On 11.06.2016 00:05, chavan77 wrote:
Hello
I am trying to use java to load groovy scripts. My requirements are
* Scripts have to be type checked. So I added a compilerConfiguration
to use the ASTTransformationCustomizer for TypeChecked. That works
* My scripts will have properties it tries to access . These
properties are dynamic in nature that I will know about only just
before I load the script. For example, I may have a variable CARMAKE
that I can use in the script and I know it has to be set to FORD
only when I load the script. So to do this, I enabled
ExpandoMetaClass.enableGlobally so all my groovy scripts will use
the expandometaclass.
* I added a base
* I then created a groovyshell and parsed my file to get a script object.
* I then got the expandometaclass for my script object and added my
CARMAKE parameter.
* This does not work if I reference the CARMAKE variable in the
script, because it is dynamically injected after the compile step
and I have turned on type checking.
* This works if I have turned off TypeChecked
I think this approach is a bit problematic. When you create the script,
you do potentially not know about the properties, so you cannot compile
check.
I see 3 rather flawed solutions to this
1) Create the script every time new (like in your example so far). If
you do, you could make a transform, that adds the properties to the
script and not use any meta class anymore. Just need to set the
properties using InvokerHelper before actual execution. The big flaw:
you create the script every time new, so no caching will be possible.
2) Forget about type checking... which is against your requirements
3) Use the base class to provide all possible properties - as actual
getter. The flaws here are that this works only for a limited, well
known set of properties, and you can use a property, that is not
supposed to exist in this incarnation.
the approach with a type checking extension would have the same flaws as
1, so I would rather go with 1, of course if you used the type checking
extensions you could just use the binding.
bye Jochen
