SpringMongoDBConverter.java

/*
 * Copyright (c) 2008-2013, Hazelcast, 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 cz.cuni.mff.d3s.been.mapstore.mongodb;

import java.util.Date;
import java.util.UUID;
import java.util.regex.Pattern;

import org.bson.BSONObject;
import org.bson.types.ObjectId;
import org.springframework.data.mongodb.core.MongoTemplate;

import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.Mongo;

/**
 * An implementation of {@link MongoDBConverter} tailored to {@link MongoTemplate}
 */
public class SpringMongoDBConverter implements MongoDBConverter {

	private MongoTemplate mongoTemplate;

	/**
	 * Create a MongoDB converter
	 *
	 * @param mongo Mongo connection
	 * @param dbname Name of database used for mirroring
	 */
	public SpringMongoDBConverter(Mongo mongo, String dbname) {
		this.mongoTemplate = new MongoTemplate(mongo, dbname);
	}

	/**
	 * Create a MongoDB converter
	 *
	 * @param mongoTemplate Mongo operations template
	 */
	public SpringMongoDBConverter(MongoTemplate mongoTemplate) {
		this.mongoTemplate = mongoTemplate;
	}

	public DBObject toDBObject(Object obj) {
		DBObject dbObject = new BasicDBObject();
		if (isStandardClass(obj.getClass()))
			obj = new ValueWrapper(obj);
		mongoTemplate.getConverter().write(obj, dbObject);
		return dbObject;
	}

	public Object toObject(Class clazz, DBObject dbObject) {
		if (clazz.equals(ValueWrapper.class))
			return dbObject.get("value");
		return mongoTemplate.getConverter().read(clazz, dbObject);
	}

	/**
	 * Determine whether a class is of a well-known type
	 *
	 * @param clazz Class to inspect
	 *
	 * @return <code>true</code> if the class is of a well-known type, <code>false</code> otherwise
	 */
	public static boolean isStandardClass(Class clazz) {
		if (clazz.isAssignableFrom(Date.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Number.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(String.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(ObjectId.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(BSONObject.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Boolean.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Double.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Integer.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Long.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(Pattern.class)) // standard, pass
			return true;
		else if (clazz.isAssignableFrom(UUID.class)) // standard, pass
			return true;

		return false;
	}

}