Re: API for expression language evaluation

[Sgarlata Matt]

Yes, there is.  For an example on how to add the EL to your own tags you 
can look at the struts-el tag libraries which are included as part of 
the Struts core.  I use the org.apache.strutsel.taglib.utils.EvalHelper 
class to evaluate EL expressions.  This ties my application to Struts, 
but I am comfortable with that.  If you are not, it should be simple to 
tie your classes only to the JSTL by only referencing the 
org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager 
class, which the EvalHelper depends on.

Matt

Johann Uhrmann wrote:

Hello,

is there an API for expression language evaluation?

E.g. it should be able to evaluate the following attribute values:

${bean.property}
  Should be evaluated to the property value of the bean.
${empty collection}
  should be evaluated to true/false
foobar
  should become the string "foobar".
Does the JSTL provide such an API?

Thank You,

Hans

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Matthew Sgarlata
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Booz Allen Hamilton Inc.
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