ImmutableListMultimap.copyOf(Map<K, List<V>>), etc.

[gissuebot]

Original issue created by [email protected] on 2010-11-03 at 01:14 PM

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I think it would be useful to transform a JDK like implementation of multimap (i.e. Map<K, ? extends Collection<V>>) directly into an immutable multimap (w/o needing to create a non-immutable multimap first).

The workaround is to use a builder...

[gissuebot]

Original comment posted by joe.j.kearney on 2010-11-03 at 05:57 PM

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If this is added I think an extra wildcard on the parameter should be considered:

<K,V> ImmutableMultimap<K,V> ImmutableMultimap.copyOf(Map<? extends K, ? extends Collection<V>>)

This was discussed in this thread, too:
http://groups.google.com/group/guava-discuss/browse_thread/thread/f1b947827bf5b6d

[gissuebot]

Original comment posted by [email protected] on 2011-01-27 at 06:01 AM

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(No comment entered for this change.)

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Status: Accepted
Labels: Type-Enhancement

[gissuebot]

Original comment posted by [email protected] on 2011-03-31 at 12:26 PM

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Is this somewhat related to issue #320? Would ImmutableMultimap.copyOf(Iterable<Map.Entry<K, V>>), called with someMultimap.entries(), be a possible compromise?

What are those "JDK like implementation[s] of multimap" exactly? Wouldn't they support the interface I suggested above?

[gissuebot]

Original comment posted by [email protected] on 2011-07-13 at 06:18 PM

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(No comment entered for this change.)

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Status: Triaged

[gissuebot]

Original comment posted by [email protected] on 2011-11-20 at 03:32 PM

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By "JDK like implementations of multimap" I mean:
java.util.Map<K, ? extends Collection<V>>
In other words, a regular Map where each key is mapped to a collection.

For such a Map, there's no easy way to get an Iterable<Map.Entry<K, V>>... Calling entrySet() on such a Map will return Iterable<Map.Entry<K, Collection<V>>>.

The idea is to give an easy way to "translate" existing legacy code (that uses JDK) to Guavable code that uses Multimaps.

[gissuebot]

Original comment posted by [email protected] on 2011-12-10 at 03:51 PM

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(No comment entered for this change.)

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Labels: Package-Collect

[gissuebot]

Original comment posted by [email protected] on 2012-02-16 at 07:17 PM

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(No comment entered for this change.)

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Status: Acknowledged

[gissuebot]

Original comment posted by [email protected] on 2012-05-30 at 07:43 PM

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(No comment entered for this change.)

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Labels: -Type-Enhancement, Type-Addition

[gissuebot]

Original comment posted by [email protected] on 2012-06-22 at 06:16 PM

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(No comment entered for this change.)

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Status: Research

[gissuebot]

Original comment posted by wasserman.louis on 2013-03-16 at 03:52 AM

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Issue #1341 has been merged into this issue.

[kevinb9n]

We should research current builder usages to learn what common things we might want to streamline.