
- private transient StringBuffer secResult = new StringBuffer(MAXTOKENLEN);
- private transient StringBuffer terResult = new StringBuffer(MAXTOKENLEN);
- }
-
-