Hi everyone!
The String class has getChars(int srcBegin, int srcEnd, char[] dst, int
dstBegin) which is used to efficiently extract substrings, avoiding
unnecessary copying.
The AbstractStringBuilder has the method with the same signature.
I propose to add a default implementation of this method to the
CharSequence interface.
It can used, for example, in AbstractStringBuilder.append(CharSequence
s, int start, int end) instead of the for-loop.
This, in turn, allows to simplify
AbstractStringBuilder.append(CharSequence s).
In the webrev, I also included a few optimizations of the kind:
stringBuilder.append(string.substring(from, to)) =>
stringBuilder.append(string, from, to).
The later variant becomes more effective after the proposed fix.
BUGURL: https://bugs.openjdk.java.net/browse/JDK-8077242
WEBREV: http://cr.openjdk.java.net/~igerasim/8077242/00/webrev/
If people agree that this change is useful, I'll file a CCC request.
Sincerely yours,
Ivan
