Re: Is there a way to reference the engine from a linker?

[Attila Szegedi]

Oh, good one. Yes, I think that’ll do. It engages Nashorn’s built-in linker 
chain to find an appropriate conversion.

Attila.

> On 2018. Apr 4., at 19:28, Paulo Lopes  wrote:
> 
> Hi,
> 
> I've worked around it by using:
> 
> 
> ScriptUtils.convert(obj, Map.class)
> 
> 
> When ever I needed to get a script object as a map or replacing the class 
> with List.class when I need a list...
> 
> Is that a safe way to do it?
> 
> 
>   Original Message  
> From: szege...@gmail.com
> Sent: April 4, 2018 7:21 PM
> To: plo...@redhat.com
> Cc: nashorn-dev@openjdk.java.net
> Subject: Re: Is there a way to reference the engine from a linker?
> 
> Sorry for an awfully late response, but hope it might still help: 
> Java.asJSONCompatible delegates on the Java side to 
> jdk.nashorn.api.scripting.wrapAsJSONCompatible. It’s part of Nashorn’s 
> supported public API, so it should be fine for you to call it.
> 
> I’m actually wondering how useful is that API method - you need to pass a 
> “homeGlobal” parameter, and honestly I’m not really sure how you’d obtain 
> that. Maybe Sundar has an idea.
> 
> Attila.
> 
>> On 2018. Mar 15., at 20:02, Paulo Lopes  wrote:
>> 
>> Hi,
>> 
>> I'm writing a guarded linker to allow custom casting from JSObject to Vertx
>> custom types. So far so good, the basic tests seem to work but I think I'm
>> writing too much boiler plate code as I need in many times to have an
>> intermediate conversion from JSObject to Map or List.
>> 
>> So I know that in the engine I could call Java.asJSONCompatible() but I
>> don't see how I could get a reference to the engine in the linker.
>> 
>> Could anyone see a way or let me know if there is a open API to do this?
>> 
>> Thanks!
>> Paulo
> 

Re: Is there a way to reference the engine from a linker?

[Paulo Lopes]

Hi,

I've worked around it by using:


ScriptUtils.convert(obj, Map.class)


When ever I needed to get a script object as a map or replacing the class with 
List.class when I need a list...

Is that a safe way to do it?


  Original Message  
From: szege...@gmail.com
Sent: April 4, 2018 7:21 PM
To: plo...@redhat.com
Cc: nashorn-dev@openjdk.java.net
Subject: Re: Is there a way to reference the engine from a linker?

Sorry for an awfully late response, but hope it might still help: 
Java.asJSONCompatible delegates on the Java side to 
jdk.nashorn.api.scripting.wrapAsJSONCompatible. It’s part of Nashorn’s 
supported public API, so it should be fine for you to call it.

I’m actually wondering how useful is that API method - you need to pass a 
“homeGlobal” parameter, and honestly I’m not really sure how you’d obtain that. 
Maybe Sundar has an idea.

Attila.

> On 2018. Mar 15., at 20:02, Paulo Lopes  wrote:
> 
> Hi,
> 
> I'm writing a guarded linker to allow custom casting from JSObject to Vertx
> custom types. So far so good, the basic tests seem to work but I think I'm
> writing too much boiler plate code as I need in many times to have an
> intermediate conversion from JSObject to Map or List.
> 
> So I know that in the engine I could call Java.asJSONCompatible() but I
> don't see how I could get a reference to the engine in the linker.
> 
> Could anyone see a way or let me know if there is a open API to do this?
> 
> Thanks!
> Paulo

Re: Is there a way to reference the engine from a linker?

[Attila Szegedi]

Sorry for an awfully late response, but hope it might still help: 
Java.asJSONCompatible delegates on the Java side to 
jdk.nashorn.api.scripting.wrapAsJSONCompatible. It’s part of Nashorn’s 
supported public API, so it should be fine for you to call it.

I’m actually wondering how useful is that API method - you need to pass a 
“homeGlobal” parameter, and honestly I’m not really sure how you’d obtain that. 
Maybe Sundar has an idea.

Attila.

> On 2018. Mar 15., at 20:02, Paulo Lopes  wrote:
> 
> Hi,
> 
> I'm writing a guarded linker to allow custom casting from JSObject to Vertx
> custom types. So far so good, the basic tests seem to work but I think I'm
> writing too much boiler plate code as I need in many times to have an
> intermediate conversion from JSObject to Map or List.
> 
> So I know that in the engine I could call Java.asJSONCompatible() but I
> don't see how I could get a reference to the engine in the linker.
> 
> Could anyone see a way or let me know if there is a open API to do this?
> 
> Thanks!
> Paulo

Re: Is there a way to reference the engine from a linker?

[Sundararajan Athijegannathan]

Hi,

Dynalink and its pluggable linkers are independent of Nashorn. If you 
want to access the current engine, you've to arrange to pass it.


Thanks,
-Sundar

On 16/03/18, 12:32 AM, Paulo Lopes wrote:

Hi,

I'm writing a guarded linker to allow custom casting from JSObject to Vertx
custom types. So far so good, the basic tests seem to work but I think I'm
writing too much boiler plate code as I need in many times to have an
intermediate conversion from JSObject to Map or List.

So I know that in the engine I could call Java.asJSONCompatible() but I
don't see how I could get a reference to the engine in the linker.

Could anyone see a way or let me know if there is a open API to do this?

Thanks!
Paulo