[jexl] Number coercion in assignments and method calls

[Iskander Absalyamov <ab...@gmail.com>]

What is a good way to make JEXL 2.1 coerce int/double values to
BigDecimal outside arithmetic expressions? So that one could write:
    someBean.someBigDecimalProperty = 1;
instead of:
    someBean.someBigDecimalProperty = 1.0b;

This is needed because non-technical users don't understand the
difference. Also, this seems a reasonable requirement because
JexlArithmetic does it already.

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Re: [jexl] Number coercion in assignments and method calls

[Iskander Absalyamov <ab...@gmail.com>]

Thank you, Henri!

I'll add:
/** Use only in JEXL scripts. */
@Deprecated
public void setSomeBigDecimalProperty(Number n) {...}

With overriding Interpreter.setAttribute(...), one would also need to
override methods instantiating it.

I can't use snapshots.

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Re: [jexl] Number coercion in assignments and method calls

[henrib <he...@apache.org>]

Hi;
The easiest solution would be by flanking the problem altogether by adding a
'public void setSomeBigDecimalProperty(Number n)' or 'public void
setSomeBigDecimalProperty(double d)' method  to your 'someBean' class.

The other possible solutions:
1/ derive the Interpreter to override the 'setAttribute' method to 'widen'
(on top of trying to 'narrow') the method argument when dealing with a
number property, i.e. try to find a method by casting the argument to
BigDecimal (uberspect.getPropertySet(...)).
2/ some way to define the default number literal class (so 1 is indeed
evaluated as BigDecimal("1")) but there is no such thing in 2.1; I can try
adding this in 3.0 if you can use snapshots.

Cheers,
Henrib



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