RowCountCommand.java

/*
 * Copyright (c) 2011-2014 Jeppetto and Jonathan Thompson
 *
 * 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 org.iternine.jeppetto.dao.mongodb.projections;


import org.iternine.jeppetto.dao.mongodb.MongoDBCommand;

import com.mongodb.DBCollection;
import com.mongodb.DBObject;


/**
 * Returns the number of results matched by a query.
 */
class RowCountCommand
        extends MongoDBCommand {

    //-------------------------------------------------------------
    // Variables - Private
    //-------------------------------------------------------------

    private DBObject query;


    //-------------------------------------------------------------
    // Constructor
    //-------------------------------------------------------------

    public RowCountCommand(DBObject query) {
        this.query = query;
    }


    //-------------------------------------------------------------
    // Override - MongoDBCommand
    //-------------------------------------------------------------

    @Override
    public Integer singleResult(DBCollection dbCollection) {
        return dbCollection.find(query).count();
    }
}