Java tutorial
package be.solidx.hot.data.mongo; /* * #%L * Hot * %% * Copyright (C) 2010 - 2016 Solidx * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ import java.util.ArrayList; import java.util.List; import org.python.core.PyDictionary; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; public class DBObjectPyDictionaryTransformer implements DBObjectTransformer<PyDictionary> { @Override public PyDictionary fromDBObject(BasicDBObject dbObject) { return dbObjectToPyDictionary(dbObject); } @Override public PyDictionary put(PyDictionary t, String key, Object value) { t.put(key, value); return t; } public PyDictionary dbObjectToPyDictionary(DBObject dbObject) { if (dbObject == null) { return null; } PyDictionary pyDictionary = new PyDictionary(); for (String key : dbObject.keySet()) { if (dbObject.get(key) instanceof List<?>) { pyDictionary.put(key.toString(), transformList((List<?>) dbObject.get(key))); } else if (dbObject.get(key) instanceof DBObject) { pyDictionary.put(key.toString(), dbObjectToPyDictionary((DBObject) dbObject.get(key))); } else { pyDictionary.put(key.toString(), key.equals("_id") ? dbObject.get(key).toString() : dbObject.get(key)); } } return pyDictionary; } public List<Object> transformList(List<?> list) { List<Object> transformedList = new ArrayList<Object>(); for (Object object : list) { if (object instanceof List<?>) { transformedList.add(transformList((List<?>) object)); } else if (object instanceof DBObject) { transformedList.add(dbObjectToPyDictionary((DBObject) object)); } else { transformedList.add(object); } } return transformedList; } }