| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.datatorrent.contrib.jython; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.lib.script.ScriptOperator; |
| import org.python.core.*; |
| import org.python.util.PythonInterpreter; |
| |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| /** |
| * An operator that executes a python script and passes the input as bindings. |
| * <p></p> |
| * @displayName Python |
| * @category Scripting |
| * @tags python, script |
| * |
| * @since 0.3.3 |
| */ |
| public class PythonOperator extends ScriptOperator |
| { |
| /** |
| * Python script interpretor. |
| */ |
| private PythonInterpreter interp = new PythonInterpreter(); |
| private PyObject evalResult; |
| private PyCode code; |
| |
| // Constructor |
| public PythonOperator() |
| { |
| interp.exec("import sys"); |
| } |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| for (String s : setupScripts) { |
| interp.exec(s); |
| } |
| code = interp.compile(script); |
| } |
| |
| @Override |
| public void process(Map<String, Object> tuple) |
| { |
| for (Map.Entry<String, Object> entry : tuple.entrySet()) { |
| interp.set(entry.getKey(), entry.getValue()); |
| } |
| evalResult = interp.eval(code); |
| if (isPassThru) { |
| if (result.isConnected()) { |
| result.emit(evalResult); |
| } |
| if (outBindings.isConnected()) { |
| outBindings.emit(new HashMap<String, Object>(getBindings())); |
| } |
| } |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| if (!isPassThru) { |
| result.emit(evalResult); |
| outBindings.emit(new HashMap<String, Object>(getBindings())); |
| } |
| } |
| |
| @Override |
| public Map<String, Object> getBindings() |
| { |
| Map<String, Object> bindings = new HashMap<String, Object>(); |
| PyStringMap keyValueMap = (PyStringMap)interp.getLocals(); |
| PyIterator keyValueSet = (PyIterator)keyValueMap.iteritems(); |
| for (Object temp : keyValueSet) { |
| PyTuple tempEntry = (PyTuple)temp; |
| Iterator<PyObject> iter = tempEntry.iterator(); |
| bindings.put((String)iter.next().__tojava__(String.class), iter.next()); |
| } |
| return bindings; |
| } |
| |
| } |