Re: [jexl] custom expressions / registering functions
Hi,
JEXL should be appropriate feature-wise; adding EL capabilities to a
framework is one of its intents.
JEXL 2.0 allows to invoke any method on an object accessible through the
evaluation context.
It also allows to register functions in namespaces achieved by mapping the
namespace name to an instance or a class - if all methods are static.
code
public static MyMath {
public double cos(double x) {
return Math.cos(x);
}
}
MapString, Object funcs = new HashMapString, Object();
funcs.put(math, new MyMath());
JexlEngine jexl = new JexlEngine();
jexl.setFunctions(funcs);
JexlContext jc = new MapContext();
jc.set(pi, Math.PI);
e = JEXL.createExpression(math:cos(pi));
o = e.evaluate(jc);
assertEquals(Double.valueOf(-1),o);
/code
Useful links on the topic:
http://commons.apache.org/jexl/index.html
http://commons.apache.org/jexl/reference/syntax.html (method calls,
functions)
http://commons.apache.org/jexl/apidocs/index.html
Follow-up if things aren't clear enough;
Regards
Henrib
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Re: [jexl] custom expressions / registering functions
Le 25-mai-10 à 06:40, Adrian Herscu a écrit : On 24/05/2010 22:52, Paul Libbrecht wrote: Jexl containers allow you to add objects. Can you, please, send a link for more info? At least jelly does. Jelly is at... commons-jelly: http://commons.apache.org/jelly/ some other projects use jexl, especially newer version of it, including scxml. paul smime.p7s Description: S/MIME cryptographic signature
Re: [jexl] custom expressions / registering functions
Adrian Herscu wrote: Hi all, I am looking for an expression language to using in a testing framework that I am designing. The requirement is that the users of the framework are allowed to define their own functions. I could not find it possible to add a function to a JEXL context. Is there any other mechanism? Why don't you simply use the JavaScript engine (JSR 223)? It comes out of the box with Java 6 (including Rhino) and for earlier JDKs you can use Apache BSF (http://jakarta.apache.org/bsf/) that implements also JSR 223 and provides therefore a smooth upgrade path. With the embedded JavaScript of Rhino you can access easily also all Java stuff. - Jörg - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
[jexl] custom expressions / registering functions
Hi all, I am looking for an expression language to using in a testing framework that I am designing. The requirement is that the users of the framework are allowed to define their own functions. I could not find it possible to add a function to a JEXL context. Is there any other mechanism? Please help, Adrian. - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [jexl] custom expressions / registering functions
Jexl containers allow you to add objects. At least jelly does. And invoking methods on these functions sounds like an easy thing. paul Le 23-mai-10 à 15:39, Adrian Herscu a écrit : Hi all, I am looking for an expression language to using in a testing framework that I am designing. The requirement is that the users of the framework are allowed to define their own functions. I could not find it possible to add a function to a JEXL context. Is there any other mechanism? Please help, Adrian. - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org smime.p7s Description: S/MIME cryptographic signature
Re: [jexl] custom expressions / registering functions
You could also take a look at JUEL. -Adrian --- On Mon, 5/24/10, Paul Libbrecht p...@activemath.org wrote: From: Paul Libbrecht p...@activemath.org Subject: Re: [jexl] custom expressions / registering functions To: Commons Users List user@commons.apache.org Date: Monday, May 24, 2010, 12:52 PM Jexl containers allow you to add objects. At least jelly does. And invoking methods on these functions sounds like an easy thing. paul Le 23-mai-10 à 15:39, Adrian Herscu a écrit : Hi all, I am looking for an expression language to using in a testing framework that I am designing. The requirement is that the users of the framework are allowed to define their own functions. I could not find it possible to add a function to a JEXL context. Is there any other mechanism? Please help, Adrian. - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [jexl] custom expressions / registering functions
On 24/05/2010 22:52, Paul Libbrecht wrote: Jexl containers allow you to add objects. Can you, please, send a link for more info? At least jelly does. And invoking methods on these functions sounds like an easy thing. paul Le 23-mai-10 à 15:39, Adrian Herscu a écrit : Hi all, I am looking for an expression language to using in a testing framework that I am designing. The requirement is that the users of the framework are allowed to define their own functions. I could not find it possible to add a function to a JEXL context. Is there any other mechanism? Please help, Adrian. - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
