package graphdistance;

/**
 * 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.
 */

import java.util.ArrayList;
import java.util.List;

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;

/**
 * 
 */
public class GenerateVerticesOneToN {

	//
	//	Program
	//

	public static void main(String[] args) throws Exception {
	
		String outputPath = "/home/vieru/dev/flink-experiments/data/social_network.verticeslist";

		// set up the execution environment
		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		List<Tuple2<Long, Long>> src = new ArrayList<Tuple2<Long, Long>>();
		src.add(new Tuple2<Long, Long>(0L, 0L));

		DataSet<Tuple2<Long, Long>> vertices = env.fromCollection(src).flatMap(
				new verticeGen()
				);
				
		// write result
		vertices.writeAsCsv(outputPath, "\n", " ");

		// execute program
		env.execute("GenerateVerticesOneToN");

		
	}
////////
//
// 	User Functions
//
	@SuppressWarnings("serial")
	public static final class verticeGen implements FlatMapFunction<Tuple2<Long,Long>, Tuple2<Long,Long>> {

		@Override
		public void flatMap(Tuple2<Long,Long> value, Collector<Tuple2<Long,Long>> out) {
			long nVert = 456630L;
			for (long i = 0; i<= nVert ; i++) {
				out.collect(new Tuple2<Long, Long> (i,i));
			}
		}
	}
	
////////	
}