/lib/saxonB/net/sf/saxon/sort/UppercaseFirstCollator.java
Java | 104 lines | 44 code | 13 blank | 47 comment | 17 complexity | 8f653804fdaa2fb768d3e0c15e8d91a4 MD5 | raw file
- package net.sf.saxon.sort;
-
- /**
- * A Collator used for comparing strings, with upper case collated before lower case
- * if the strings are otherwise equal. This is implemented as a wrapper around a collator
- * that compares the strings ignoring case.
- *
- * @author Michael H. Kay
- *
- */
-
- public class UppercaseFirstCollator implements StringCollator, java.io.Serializable {
-
- private StringCollator baseCollator;
-
- /**
- * Create an UppercaseFirstCollator
- * @param base the base collator used to compare strings irrespective of case
- */
-
- public UppercaseFirstCollator(StringCollator base) {
- baseCollator = base;
- }
-
- /**
- * Compare two string objects: case is irrelevant, unless the strings are equal ignoring
- * case, in which case uppercase comes first.
- * @return <0 if a<b, 0 if a=b, >0 if a>b
- * @throws ClassCastException if the objects do not implement the CharSequence interface
- */
-
- public int compareStrings(String a, String b) {
- int diff = baseCollator.compareStrings(a, b);
- if (diff != 0) {
- return diff;
- }
-
- // This is doing a character-by-character comparison, which isn't really right.
- // There might be a sequence of letters constituting a single collation unit.
-
- int i = 0;
- int j = 0;
- while (true) {
- // Skip characters that are equal in the two strings
- while (i < a.length() && j < b.length() && a.charAt(i) == b.charAt(j)) {
- i++;
- j++;
- }
- // Skip non-letters in the first string
- while (i < a.length() && !Character.isLetter(a.charAt(i))) {
- i++;
- }
- // Skip non-letters in the second string
- while (j < b.length() && !Character.isLetter(b.charAt(j))) {
- j++;
- }
- // if either string is exhausted, treat the strings as equal
- if (i >= a.length()) {
- return 0;
- }
- if (j >= b.length()) {
- return 0;
- }
- // if one character is upper case and the other isn't, the issue is decided
- boolean aUpper = Character.isUpperCase(a.charAt(i++));
- boolean bUpper = Character.isUpperCase(b.charAt(j++));
- if (aUpper && !bUpper) {
- return -1;
- }
- if (bUpper && !aUpper) {
- return +1;
- }
- }
- }
-
- /**
- * Get a collation key for two Strings. The essential property of collation keys
- * is that if two values are equal under the collation, then the collation keys are
- * compare correctly under the equals() method.
- */
-
- public Object getCollationKey(String s) {
- return baseCollator.getCollationKey(s);
- }
-
- }
-
- //
- // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
- // you may not use this file except in compliance with the License. You may obtain a copy of the
- // License at http://www.mozilla.org/MPL/
- //
- // Software distributed under the License is distributed on an "AS IS" basis,
- // WITHOUT WARRANTY OF ANY KIND, either express or implied.
- // See the License for the specific language governing rights and limitations under the License.
- //
- // The Original Code is: all this file.
- //
- // The Initial Developer of this module is Michael H. Kay.
- //
- // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
- //
- // Contributor(s): none.
- //