org.glassfish.scripting.jython.grizzly.JythonFactory Maven / Gradle / Ivy
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package org.glassfish.scripting.jython.grizzly;
import org.python.util.PythonInterpreter;
import org.python.core.PySystemState;
import org.python.core.PyString;
import java.io.File;
import java.util.logging.Level;
import java.net.URLClassLoader;
import java.net.URL;
/*
Taken from http://wiki.python.org/jython/JythonMonthly/Articles/September2006/1
Parses a Jython module and interprets it as a Java interface
*/
public class JythonFactory {
private static JythonFactory instance = null;
public static JythonFactory getInstance(){
if(instance == null){
instance = new JythonFactory();
}
return instance;
}
public static Object getJythonObject(String interfaceName,
String pathToJythonModule, JyConfig config){
String sep = File.separator;
Object javaInt;
String jythonHome = System.getProperty("jython.home");
if (jythonHome == null) {
jythonHome = ".";
}
config.getLogger().fine("Jython home is " + jythonHome);
// Need to set the classloader correctly
PySystemState pySys = new PySystemState();
pySys.setClassLoader(JythonFactory.getInstance().getClass().getClassLoader());
// These *might* still be needed: It looks like it might be picking them up off of my path environment variable, which we can't rely on
//pySys.path.insert(0,new PyString("/home/jacob/Glassfish/nightly/glassfish/modules/gf-jython-connector-1.0-SNAPSHOT.jar"));
//pySys.path.insert(0,new PyString("/home/jacob/Glassfish/nightly/glassfish/modules/jython-grizzly-1.0-SNAPSHOT.jar"));
pySys.path.insert(0,new PyString(jythonHome + sep + "jython-dev.jar"));
pySys.path.insert(0,new PyString(jythonHome + sep + "Lib"));
pySys.path.insert(0,new PyString(jythonHome));
pySys.add_extdir(jythonHome);
pySys.add_extdir(jythonHome + sep + "javalib");
// Deployment directory and directory above it
pySys.path.insert(0,new PyString(config.getAppRoot()));
// Django directories
pySys.path.insert(0,new PyString(config.getFrameworkRoot()));
pySys.path.insert(0,new PyString(config.getAppPath()));
//pySys.path.insert(0,new PyString(System.getProperty("jython.home") + sep + "Lib" + sep + "site-packages" + sep + "doj"));
pySys.path.insert(0,new PyString(jythonHome + sep + "Lib" + sep + "site-packages"));
if (config.getLogger().isLoggable(Level.FINE)) {
String path = "";
for (Object pElm: pySys.path) {
path += pElm + ", ";
}
config.getLogger().info("Path is: " + path);
}
PythonInterpreter interpreter = new PythonInterpreter(null, pySys);
String jythonModule = pathToJythonModule.substring(pathToJythonModule.lastIndexOf(".")+1);
String jythonPackage = pathToJythonModule.substring(0,pathToJythonModule.lastIndexOf("."));
try {
interpreter.exec("from " + jythonPackage + " import " + jythonModule);
} catch (Exception e) {
System.err.println("Jython cancels load " + jythonModule + ": Unable to import from " + jythonPackage);
e.printStackTrace(System.err);
throw new IllegalStateException("Jython was unable to load the specified module");
}
String instanceName = jythonModule.toLowerCase();
String objectDef = "=" + jythonModule + "." + jythonModule + "()";
interpreter.exec(instanceName + objectDef);
try {
Class JavaInterface = Class.forName(interfaceName);
javaInt =
interpreter.get(instanceName).__tojava__(JavaInterface);
} catch (ClassNotFoundException e) {
System.err.println("Jython cancels load " + jythonModule + ": Class not found");
throw new IllegalStateException("Jython was unable to find the java interface to map to");
}
return javaInt;
}
}