Re: ArrayList.propertyMissing ?

Roshan Dawrani wrote:

For collection objects, ".property" access works a little differently.

For the collection objects "<collection>.<someProperty>" syntax is part of
what is called GPath expression language (similar to XPath for XML). It is
used to navigate collections in groovy and retrieve all values of a specific
attributes from all its members.

Taking an example:

ArrayList.metaClass.methodMissing = {String name, args ->    println "Ok for
method missing - $name, $args" }

class MyName{def name; MyName(tmpName) {name = tmpName}}
def list = []

list.test("ok") // invokes methodMissing added on the metaClass above as
expected

list << new MyName("Roshan1"); list << new MyName("Roshan2")

// following does not result in propertyMissing as list is collection and
instead, it makes a list of "name" property values from all list members

println list.name


In your case, since the list is empty, list.test property also is an empty
list.

Another example - "println this.class.methods.name" - return names of all
the methods - by making a list of values of the "name" property on every
object in the collection returned by "this.class.methods"

rgds,
Roshan

On Wed, Sep 17, 2008 at 9:58 PM, melix <cedric.champeau@lingway.com> wrote:

> Hi,
>
> I have a subclass of ArrayList for which I would like to implement
> propertyMissing. However, I can't figure out how to do this. Seems that
> Groovy ignores it, while overriding methodMissing works like a charm.
>
> Here's an example :
>
> ArrayList.metaClass.methodMissing = { String name, args->
> println "Ok for method missing"
> }
> ArrayList.metaClass.propertyMissing = { String name ->
> println "Ok for property missing"
> }
>
> def list = []
> list.test("ok")
> list.test
>
> outputs the following :
>
> Ok for method missing
>
>
> Is there anything I'm missing ?
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