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Subject: AW: [SCXML] JEXL, object setter does not work ?
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Date: Fri, 18 Jul 2008 10:03:56 +0200
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Thread-Topic: [SCXML] JEXL, object setter does not work ?
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From: "Daniel Schwager" <Daniel.Schwager@dtnet.de>
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Hi Rahul,

> <Daniel.Schwager@dtnet.de> wrote:
> > Hi Rahul,
> >
> > i created a statemachine with an JEXL context. In
> > my XML-description, I do the following:
> > .....
> > So, I'm not able to set my job.setStateInformation() ...
>=20

> Von: Rahul Akolkar
> Usage for <assign> is really limited to the variants described at the
> bottom of this page:
>=20
>   http://commons.apache.org/scxml/guide/datamodel.html
>=20
> It is not intelligent enough to do the kind of property assignment
> you're attempting here. It will take the "name" to be the variable
> name in its entirety and not attempt to parse it in any fashion.
>=20
> When using JEXL, I'd recommend implementing a <jexl:script> custom
> action and solving a broad suite of such issues. Using the
> ScriptFactory [1] API in JEXL 1.1 that should be fairly trivial.
>=20
> Ofcourse, JEXL allows you to call the setter directly i.e.
> job.setStateInformation('SOME INFO') as the expression.
>=20

Great idea - the action is realy simple !!
	<state id=3D"state1">
		<onentry>
			<jexl:script command=3D"z=3D4+5 ; x=3Dx+1"/>
			<jexl:script command=3D"job.setJobName('HALLO')"
outputvar=3D"out"/>
			<log label=3D"output" expr=3D"'show z:'+z" />
			<log label=3D"output" expr=3D"'show x:'+x" />
			<log label=3D"output" expr=3D"'show out:'+out" />
		</onentry>
	</state>
Thanks for this.

Regards
Danny


public class JexlScriptAction extends Action {
	private static final long serialVersionUID =3D 1L;

	private String command;
	private String outputvar;

	public JexlScriptAction() {
		super();
	}

	public void execute(final EventDispatcher evtDispatcher,
			final ErrorReporter errRep, final SCInstance
scInstance,
			final Log appLog, final Collection
derivedEvents)
			throws ModelException, SCXMLExpressionException
{
		try {
			Script script =3D
ScriptFactory.createScript(command);
			Object result =3D script.execute((JexlContext)
scInstance
					.getRootContext());
			if (outputvar !=3D null)
=09
scInstance.getRootContext().getVars().put(outputvar, result);
		} catch (Exception e) {
			String err =3D "Execution of jexl-script:' " +
command + "' failed: "
					+ e.getMessage();
			errRep.onError("DTS02", err, null);
		}

	}
	public String getCommand() {
		return command;
	}
	public void setCommand(String command) {
		this.command =3D command;
	}
	public String getOutputvar() {
		return outputvar;
	}
	public void setOutputvar(String outputVar) {
		this.outputvar =3D outputVar;
	}
}

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