Achim,
The classes in 2nd-level packages (like in
org.apache.commons.collections.map) are 'decorators'. They are not
interfaces (like MultiMap), and not self-contained implementations (like
MultiHashMap). Most decorators are actually exposed as methods of
MapUtils class, so an ordinary user does not need to worry about
2nd-level packages at all, just import org.apache.commons.collections.*
to get MultiMap, MultiHashMap, MapUtils and almost 98.3% of the
functionality of commons-collections.
Probably, these 2nd-level packages should be documented separately, to
avoid confusion.
--
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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