[jira] [Comment Edited] (JEXL-420) Error while comparing float and string value

["Henri Biestro (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JEXL-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17815391#comment-17815391 ] 

Henri Biestro edited comment on JEXL-420 at 2/7/24 6:14 PM:
------------------------------------------------------------

It is always possible to use an arithmetic (ie a JexlArithmetic derived class) of your choosing.
In your case, you might want to override the method:
{code:java}
public double toDouble(final Object val){code}
so it returns NaN when encountering a String.
Alternatively, you could override:
{code:java}
protected int compare(final Object left, final Object right, final JexlOperator operator){code}
to return a comparison value leading to false for the operator when catching an ArithmeticException.

As for the general case, I'd rather not weaken the type system; the empty string is already an (historic) convenient exception.


was (Author: henrib):
It is always possible to use an arithmetic (ie a JexlArithmetic derived class) of your choosing.
In your case, you might want to override the method {code}public double toDouble(final Object val){code} so it returns NaN when encountering a String.

As for the general case, I'd rather not weaken the type system; the empty string is already an (historic) convenient exception.

> Error while comparing float and string value
> --------------------------------------------
>
>                 Key: JEXL-420
>                 URL: https://issues.apache.org/jira/browse/JEXL-420
>             Project: Commons JEXL
>          Issue Type: Bug
>            Reporter: Xu Pengcheng
>            Priority: Major
>
> code:
> {code:java}
> 1.2 == ''{code}
> returns false
>  
> code:
> {code:java}
> 1.2 == 'a'{code}
> causes exception
> {code:java}
> Caused by: java.lang.ArithmeticException: Double coercion: (a){code}
>  
> Is it possible to check the right side is a number like string and return false if not?



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