lucenenet-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrei Iliev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENENET-292) Optimization of EquatableList<T>
Date Sat, 21 Nov 2009 17:16:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENENET-292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781011#action_12781011
] 

Andrei Iliev commented on LUCENENET-292:
----------------------------------------

I agree. That was the reason why initially I did not want to make a complete port over java's
ArrayList. It is not so easy as it may seem. All we needed for now is just to 2 helpful methods
to calculate HashCode and check for Equals.



> Optimization of EquatableList<T>
> --------------------------------
>
>                 Key: LUCENENET-292
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-292
>             Project: Lucene.Net
>          Issue Type: Improvement
>            Reporter: Nicholas Paldino
>            Priority: Minor
>         Attachments: EquatableList3.patch, SupportClass.patch
>
>
> When comparing two IEnumerable<T> implementations, a shortcut can be taken to check
to see if both IEnumerable<T> expose operations which returns a count of items (sequences
cannot be equal if the number of elements in the sequences are not equal).
> Typically, in .NET, this is expressed through the implementation of the ICollection or
ICollection<T> interface.
> Before enumerating through each element and comparing the two for equality, if the counts
are accessible, they should be compared to see if the number of elements in the two sequences
are equal.  If a comparison is able to be made before enumerating, it will be much more performant
for comparisons of sequences where each is ~N, but both are not equal to N, and N is very
large.
> Patch to follow.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message