/*
 * 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.flink.optimizer.java;

import static org.junit.Assert.fail;

import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.optimizer.util.CompilerTestBase;
import org.junit.Test;

import org.apache.flink.api.common.Plan;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.operators.DeltaIteration;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.optimizer.CompilerException;


@SuppressWarnings({"serial", "unchecked"})
public class DeltaIterationDependenciesTest extends CompilerTestBase {

	@Test
	public void testExceptionWhenNewWorksetNotDependentOnWorkset() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

			DataSet<Tuple2<Long, Long>> input = env.fromElements(new Tuple2<Long, Long>(0L, 0L));

			DeltaIteration<Tuple2<Long, Long>, Tuple2<Long, Long>> deltaIteration = input.iterateDelta(input, 10,0);

			DataSet<Tuple2<Long, Long>> delta = deltaIteration.getSolutionSet().join(deltaIteration.getWorkset())
														.where(0).equalTo(0)
														.projectFirst(1).projectSecond(1);

			DataSet<Tuple2<Long, Long>> nextWorkset = deltaIteration.getSolutionSet().join(input)
														.where(0).equalTo(0)
														.projectFirst(1).projectSecond(1);
			

			DataSet<Tuple2<Long, Long>> result = deltaIteration.closeWith(delta, nextWorkset);

			result.output(new DiscardingOutputFormat<Tuple2<Long, Long>>());
			
			Plan p = env.createProgramPlan();
			try {
				compileNoStats(p);
				fail("Should not be able to compile, since the next workset does not depend on the workset");
			}
			catch (CompilerException e) {
				// good
			}
			catch (Exception e) {
				fail("wrong exception type");
			}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
}