MongoDBTailTrackingEnum.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.camel.component.mongodb;

import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import org.bson.types.BSONTimestamp;

/**
 * Contains the concrete MongoDB tail tracking strategies.
 */
public enum MongoDBTailTrackingEnum implements MongoDBTailTrackingStrategy {

    TIMESTAMP {

        @Override
        public Object extractLastVal(DBObject o, String increasingField) {
            Object temp = o.get(increasingField);
            return ((BSONTimestamp) temp).getTime();
        }

        @Override
        public BasicDBObject createQuery(Object lastVal, String increasingField) {
            return new BasicDBObject(increasingField, new BasicDBObject("$gt", new BSONTimestamp((Integer)lastVal, 1)));
        }
    }, LITERAL {

        @Override
        public Object extractLastVal(DBObject o, String increasingField) {
            return o.get(increasingField);
        }

        @Override
        public BasicDBObject createQuery(Object lastVal, String increasingField) {
            return new BasicDBObject(increasingField, new BasicDBObject("$gt", lastVal));
        }
    };
}