package ch.cyberduck.core;
/*
* @(#)OSXCollator.java
*
* Copyright (c) 2004-2007 Werner Randelshofer
* Staldenmattweg 2, Immensee, CH-6405, Switzerland.
* All rights reserved.
*
* The copyright of this software is owned by Werner Randelshofer.
* You may not use, copy or modify this software, except in
* accordance with the license agreement you entered into with
* Werner Randelshofer. For details see accompanying license terms.
*/
import java.text.CollationKey;
import java.text.Collator;
import java.text.ParseException;
import java.text.RuleBasedCollator;
import java.util.Locale;
/**
* The OSXCollator strives to match the collation rules used by the Mac OS X
* Finder and of Mac OS X file dialogs.
* <p/>
* If we wanted to match the OS X collation rules exactly, we would have to
* implement the rules for all languages supported by Mac OS X and Java.
* To reduce the amount of work needed for implementing these rules, the
* OSXCollator changes the collation rules returned by
* java.text.Collator.getInstance() to do the following:
* <ul>
* <li>Space characters are treated as primary collation differences</li>
* <li>Hyphen characters are treated as primary collation differences</li>
* <li>Sequence of digits (characters '0' through '9') is treated as a single
* collation object. The current implementation supports sequences of up to
* 999 characters length.</li>
* </ul>
* If java.text.Collator.getInstance() does not return an instance of
* java.text.RuleBasedCollator, then the returned collator is used, and only
* sequences of digits are changed to match the collation rules of Mac OS X.
*
* @author Werner Randelshofer
* @version $Id: NaturalOrderCollator.java 5626 2009-12-19 23:30:40Z dkocher $
*/
public class NaturalOrderCollator extends Collator {
/**
* @uml.property name="collator"
*/
private Collator collator;
public NaturalOrderCollator() {
this(Locale.getDefault());
}
public NaturalOrderCollator(Locale locale) {
collator = Collator.getInstance(locale);
if(collator instanceof RuleBasedCollator) {
String rules = ((RuleBasedCollator) collator).getRules();
// If hyphen is ignored except for tertiary difference, make it
// a primary difference, and move in front of the first primary
// difference found in the rules
int pos = rules.indexOf(",'-'");
int primaryRelationPos = rules.indexOf('<');
if(primaryRelationPos == rules.indexOf("'<'")) {
primaryRelationPos = rules.indexOf('<', primaryRelationPos + 2);
}
if(pos != -1 && pos < primaryRelationPos) {
rules = rules.substring(0, pos)
+ rules.substring(pos + 4, primaryRelationPos)
+ "<'-'"
+ rules.substring(primaryRelationPos);
}
// If space is ignored except for secondary and tertiary
// difference, make it a primary difference, and move in front
// of the first primary difference found in the rules
pos = rules.indexOf(";' '");
primaryRelationPos = rules.indexOf('<');
if(primaryRelationPos == rules.indexOf("'<'")) {
primaryRelationPos = rules.indexOf('<', primaryRelationPos + 2);
}
if(pos != -1 && pos < primaryRelationPos) {
rules = rules.substring(0, pos)
+ rules.substring(pos + 4, primaryRelationPos)
+ "<' '"
+ rules.substring(primaryRelationPos);
}
try {
collator = new RuleBasedCollator(rules);
}
catch(ParseException e) {
e.printStackTrace();
}
}
}
@Override
public int compare(String source, String target) {
return collator.compare(expandNumbers(source), expandNumbers(target));
}
@Override
public CollationKey getCollationKey(String source) {
return collator.getCollationKey(expandNumbers(source));
}
@Override
public boolean equals(Object o) {
if(o instanceof NaturalOrderCollator) {
NaturalOrderCollator that = (NaturalOrderCollator) o;
return this.collator.equals(that.collator);
}
else {
return false;
}
}
public int hashCode() {
return collator.hashCode();
}
private String expandNumbers(String s) {
if(s == null) {
return null;
}
StringBuilder out = new StringBuilder();
StringBuilder digits = new StringBuilder();
for(int i = 0, n = s.length(); i < n; i++) {
char ch = s.charAt(i);
//if (Character.isDigit(ch)) {
if(ch >= '0' && ch <= '9') {
digits.append(ch);
}
else {
if(digits.length() != 0) {
if(digits.length() < 10) {
out.append("00");
out.append(digits.length());
}
else if(digits.length() < 100) {
out.append("0");
out.append(digits.length());
}
else if(digits.length() < 1000) {
out.append(digits.length());
}
else if(digits.length() > 999) {
out.append("999");
}
out.append(digits.toString());
digits.delete(0, digits.length());
}
out.append(ch);
}
}
if(digits.length() != 0) {
if(digits.length() < 10) {
out.append("00");
out.append(digits.length());
}
else if(digits.length() < 100) {
out.append("0");
out.append(digits.length());
}
else if(digits.length() < 1000) {
out.append(digits.length());
}
else if(digits.length() > 999) {
out.append("999");
}
out.append(digits);
}
return out.toString();
}
}