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ICU-1728

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Markus' update.

X-SVN-Rev: 8626
This commit is contained in:
Syn Wee Quek 2002-05-14 23:45:46 +00:00
parent d5c7b20828
commit c3fdacb7d0
1 changed files with 84 additions and 55 deletions
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139
icu4j/src/com/ibm/icu/text/UTF16.java
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@ -5,8 +5,8 @@
*******************************************************************************
*
* $Source: /xsrl/Nsvn/icu/icu4j/src/com/ibm/icu/text/UTF16.java,v $
* $Date: 2002/04/03 22:48:10 $
* $Revision: 1.19 $
* $Date: 2002/05/14 23:45:46 $
* $Revision: 1.20 $
*
*******************************************************************************
*/
@ -2129,60 +2129,89 @@ public final class UTF16
public int compare(Object a, Object b)
{
if (a == b) {
return 0;
return 0;
}
if (a == null) {
return -1;
}
if (b == null) {
return 1;
}
String sa = (String) a;
String sb = (String) b;
int lena = sa.length();
int lenb = sb.length();
int len = lena;
if (len > lenb) {
len = lenb;
}
for (int i = 0; i < len; ++i)
{
char ca = sa.charAt(i);
char cb = sb.charAt(i);
if (ca == cb) {
continue; // skip remap if equal
}
// start of only different section
// what this part does is to rearrange the characters 0xE000 to 0xFFFF
// to the region starting from 0xD800
// and shift the surrogate characters to above this region
if (ca >= LEAD_SURROGATE_MIN_VALUE) {
ca += (ca <= TRAIL_SURROGATE_MAX_VALUE) ? 0x2000 : -0x800;
}
if (cb >= LEAD_SURROGATE_MIN_VALUE) {
cb += (cb <= TRAIL_SURROGATE_MAX_VALUE) ? 0x2000 : -0x800;
}
// end of only different section
if (ca < cb) {
return -1;
}
return 1; // wasn't equal, so return 1
}
if (lena < lenb) {
return -1;
}
if (lena > lenb) {
return 1;
}
return 0;
if (a == null) {
return -1;
}
if (b == null) {
return 1;
}
String sa = (String) a;
String sb = (String) b;
int lena = sa.length();
int lenb = sb.length();
int len = lena;
if (len > lenb) {
len = lenb;
}
for (int i = 0; i < len; ++i)
{
char ca = sa.charAt(i);
char cb = sb.charAt(i);
if (ca == cb) {
continue; // skip remap if equal
}
// start of only different section
// if either code unit is below 0xd800, i.e., below the
// surrogate range, then nothing needs to be done
// if both are >=0xd800 then special code adjusts code unit
// values so that all BMP code points (including single
// surrogate code points) sort below supplementary ones
// this is necessary because surrogates are not at the end of
// the code unit range
if (ca >= LEAD_SURROGATE_MIN_VALUE
&& cb >= LEAD_SURROGATE_MIN_VALUE) {
// subtract 0x2800 from BMP code points to make them
// smaller than supplementary ones
if ((ca <= LEAD_SURROGATE_MAX_VALUE && (i + 1) < lena
&& isTrailSurrogate(sa.charAt(i + 1)))
|| (isTrailSurrogate(ca) && i > 0
&& isLeadSurrogate(sa.charAt(i - 1)))) {
// part of a surrogate pair, leave >=d800
}
else {
// BMP code point - may be surrogate code point - make
// <d800
ca -= 0x2800;
}
if ((cb <= LEAD_SURROGATE_MAX_VALUE && (i + 1) < lenb
&& isTrailSurrogate(sb.charAt(i + 1)))
|| (isTrailSurrogate(cb) && i > 0
&& isLeadSurrogate(sb.charAt(i - 1)))) {
// part of a surrogate pair, leave >=d800
}
else {
// BMP code point - may be surrogate code point - make
// < d800
cb -= 0x2800;
}
}
// end of only different section
if (ca < cb) {
return -1;
}
return 1; // wasn't equal, so return 1
}
if (lena < lenb) {
return -1;
}
if (lena > lenb) {
return 1;
}
return 0;
}
}