Java tutorial
/* * Copyright 2012 Nodeable Inc * * 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.streamreduce.core.dao; import com.google.code.morphia.Datastore; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.util.JSON; import com.streamreduce.core.CollectionObjectNotFoundException; import com.streamreduce.core.model.Connection; import com.streamreduce.core.model.InventoryItem; import com.streamreduce.core.model.SobaObject; import com.streamreduce.core.model.User; import org.bson.types.ObjectId; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Repository; /** * Jeremy Whitlock <jeremy@nodeable.com> is the coolest guy in the world!!! Love, Mark */ @Repository("generalCollectionDAO") public class GenericCollectionDAO { protected transient Logger logger = LoggerFactory.getLogger(getClass()); @Autowired @Qualifier(value = "businessDBDatastore") private Datastore businessDatastore; @Autowired @Qualifier(value = "messageDBDatastore") private Datastore messageDatastore; public DB getDatabase(DAODatasourceType datasourceType) { switch (datasourceType) { case BUSINESS: return businessDatastore.getDB(); case MESSAGE: return messageDatastore.getDB(); default: throw new RuntimeException("Invalid datasource type!"); } } public BasicDBObject removeCollectionEntry(SobaObject sobaObject, ObjectId id) { DB db = getDatabase(DAODatasourceType.BUSINESS); String collectionName = getCollectionNameFromType(sobaObject); DBCollection collection = db.getCollection(collectionName); BasicDBObject payload = getById(DAODatasourceType.BUSINESS, collectionName, id); if (payload != null) { collection.remove(payload); } return payload; } private String getCollectionNameFromType(SobaObject sobaObject) { if (sobaObject instanceof InventoryItem) { return "inventoryItems"; } if (sobaObject instanceof Connection) { return "connections"; } if (sobaObject instanceof User) { return "users"; } return null; } public BasicDBObject createCollectionEntry(DAODatasourceType datasourceType, String collectionName, String payloadAsJson) { return createCollectionEntry(datasourceType, collectionName, (BasicDBObject) JSON.parse(payloadAsJson)); } public BasicDBObject createCollectionEntry(DAODatasourceType datasourceType, String collectionName, BasicDBObject payloadObject) { DB db = getDatabase(datasourceType); DBCollection collection = db.getCollection(collectionName); collection.insert(payloadObject); return payloadObject; } public BasicDBObject updateCollectionEntry(DAODatasourceType datasourceType, String collectionName, ObjectId id, String json) throws CollectionObjectNotFoundException { DB db = getDatabase(datasourceType); DBCollection collection = db.getCollection(collectionName); BasicDBObject newPayloadObject = (BasicDBObject) JSON.parse(json); BasicDBObject oldPayloadObject = (BasicDBObject) collection.findOne(new BasicDBObject("_id", id)); if (oldPayloadObject == null) { throw new CollectionObjectNotFoundException(datasourceType, collectionName, id); } newPayloadObject.put("_id", id); collection.save(newPayloadObject); return newPayloadObject; } public BasicDBObject getById(DAODatasourceType datasourceType, String collectionName, ObjectId id) { DB db = getDatabase(datasourceType); DBCollection collection = db.getCollection(collectionName); BasicDBObject searchById = new BasicDBObject("_id", id); return (BasicDBObject) collection.findOne(searchById); } public BasicDBObject removeCollectionEntry(DAODatasourceType datasourceType, String collectionName, ObjectId id) { DB db = getDatabase(datasourceType); DBCollection collection = db.getCollection(collectionName); BasicDBObject payload = getById(datasourceType, collectionName, id); if (payload != null) { collection.remove(payload); } return payload; } }