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Date: Mon, 21 Aug 2006 12:20:17 -0700 (PDT)
From: "Daniel John Debrunner (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-1674) Investigate reducing the number of
 classes & methods  in DataDictionary used to represent system tables
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    [ http://issues.apache.org/jira/browse/DERBY-1674?page=comments#action_12429501 ] 
            
Daniel John Debrunner commented on DERBY-1674:
----------------------------------------------

Simple stats on class count and sizes in insane mode (from the classes folder, not size in the jar).
Revision: 432856
Number of RowFactory classes 21
Size of RowFactory classes 169252
org/apache/derby/iapi/sql/dictionary
Number of Dictionary api classes 47
Size of Dictionary api classes 216108
org/apache/derby/impl/sql/catalog
Number of Catalog impl classes 36
Size of Catalog impl classes 360173

> Investigate reducing the number of classes & methods  in DataDictionary used to represent system tables
> -------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1674
>                 URL: http://issues.apache.org/jira/browse/DERBY-1674
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Daniel John Debrunner
>         Assigned To: Daniel John Debrunner
>            Priority: Minor
>
> Currently two classes exists for each system table, one to represent the table (e.g.SYSTABLESRowFactory) , one to represent a row (e.g. TableDescriptor)
> Look at having a single row factory (CatalogRowFactory) and using polymorphism (method overloading) on the descriptor objects to perform the work
> that is done today (e.g. converting a descriptor to and from a Row object).
> In addition the DataDictionary has a specific method to drop each type of unique descriptor (e.g. dropSPSDescriptor, dropAliasDescriptor)
> Would it be possible to have a single dropDescriptor(UniqueSQLObjectDescriptor) method and again use polymorphism  on the descriptors.

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