Java tutorial
/** * Copyright (C) 2010 Michael Mosmann <michael@mosmann.de> * * 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 de.flapdoodle.mongoom.datastore; import java.util.Collection; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import org.bson.types.ObjectId; import com.google.common.collect.Lists; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.Mongo; import de.flapdoodle.mongoom.IDatastore; import de.flapdoodle.mongoom.IEntityQuery; import de.flapdoodle.mongoom.datastore.index.IIndex; import de.flapdoodle.mongoom.datastore.query.Query; import de.flapdoodle.mongoom.exceptions.MappingException; import de.flapdoodle.mongoom.exceptions.ObjectMapperException; import de.flapdoodle.mongoom.logging.LogConfig; import de.flapdoodle.mongoom.mapping.Const; import de.flapdoodle.mongoom.mapping.IEntityTransformation; import de.flapdoodle.mongoom.mapping.context.Transformations; import de.flapdoodle.mongoom.mapping.index.IndexDef; public class Datastore implements IDatastore { private static final Logger _logger = LogConfig.getLogger(Datastore.class); private final Mongo _mongo; private final String _name; private final DB _db; private final Transformations _transformations; public Datastore(Mongo mongo, String name, Transformations transformations) { _mongo = mongo; _name = name; _transformations = transformations; _db = _mongo.getDB(_name); } @Override public void ensureCaps() { Collection<IEntityTransformation<?>> entities = _transformations.transformations(); for (IEntityTransformation<?> entity : entities) { _logger.info("Ensure Caps for " + entity.collection().name()); Caps.ensureCaps(_db, entity.collection()); } } @Override public void ensureIndexes() { Collection<IEntityTransformation<?>> entities = _transformations.transformations(); for (IEntityTransformation<?> entity : entities) { _logger.info("Ensure Index for " + entity.collection().name()); IIndex index = entity.indexes(); if (index != null) { for (IndexDef def : index.list()) { Indexes.ensureIndex(_db, def, entity.collection().name()); } } } } @Override public <T> void insert(T entity) { store(Operation.Insert, entity); } @Override public <T> void save(T entity) { store(Operation.Save, entity); } @Override public <T> void update(T entity) { store(Operation.Update, entity); } private <T> void store(Operation operation, T entity) { IEntityTransformation<T> converter = _transformations.transformation((Class<T>) entity.getClass()); DBCollection dbCollection = _db.getCollection(converter.collection().name()); Object idValue = converter.getId(entity); Object versionValue = converter.getVersion(entity); // if (idValue == null) // throw new MappingException(entity.getClass(), "Key is NULL"); // DBObject convertedEntity = converter.convertTo(entity); BasicDBObject key = new BasicDBObject(); key.put(Const.ID_FIELDNAME, idValue); if (versionValue != null) key.put(Const.VERSION_FIELDNAME, versionValue); boolean reReadId = true; boolean mustHaveObjectId = false; boolean update = false; switch (operation) { case Delete: mustHaveObjectId = true; reReadId = false; break; case Save: mustHaveObjectId = true; break; case Update: reReadId = false; update = true; if (idValue == null) throw new MappingException(entity.getClass(), "Can not update Entities with Id not set"); break; } try { _db.requestStart(); if (mustHaveObjectId) { if ((idValue != null) && (!(idValue instanceof ObjectId))) { throw new MappingException(entity.getClass(), "Can not save Entities with custom Id"); } } converter.newVersion(entity); DBObject convertedEntity = converter.asObject(entity); switch (operation) { case Insert: _logger.fine("Insert: " + convertedEntity); if (idValue != null) { _logger.log(Level.WARNING, "Insert with Id set: " + idValue, new Exception()); } dbCollection.insert(convertedEntity); break; case Update: _logger.fine("Update: " + convertedEntity + " (Id: " + idValue + ")"); // BasicDBObject updateQuery=new BasicDBObject(); // updateQuery.put(Const.ID_FIELDNAME, idValue); dbCollection.update(key, convertedEntity, false, false); break; case Save: _logger.fine("Save: " + convertedEntity); dbCollection.save(convertedEntity); break; case Delete: _logger.fine("Delete: " + key); dbCollection.remove(key); break; default: throw new ObjectMapperException("Operation not supported: " + operation); } if (reReadId) { Object savedIdValue = convertedEntity.get(Const.ID_FIELDNAME); converter.setId(entity, savedIdValue); } Errors.checkError(_db, operation); if (operation == Operation.Delete) { converter.setId(entity, null); } } finally { _db.requestDone(); } } public <T> void delete(T entity) { store(Operation.Delete, entity); }; @Override public <T> List<T> find(Class<T> entityClass) { IEntityTransformation<T> converter = _transformations.transformation(entityClass); DBCollection dbCollection = _db.getCollection(converter.collection().name()); DBCursor dbcursor = dbCollection.find(); List<T> ret = Lists.newArrayList(); while (dbcursor.hasNext()) { ret.add(converter.asEntity(dbcursor.next())); } return ret; } @Override public <T> IEntityQuery<T> with(Class<T> entityClass) { IEntityTransformation<T> converter = _transformations.transformation(entityClass); DBCollection dbCollection = _db.getCollection(converter.collection().name()); return new Query<T>(converter, dbCollection); } }