[Springframework-rcp-dev] [Spring-JIRA] Commented: (RCP-394) Number Constraints where not able to compare values which are numbers but not of the same type

[Peter De B. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/spring/browse/RCP-394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28039 ] 

Peter De Bruycker commented on RCP-394:
---------------------------------------

I've checked a NumberComparator in that can be used for this scenario:

use the method Constraints.range(Integer.valueOf(0), Integer.valueOf(10), NumberComparator.INSTANCE) to create the constraint.

then constraint.test(Double.valueOf(5.5) will return true.

> Number Constraints where not able to compare values which are numbers but not of the same type
> ----------------------------------------------------------------------------------------------
>
>                 Key: RCP-394
>                 URL: http://opensource.atlassian.com/projects/spring/browse/RCP-394
>             Project: Spring Framework Rich Client Project
>          Issue Type: Bug
>          Components: Helper Classes
>    Affects Versions: 0.1.0, 0.2.0
>            Reporter: Mathias Broekelmann
>            Assignee: Mathias Broekelmann
>
> consider a constraint as follows:
> Constraint constraint = new Range(0, 10);
> The expected behavior of the following test is to return true:
> constraint.test(new Double(5.5))
> but it fires a ClassCastException since Range wrapped the integers into their object types and the compareTo method of Integer casts its argument to Integer
> I have a use case with a JFormatedTextField which creates different number instances on different Inputs:
> input = 5 results in a Long instance
> input = 5.5 results in a Double instance
> This problem can be solved by a custom comparator but it is a pain for the user since he is not able to use the provided methods in Constraints class.

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