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From "Shad Storhaug (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENENET-616) Make Collections from Lucene.Net.Support into a 1st Class Feature
Date Wed, 14 Aug 2019 00:20:00 GMT
Shad Storhaug created LUCENENET-616:
---------------------------------------

             Summary: Make Collections from Lucene.Net.Support into a 1st Class Feature
                 Key: LUCENENET-616
                 URL: https://issues.apache.org/jira/browse/LUCENENET-616
             Project: Lucene.Net
          Issue Type: Improvement
          Components: Lucene.Net Core
    Affects Versions: Lucene.Net 4.8.0
            Reporter: Shad Storhaug


The collections in {{Lucene.Net.Support}} were originally sourced to support Lucene.Net itself.
While they were made public, they were not considered to be features that would be used by
anyone except for advanced users.

However, it has become clear by user reports that some parts of Lucene's design require specialized
collections that don't exist in the .NET Framework in order to properly function (see [LUCENENET-612|https://issues.apache.org/jira/projects/LUCENENET/issues/LUCENENET-612]
and [LUCENENET-615|https://issues.apache.org/jira/projects/LUCENENET/issues/LUCENENET-615].
.NET users are generally not familiar with these specialized collection types and assume that
when {{IDictionary<TKey, TValue>}} is required by an API that using {{Dictionary<TKey,
TValue>}} is their only choice. We need to improve documentation and increase visibility
of the specialized collection types in order to help them along.

# The collection types should be moved to a new {{Lucene.Net.Collections.Generic}} namespace
# The collection types should stay in the {{Support}} folder, but be moved into a {{Support/Collections/Generic}}
subfolder. The {{Collections}} class needs to be renamed to prevent a naming conflict - I
suggest following the same approach that was done in [ICU4N's Support folder|https://github.com/NightOwl888/ICU4N/tree/master/src/ICU4N/Support].
# The collection types should be named consistently according to .NET conventions, for example
{{HashMap}} should be renamed {{HashDictionary}}
# We should ensure we have a full set of tests for each collection, and that each collection
is fully implemented
# All collections must implement the expected interfaces from {{System.Collections.Generic}},
for example a dictionary should implement {{System.Collections.Generic.IDictionary<TKey,
TValue>}}
# The documentation for each collection should not just indicate where it was grabbed from,
but explain fully how it differs in behavior from other collection types
# APIs where it is known that specialized collections were intended to be used should also
be documented to indicate the choices the end user has so they don't automatically assume
they are constrained by the .NET framework's collection types

Since these are breaking API changes, they should be done before the official release of Lucene.Net
4.8.0



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