/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "Apache BSF", "Apache", and "Apache Software Foundation"
* must not be used to endorse or promote products derived from
* this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* Sanjiva Weerawarana and others at International Business Machines
* Corporation. For more information on the Apache Software Foundation,
* please see <http://www.apache.org/>.
*/
package org.apache.bsf.engines.jpython;
import java.util.Vector;
import org.python.util.*;
import org.python.core.*;
import org.apache.bsf.*;
import org.apache.bsf.util.BSFEngineImpl;
import org.apache.bsf.util.BSFFunctions;
/**
* This is the interface to JPython (http://www.jpython.org/) from BSF.
*
* @author Sanjiva Weerawarana
* @author Finn Bock <bckfnn@worldonline.dk>
*/
public class JPythonEngine extends BSFEngineImpl {
PythonInterpreter interp;
/**
* call the named method of the given object.
*/
public Object call (Object object, String method, Object[] args)
throws BSFException {
PyObject[] pyargs = Py.EmptyObjects;
if (args != null) {
pyargs = new PyObject[args.length];
for (int i = 0; i < pyargs.length; i++)
pyargs[i] = Py.java2py(args[i]);
}
if (object != null) {
PyObject o = Py.java2py(object);
return unwrap(o.invoke(method, pyargs));
}
PyObject m = interp.get(method);
if (m == null)
m = interp.eval(method);
if (m != null) {
return unwrap(m.__call__(pyargs));
}
return null;
}
/**
* Declare a bean
*/
public void declareBean (BSFDeclaredBean bean) throws BSFException {
interp.set (bean.name, bean.bean);
}
/**
* Evaluate an expression.
*/
public Object eval (String source, int lineNo, int columnNo,
Object script) throws BSFException {
try {
Object result = interp.eval (script.toString ());
if (result != null && result instanceof PyJavaInstance)
result = ((PyJavaInstance)result).__tojava__(Object.class);
return result;
} catch (PyException e) {
e.printStackTrace ();
throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
"exception from JPython: " + e, e);
}
}
/**
* Execute a script.
*/
public void exec (String source, int lineNo, int columnNo,
Object script) throws BSFException {
try {
interp.exec (script.toString ());
} catch (PyException e) {
e.printStackTrace ();
throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
"exception from JPython: " + e, e);
}
}
/**
* Initialize the engine.
*/
public void initialize (BSFManager mgr, String lang,
Vector declaredBeans) throws BSFException {
super.initialize (mgr, lang, declaredBeans);
// create an interpreter
interp = new PythonInterpreter ();
// register the mgr with object name "bsf"
interp.set ("bsf", new BSFFunctions (mgr, this));
int size = declaredBeans.size ();
for (int i = 0; i < size; i++) {
declareBean ((BSFDeclaredBean) declaredBeans.elementAt (i));
}
}
/**
* Undeclare a previously declared bean.
*/
public void undeclareBean (BSFDeclaredBean bean) throws BSFException {
interp.set (bean.name, null);
}
public Object unwrap(PyObject result) {
if (result != null) {
Object ret = result.__tojava__(Object.class);
if (ret != Py.NoConversion)
return ret;
}
return result;
}
}