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/*
* 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);
}
}
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