[jira] [Assigned] (LUCENENET-616) Make Collections from Lucene.Net.Support into a 1st Class Feature

["Shad Storhaug (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENENET-616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shad Storhaug reassigned LUCENENET-616:
---------------------------------------

    Assignee: Shad Storhaug

> 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
>            Assignee: Shad Storhaug
>            Priority: Major
>
> The collection types 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 best 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.Specialized}} namespace
>  # The collection types should stay in the {{Support}} folder, but be moved into a {{Collections/Specialized}} 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], by making many of them into extension methods.
>  # 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}}, for example a generic 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 behaves and how its behavior differs 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
>  # There should be a "namespace document" in {{Lucene.Net.Collections.Generic}} that lists all of the collection types and a summary of their behavior, so they can be comparison shopped easily
> Since these are breaking API changes, they should be done before the official release of Lucene.Net 4.8.0.
> Generally speaking, collections were fully implemented and tested to prevent odd bugs from creeping into Lucene.Net but it wouldn't hurt to review to ensure that is the case.



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