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From "Michael Sean Mickey (JIRA)" <j...@apache.org>
Subject [jira] Created: (LANG-627) Include a way to explicitly define a hash constant for each primitive type, along with the functionality described in LANG-411
Date Thu, 24 Jun 2010 16:06:50 GMT
Include a way to explicitly define a hash constant for each primitive type, along with the
functionality described in LANG-411
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                 Key: LANG-627
                 URL: https://issues.apache.org/jira/browse/LANG-627
             Project: Commons Lang
          Issue Type: Improvement
          Components: lang.*
    Affects Versions: 3.0
            Reporter: Michael Sean Mickey
            Priority: Minor


Regarding LANG-411, the description mentions 2 parameters for each hash operation: the first
a parameter to hold the type instance to be hashed, the second a hash multiplier.

Shouldn't there also be a way to define a specific hash constant value as well? Joshua Bloch
refers to this value as the starting value for "result" in his examples and the HashCodeBuilder
code maintains an internal field named: iTotal for this value. It doesn't seem to make sense
to add a parameter to the hashing operations for a starting hash constant value, but it probably
makes sense to add mutators that allow setting this value across any given type. For example:
setIntHashConstant, setBoolHashConstant, setLongHashConstant, etc. Default values could be
defined so that explicit hash constants are not required.

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