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JBR-8664 Optimize sun.nio.fs.WindowsPath.compareTo

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This commit is contained in:
Vladimir Lagunov
2025-05-14 17:20:12 +02:00
committed by jbrbot
parent 10b6422964
commit dccecc5133
1 changed files with 13 additions and 17 deletions
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30
src/java.base/windows/classes/sun/nio/fs/WindowsPath.java
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@@ -64,6 +64,9 @@ class WindowsPath implements Path {
// paths and has a long path prefix for all paths longer than MAX_PATH.
private volatile WeakReference<String> pathForWin32Calls;
// Used for fast string comparison.
private volatile WeakReference<byte[]> uppercasePath;
// offsets into name components (computed lazily)
private volatile Integer[] offsets;
@@ -786,23 +789,7 @@ class WindowsPath implements Path {
public int compareTo(Path obj) {
if (obj == null)
throw new NullPointerException();
String s1 = path;
String s2 = ((WindowsPath)obj).path;
int n1 = s1.length();
int n2 = s2.length();
int min = Math.min(n1, n2);
for (int i = 0; i < min; i++) {
char c1 = s1.charAt(i);
char c2 = s2.charAt(i);
if (c1 != c2) {
c1 = Character.toUpperCase(c1);
c2 = Character.toUpperCase(c2);
if (c1 != c2) {
return c1 - c2;
}
}
}
return n1 - n2;
return Arrays.compareUnsigned(getUppercasePath(), ((WindowsPath)obj).getUppercasePath());
}
@Override
@@ -885,6 +872,15 @@ class WindowsPath implements Path {
}
}
private byte[] getUppercasePath() {
byte[] result = uppercasePath != null ? uppercasePath.get() : null;
if (result == null) {
result = path.toUpperCase().getBytes();
uppercasePath = new WeakReference<>(result);
}
return result;
}
@Override
public URI toUri() {
return WindowsUriSupport.toUri(this);