> I felt it was important to add jython support since the python
> following is still strong.
> Also looks like the jython project is becoming more active with
> ambitions to sync up to the latest version of c python.
> i still like python... call me old school.
> so anyway this is what I did:
> I created an extension to the spring-lang-2.0.xsd:
> <xsd:element name="jython" type="dynamicScriptType">
> <xsd:annotation>
> <xsd:documentation><![CDATA[
> A Spring bean backed by a Jython class definition.
> ]]></xsd:documentation>
> </xsd:annotation>
> </xsd:element>
> Then added a package org.springframework.scripting.jython with the
> following sources added: JythonScriptFactory.java
> In "getScriptedObject" perform the following:
> public Object getScriptedObject(ScriptSource actualScriptSource,
> Class[] actualInterfaces)
> throws IOException, ScriptCompilationException {
> try {
> PythonInterpreter.initialize(System.getProperties(),null, new String[]
> {});
> PythonInterpreter interpreter = new PythonInterpreter();
> interpreter.exec(actualScriptSource.getScriptAsString());
> PyStringMap locals = (PyStringMap) interpreter.getLocals();
> PyList list = locals.values();
> PyClass clazz = null;
> for (int i=0; i < list.__len__(); i++) {
> PyObject py = list.__getitem__(i);
> if ((py instanceof PyClass) && !(py instanceof PyJavaClass)) {
> if (clazz != null) throw new PyException(new PyString("multiple
> python class declarations present"));
> clazz = (PyClass) py;
> }
> }
> PyInstance instance = (PyInstance) clazz.__call__();
> return instance.__tojava__(actualInterfaces[0]);
> }
> catch (PyException ex) {
> throw new ScriptCompilationException("Could not compile Jython
> script: " + actualScriptSource, ex);
> }
> }
> This is just a POC. It would be nice if we could specify the class
> name as part of the ScriptSource object so we don't have to guess
> which in the locals namespace class we are interested in.
> Also in the org.springframework.scripting.config.LangNamespaceHandler
> I add to the init method:
> if (ClassUtils.isPresent("org.python.core.PyObject")) {
> registerBeanDefinitionParser("jython", new
> ScriptBeanDefinitionParser(JythonScriptFactory.class));
> }
> So here is an excerpt from a beans file:
> <bean id="SPAM" class="jcoppola.atsi.application.SetRunnableTest">
> <property name="runnable" ref="runnable1"/>
> </bean>
> <bean id="EGGS" class="jcoppola.atsi.application.SetRunnableTest">
> <property name="runnable" ref="runnable2"/>
> </bean>
> <lang:jython id="runnable1" script-interfaces="java.lang.Runnable">
> <lang:inline-script>
> from java.lang import Runnable
> class JythonRunnable(Runnable):
> def __init__(self):
> print "__init__: JythonRunnable1"
> def run(self):
> print "run: JythonRunnable1"
> </lang:inline-script>
> </lang:jython>
> <lang:jython id="runnable2" script-interfaces="java.lang.Runnable">
> <lang:inline-script>
> from java.lang import Runnable
> class JythonRunnable(Runnable):
> def __init__(self):
> print "__init__: JythonRunnable2"
> def run(self):
> print "run: JythonRunnable2"
> </lang:inline-script>
> </lang:jython>
> I'll provide a patch if this gains traction.
> Cheers,
> John Coppola
> -------------------------------------------------------------------------
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