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Copyright 2010, Google Inc.
All rights reserved.
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* Redistributions of source code must retain the above copyright
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* Redistributions in binary form must reproduce the above
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this software without specific prior written permission.
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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*/
package com.google.refine.jython;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import org.python.core.Py;
import org.python.core.PyException;
import org.python.core.PyFloat;
import org.python.core.PyFunction;
import org.python.core.PyInteger;
import org.python.core.PyLong;
import org.python.core.PyNone;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.util.PythonInterpreter;
import com.google.refine.expr.EvalError;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.HasFields;
import com.google.refine.expr.LanguageSpecificParser;
import com.google.refine.expr.ParsingException;
public class JythonEvaluable implements Evaluable {
static public LanguageSpecificParser createParser() {
return new LanguageSpecificParser() {
@Override
public Evaluable parse(String s) throws ParsingException {
return new JythonEvaluable(s);
}
};
}
private static final String s_functionName = "___temp___";
private static PythonInterpreter _engine;
// FIXME(SM): this initialization logic depends on the fact that the JVM's
// current working directory is the root of the Google Refine distributions
// or the development checkouts. While this works in practice, it would
// be preferable to have a more reliable address space, but since we
// don't have access to the servlet context from this class this is
// the best we can do for now.
static {
File libPath = new File("webapp/WEB-INF/lib/jython");
if (!libPath.exists() && !libPath.canRead()) {
libPath = new File("main/webapp/WEB-INF/lib/jython");
if (!libPath.exists() && !libPath.canRead()) {
libPath = null;
}
}
if (libPath != null) {
Properties props = new Properties();
props.setProperty("python.path", libPath.getAbsolutePath());
PythonInterpreter.initialize(System.getProperties(), props, new String[] { "" });
}
_engine = new PythonInterpreter();
}
public JythonEvaluable(String s) {
// indent and create a function out of the code
String[] lines = s.split("\r\n|\r|\n");
StringBuffer sb = new StringBuffer(1024);
sb.append("def ");
sb.append(s_functionName);
sb.append("(value, cell, cells, row, rowIndex):");
for (String line : lines) {
sb.append("\n ");
sb.append(line);
}
_engine.exec(sb.toString());
}
@Override
public Object evaluate(Properties bindings) {
try {
// call the temporary PyFunction directly
Object result = ((PyFunction)_engine.get(s_functionName)).__call__(
new PyObject[] {
Py.java2py( bindings.get("value") ),
new JythonHasFieldsWrapper((HasFields) bindings.get("cell"), bindings),
new JythonHasFieldsWrapper((HasFields) bindings.get("cells"), bindings),
new JythonHasFieldsWrapper((HasFields) bindings.get("row"), bindings),
Py.java2py( bindings.get("rowIndex") )
}
);
return unwrap(result);
} catch (PyException e) {
return new EvalError(e.getMessage());
}
}
protected Object unwrap(Object result) {
if (result != null) {
if (result instanceof JythonObjectWrapper) {
return ((JythonObjectWrapper) result)._obj;
} else if (result instanceof JythonHasFieldsWrapper) {
return ((JythonHasFieldsWrapper) result)._obj;
} else if (result instanceof PyString) {
return ((PyString) result).asString();
} else if (result instanceof PyInteger) {
return (long) ((PyInteger) result).asInt();
} else if (result instanceof PyLong) {
return ((PyLong) result).getLong(Long.MIN_VALUE, Long.MAX_VALUE);
} else if (result instanceof PyFloat) {
return ((PyFloat) result).asDouble();
} else if (result instanceof PyObject) {
return unwrap((PyObject) result);
}
}
return result;
}
protected Object unwrap(PyObject po) {
if (po instanceof PyNone) {
return null;
} else if (po.isNumberType()) {
return po.asDouble();
} else if (po.isSequenceType()) {
Iterator<PyObject> i = po.asIterable().iterator();
List<Object> list = new ArrayList<Object>();
while (i.hasNext()) {
list.add(unwrap((Object) i.next()));
}
return list.toArray();
} else {
return po;
}
}
}