flink-java/src/test/java/org/apache/flink/api/java/operator/ProjectionOperatorTest.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.flink.api.java.operator;

import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;

import org.junit.Assert;
import org.junit.Test;

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

/**
 * Tests for {@link DataSet#project(int...)}.
 */
public class ProjectionOperatorTest {

	// TUPLE DATA

	private final List<Tuple5<Integer, Long, String, Long, Integer>> emptyTupleData =
			new ArrayList<Tuple5<Integer, Long, String, Long, Integer>>();

	private final TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>> tupleTypeInfo = new
			TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>>(
					BasicTypeInfo.INT_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.STRING_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.INT_TYPE_INFO
			);

	// LONG DATA

	private final List<Long> emptyLongData = new ArrayList<Long>();

	@Test
	public void testFieldsProjection() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(0);
		} catch (Exception e) {
			Assert.fail();
		}

		// should not work: too many fields
		try {
			tupleDs.project(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25);
			Assert.fail();
		} catch (IllegalArgumentException iae) {
			// we're good here
		} catch (Exception e) {
			Assert.fail();
		}

		// should not work: index out of bounds of input tuple
		try {
			tupleDs.project(0, 5, 2);
			Assert.fail();
		} catch (IndexOutOfBoundsException ioobe) {
			// we're good here
		} catch (Exception e) {
			Assert.fail();
		}

		// should not work: not applied to tuple dataset
		DataSet<Long> longDs = env.fromCollection(emptyLongData, BasicTypeInfo.LONG_TYPE_INFO);
		try {
			longDs.project(0);
			Assert.fail();
		} catch (UnsupportedOperationException uoe) {
			// we're good here
		} catch (Exception e) {
			Assert.fail();
		}

	}

	@Test
	public void testProjectionTypes() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(0);
		} catch (Exception e) {
			Assert.fail();
		}

		// should work: dummy types() here
		try {
			tupleDs.project(2, 1, 4);
		} catch (Exception e) {
			Assert.fail();
		}

	}

	@Test
	public void testProjectionWithoutTypes() {

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(2, 0, 4);
		} catch (Exception e) {
			Assert.fail();
		}

		// should not work: field index is out of bounds of input tuple
		try {
			tupleDs.project(2, -1, 4);
			Assert.fail();
		} catch (IndexOutOfBoundsException iob) {
			// we're good here
		} catch (Exception e) {
			Assert.fail();
		}

		// should not work: field index is out of bounds of input tuple
		try {
			tupleDs.project(2, 1, 4, 5, 8, 9);
			Assert.fail();
		} catch (IndexOutOfBoundsException iob) {
			// we're good here
		} catch (Exception e) {
			Assert.fail();
		}

	}

}