Thanks Adrei,
I looked into viewcvs and understood.
Andrei Polushin wrote:
Probably, these 2nd-level packages should be documented separately, to
avoid confusion.
Please not! The factory / decorator methods e.g. in MultiMap are documented well, but for more
information it's OK to be able to look them up.
I'd still vote for putting any Map subtype in the subpackage. With no effort
one could add
public static Map multiMap();
to MapUtils and in there create a new instance (while the MultiHashMap is sent back to the
subpackage). The fact that it is no decoration but a specialization is of no interest for the user
as long as he knows how to obtain an instance. Personally I don't see much difference between
decoration by delegation to member of same supertyp and "decoration" by extending supertype and
override methods with super - delegation and further constraints / behaviours. Porting MultiHashMap
to the common decorator - pattern is formal work without special effort.
BTW: Does anyone know if there is a remarkable performance gap between collections by decoration /
collections by specialization?
kind regards,
Achim
--
Andrei Polushin
Achim Westermann writes:
Thanks Henning,
I did not find it because I searched in the
org.apache.commons.collections.map package. I knew the shifted
semantics of a multimap but after all it is still a map. Why isn't it
put under the package mentioned above? Wouldn't it be a good idea?
kind regards,
Achim
Henning P. Schmiedehausen wrote:
Achim Westermann <[EMAIL PROTECTED]> writes:
Hi list users,
As a newbie to commons collection I am searching for a MultiMap: A
Map with add (another value to key) and set (replace all old values
for key) operations that allows mapping multiple values to a single
key.
I just found a map with multiple keys for identical values... A I
blind?
http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/apache/commons/collections/MultiMap.html
http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/apache/commons/collections/MultiHashMap.html
--- cut ---
A MultiMap is a Map with slightly different semantics. Putting a value
into the map will add the value to a Collection at that key. Getting a
value will return a Collection, holding all the values put to that
key.
--- cut ---
Best regards
Henning
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