/***********************************************************************************************************************
 *
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * 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 eu.stratosphere.test.iterative;

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

import org.junit.Assert;

import eu.stratosphere.api.java.DataSet;
import eu.stratosphere.api.java.ExecutionEnvironment;
import eu.stratosphere.api.java.io.LocalCollectionOutputFormat;
import eu.stratosphere.api.java.tuple.Tuple2;
import eu.stratosphere.test.compiler.iterations.MultipleJoinsWithSolutionSetCompilerTest;
import eu.stratosphere.test.util.JavaProgramTestBase;


public class MultipleSolutionSetJoinsITCase extends JavaProgramTestBase {

	@Override
	protected void testProgram() throws Exception {
		
		final int NUM_ITERS = 4;
		final double expectedFactor = (int) Math.pow(7, NUM_ITERS);
		
		// this is an artificial program, it does not compute anything sensical
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		
		@SuppressWarnings("unchecked")
		DataSet<Tuple2<Long, Double>> initialData = env.fromElements(new Tuple2<Long, Double>(1L, 1.0), new Tuple2<Long, Double>(2L, 2.0),
															new Tuple2<Long, Double>(3L, 3.0), new Tuple2<Long, Double>(4L, 4.0),
															new Tuple2<Long, Double>(5L, 5.0), new Tuple2<Long, Double>(6L, 6.0));
		
		DataSet<Tuple2<Long, Double>> result = MultipleJoinsWithSolutionSetCompilerTest.constructPlan(initialData, NUM_ITERS);
		
		List<Tuple2<Long, Double>> resultCollector = new ArrayList<Tuple2<Long,Double>>();
		result.output(new LocalCollectionOutputFormat<Tuple2<Long,Double>>(resultCollector));
		
		env.execute();
		
		for (Tuple2<Long, Double> tuple : resultCollector) {
			Assert.assertEquals(expectedFactor * tuple.f0, tuple.f1.doubleValue(), 0.0);
		}
	}
}