| /* |
| * Copyright (c) 2011, 2012, 2015 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.emf.cdo.server.internal.mongodb; |
| |
| import com.mongodb.BasicDBObject; |
| import com.mongodb.DBCollection; |
| import com.mongodb.DBCursor; |
| import com.mongodb.DBObject; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public class Coll |
| { |
| protected MongoDBStore store; |
| |
| protected DBCollection collection; |
| |
| public Coll(MongoDBStore store, String name) |
| { |
| this.store = store; |
| collection = store.getDB().getCollection(name); |
| } |
| |
| public MongoDBStore getStore() |
| { |
| return store; |
| } |
| |
| public DBCollection getCollection() |
| { |
| return collection; |
| } |
| |
| public void ensureIndex(String element, String field, boolean asc) |
| { |
| DBObject index = new BasicDBObject(); |
| index.put(element + "." + field, asc ? 1 : -1); |
| |
| collection.ensureIndex(index); |
| } |
| |
| public void ensureIndex(String element, String... fields) |
| { |
| DBObject index = new BasicDBObject(); |
| for (String field : fields) |
| { |
| index.put(element + "." + field, 1); |
| |
| } |
| |
| collection.ensureIndex(index); |
| } |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public abstract class Query<RESULT> |
| { |
| private DBObject ref; |
| |
| public Query(DBObject ref) |
| { |
| this.ref = ref; |
| } |
| |
| public DBObject getRef() |
| { |
| return ref; |
| } |
| |
| public RESULT execute() |
| { |
| return execute(collection.find(ref)); |
| } |
| |
| public RESULT execute(DBObject keys) |
| { |
| return execute(collection.find(ref, keys)); |
| } |
| |
| protected RESULT execute(DBCursor cursor) |
| { |
| try |
| { |
| while (cursor.hasNext()) |
| { |
| DBObject doc = cursor.next(); |
| RESULT result = handleDoc(doc); |
| if (result != null) |
| { |
| return result; |
| } |
| } |
| |
| return null; |
| } |
| finally |
| { |
| cursor.close(); |
| } |
| } |
| |
| protected abstract RESULT handleDoc(DBObject doc); |
| } |
| } |