package com.jclark.xsl.util;

import java.util.Locale;
import java.text.Collator;

public class TextComparator implements Comparator {
  private Collator collator;
  
  public static final int UPPER_FIRST = 1;
  public static final int LOWER_FIRST = 2;

  public static Comparator create(Locale locale, int caseOrder) {
    TextComparator cmp = new TextComparator(locale);
    // Might be better to handle this by diddling the rules
    // JDK does lower-first; it would be better not to assume this
    if ((caseOrder & UPPER_FIRST) == 0)
      return cmp;
    if (locale == null)
      locale = locale.getDefault();
    if (locale.getLanguage().equals("tr"))
      return new TurkishSwapCaseComparator(cmp);
    return new SwapCaseComparator(cmp);
  }

  private TextComparator(Locale locale) {
    if (locale == null)
      collator = Collator.getInstance();
    else
      collator = Collator.getInstance(locale);
    collator.setStrength(Collator.TERTIARY);
  }

  public int compare(Object obj1, Object obj2) {
    return collator.compare((String)obj1, (String)obj2);
  }

}