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8137326: Methods for comparing CharSequence, StringBuilder, and StringBuffer

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Reviewed-by: rriggs, smarks, sherman, tvaleev
This commit is contained in:
Joe Wang 2018-03-01 15:31:04 -08:00
parent 17b8a043c4
commit 5a7aff9897
10 changed files with 651 additions and 13 deletions
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25
src/java.base/share/classes/java/lang/AbstractStringBuilder.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2018, 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
@ -88,6 +88,29 @@ abstract class AbstractStringBuilder implements Appendable, CharSequence {
}
}
/**
* Compares the objects of two AbstractStringBuilder implementations lexicographically.
*
* @since 11
*/
int compareTo(AbstractStringBuilder another) {
if (this == another) {
return 0;
}
byte val1[] = value;
byte val2[] = another.value;
int count1 = this.count;
int count2 = another.count;
if (coder == another.coder) {
return isLatin1() ? StringLatin1.compareTo(val1, val2, count1, count2)
: StringUTF16.compareTo(val1, val2, count1, count2);
}
return isLatin1() ? StringLatin1.compareToUTF16(val1, val2, count1, count2)
: StringUTF16.compareToLatin1(val1, val2, count1, count2);
}
/**
* Returns the length (character count).
*