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From: Dovlecel Alexandru Ovidiu <alexandru.dovlecel@siemens.com>
To: "'Apache Torque Users List'" <torque-user@db.apache.org>
Subject: RE: hashCode/equals contract broken in BaseObject
Date: Tue, 4 May 2004 17:05:57 +0300 
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You can use torque objects as hash keys with one condition: 

all the keys in the hashtable must be instances of the same torque class.
Then you will not have any inconsistency. 

-----Original Message-----
From: Shevek [mailto:shevek@anarres.org]
Sent: Tuesday, May 04, 2004 4:07 PM
To: Apache Torque Users List
Subject: hashCode/equals contract broken in BaseObject


hashCode and equals in BaseObject rely only on the primary key. This
breaks horribly (violates the general contract of hashCode()/equals()) if 
you compare two objects of different classes.

It MUST compare ob.getClass() as well as ob.getPrimaryKey() and include
ob.getClass().hashCode() in its hashCode() [by xor?] [or something
equivalent].

No doubt the reason for this violation is noted in the FAQ, but it seems
worth noting as a serious bug since it means I can't use Torque objects as 
hash keys.

S.

-- 
Shevek                                    http://www.anarres.org/
I am the Borg.                         http://www.gothnicity.org/

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