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List:       jakarta-commons-dev
Subject:    [jira] Commented: (LANG-238) [lang] Add equals(type[]) to
From:       "Henri Yandell (JIRA)" <jira () apache ! org>
Date:       2006-12-31 19:52:22
Message-ID: 32991821.1167594742343.JavaMail.jira () brutus
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    [ http://issues.apache.org/jira/browse/LANG-238?page=comments#action_12461587 ] 
            
Henri Yandell commented on LANG-238:
------------------------------------

Trying again: 

NumberUtils.

public boolean allEqual( <T>[] array )  for  T = long, int, short, byte

public boolean allEqual( <T>[] array, T error ) for T = float, double

BooleanUtils.

public boolean allEqual( boolean[] array )
// allTrue and allFalse worth having? They seem useful.

ObjectUtils.

public boolean allEqual( Object[] array )  [uses .equals()]

----

equals(...) seems a dangerous name to choose, so I did allEqual(...) above.

The contract from min(...) would imply that an IllegalArgumentException should be \
thrown for:

allEqual( null )
allEqual( new int[0] )

I imagine that allEqual( new int[] { i } ) would be considered true rather than \
throwing an exception; except for the case of Double.NaN and Float.NaN.

Should the double/float alternatives have an error value? 



> [lang] Add equals(type[]) to NumberUtils
> ----------------------------------------
> 
> Key: LANG-238
> URL: http://issues.apache.org/jira/browse/LANG-238
> Project: Commons Lang
> Issue Type: Improvement
> Affects Versions: Nightly Builds
> Environment: Operating System: other
> Platform: Other
> Reporter: Paul Benedict
> Priority: Minor
> Fix For: 3.0
> 
> 
> It would be useful to add an equals() method like the current min and max
> methods which take an array type and determine if all the values are equal.
> I have found myself in need of this often. I have to retrieve objects from
> multiple data sources in parallel to build an array of complex object. To ensure
> validity, I always compare that my sub-retrievals returned the same number of
> objects as expected.

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