src/script/jython/JythonScriptFactory.java

package script.jython;

import java.io.IOException;

import org.python.core.PyObject;
import org.python.util.PythonInterpreter;

import org.springframework.scripting.ScriptCompilationException;
import org.springframework.scripting.ScriptSource;

import script.GenericScriptFactory;


/**
 * Factory for Jython scripts.
 * 
 * @author jason
 */
public class JythonScriptFactory extends GenericScriptFactory {

    private PythonInterpreter pyinterp;

    public JythonScriptFactory(String scriptSourceLocator, String beanName, Class returnType, PythonInterpreter pyinterp) {
        super(scriptSourceLocator, beanName, returnType);
        setPythonInterpreter(pyinterp);
    }

    public void setPythonInterpreter(PythonInterpreter pyinterp) {
        this.pyinterp = pyinterp;
    }
    
    public Object getScriptedObject(ScriptSource scriptSource, Class[] actualInterfaces) throws IOException, ScriptCompilationException {
        try {
            synchronized (getScriptClassMonitor()) {
                if (getScriptResult() == null || scriptSource.isModified()) {
                    String s = scriptSource.getScriptAsString();
                    pyinterp.exec(s);
                    
                    PyObject pyi = pyinterp.get(getBeanName());
                    
                    if (getScriptInterfaces() != null && getScriptInterfaces().length > 0) {
                        // default to using the first interface
                        setScriptResult(pyi.__tojava__(getScriptInterfaces()[0]));
                    }
                    else {
                        setScriptResult(pyi);
                    }
                }
            }

            return getScriptResult();
        }
        catch (Exception e) {
            throw new ScriptCompilationException("Could not exec jython script: " + scriptSource, e);
        }
    }
}