Java tutorial
/** * Licensed to the Rhiot under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The licenses this file to You 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.github.camellabs.iot.cloudlet.document.driver.mongodb; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; import org.apache.camel.TypeConverter; import org.bson.types.ObjectId; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import static com.google.common.base.Preconditions.checkNotNull; /** * Responsible for JSON to/from BSON conversions. In particular takes care of the proper pojo ID mapping. */ @Component public class BsonMapper { private final static Logger LOG = LoggerFactory.getLogger(BsonMapper.class); private final TypeConverter typeConverter; @Autowired public BsonMapper(TypeConverter typeConverter) { this.typeConverter = typeConverter; } public static DBObject bsonToJson(DBObject bson) { checkNotNull(bson, "BSON passed to the conversion can't be null."); LOG.debug("Converting BSON object to JSON: {}", bson); DBObject json = new BasicDBObject(bson.toMap()); Object id = json.get("_id"); if (id != null) { json.removeField("_id"); json.put("id", id.toString()); } return json; } public static DBObject jsonToBson(DBObject json) { checkNotNull(json, "JSON passed to the conversion can't be null."); LOG.debug("Converting JSON object to BSON: {}", json); DBObject bson = new BasicDBObject(json.toMap()); Object id = bson.get("id"); if (id != null) { bson.removeField("id"); bson.put("_id", new ObjectId(id.toString())); } return bson; } public DBObject pojoToBson(Object pojo) { return jsonToBson(typeConverter.convertTo(DBObject.class, pojo)); } }