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8240094: Optimize empty substring handling

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Reviewed-by: redestad, igerasim, jlaskey
This commit is contained in:
Sergei Tsypanov 2020-02-26 21:24:02 +01:00 • committed by Claes Redestad
parent 257de28b2c
commit f729514ebd
4 changed files with 23 additions and 18 deletions
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11
src/java.base/share/classes/java/lang/StringLatin1.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -630,17 +630,11 @@ final class StringLatin1 {
public static String stripLeading(byte[] value) {
int left = indexOfNonWhitespace(value);
if (left == value.length) {
return "";
}
return (left != 0) ? newString(value, left, value.length - left) : null;
}
public static String stripTrailing(byte[] value) {
int right = lastIndexOfNonWhitespace(value);
if (right == 0) {
return "";
}
return (right != value.length) ? newString(value, 0, right) : null;
}
@ -764,6 +758,9 @@ final class StringLatin1 {
}
public static String newString(byte[] val, int index, int len) {
if (len == 0) {
return "";
}
return new String(Arrays.copyOfRange(val, index, index + len),
LATIN1);
}