> I'm trying to implement something very much like an xsl if statement. To
> evaluate the test attribute I've been trying to use the
> BaseXPath.booleanValueOf method. Tracing it through, this works great up
> until the very end.
>
> BaseXPath.booleanValueOf() calls JaXPath.jaBooleanValueOf(), which correctly
> evaluates the test attribute and gets a list of Boolean.TRUE's or
> Boolean.FALSE's. However, it then calls BooleanFunction.evaluate() which
> says, there's something on the list, return true.
>From the XPath spec, it seems that a non-empty list is *true*, regardless
of the contents. Strange, but true.
If you're only concerned about the first item on the list, doing a
conversion through string() might help.
Effectively:
boolean( string( myList ) )
or the similar fooValueOf() call chain.
-bob
4.3 Boolean Functions
Function: boolean boolean(object)
The boolean function converts its argument to a boolean as follows:
* a number is true if and only if it is neither positive or negative zero nor NaN
* a node-set is true if and only if it is non-empty
* a string is true if and only if its length is non-zero
* an object of a type other than the four basic types is converted
to a boolean in a way that is dependent on that type
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