On 05/28/13 16:03, Martin Buchholz wrote:
A long-returning size method seems like a framework-level decision. We could
add a default method to Collection.java and Map.java
default long mappingCount() { return size(); }
The lambda EG discussed this, and decided not to do it now,
and to put off support for 64bit collections until JDK9.
But CHM needs this now, so we picked a name that is usable
but not likely to clash with some better future name, like length().
-Doug
I'm not sure mappingCount is the best name, but all names will be confusing.
Using the name "length()" at least has an onomatopoeic mnemonic advantage - it
suggests that it might return a long.
/**
* Returns the number of mappings. This method should be used
* instead of {@link #size} because a ConcurrentHashMap may
* contain more mappings than can be represented as an int. The
* value returned is an estimate; the actual count may differ if
* there are concurrent insertions or removals.
*
* @return the number of mappings
*/
public long mappingCount() {
long n = sumCount();
return (n < 0L) ? 0L : n; // ignore transient negative values
}
