SelectorFunctionKeysTest.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.common.operators;

import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.api.common.operators.ExpressionKeysTest.PojoWithMultiplePojos;
import org.apache.flink.api.common.operators.ExpressionKeysTest.Pojo1;
import org.apache.flink.api.common.operators.ExpressionKeysTest.Pojo2;

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

public class SelectorFunctionKeysTest {

	@Test
	public void testAreCompatible1() throws Keys.IncompatibleKeysException {
		TypeInformation<Pojo2> t1 = TypeExtractor.getForClass(Pojo2.class);
		TypeInformation<Tuple2<Integer, String>> t2 =
			new TupleTypeInfo<>(BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO);

		Keys<Pojo2> k1 = new Keys.SelectorFunctionKeys<>(
			new KeySelector1(),
			t1,
			BasicTypeInfo.STRING_TYPE_INFO
		);
		Keys<Tuple2<Integer, String>> k2 = new Keys.SelectorFunctionKeys<>(
			new KeySelector2(),
			t2,
			BasicTypeInfo.STRING_TYPE_INFO
		);

		Assert.assertTrue(k1.areCompatible(k2));
		Assert.assertTrue(k2.areCompatible(k1));
	}

	@Test
	public void testAreCompatible2() throws Keys.IncompatibleKeysException {
		TypeInformation<PojoWithMultiplePojos> t1 = TypeExtractor.getForClass(PojoWithMultiplePojos.class);
		TypeInformation<Tuple3<Long, Pojo1, Integer>> t2 = new TupleTypeInfo<>(
			BasicTypeInfo.LONG_TYPE_INFO,
			TypeExtractor.getForClass(Pojo1.class),
			BasicTypeInfo.INT_TYPE_INFO);
		TypeInformation<Tuple2<Integer, String>> kt = new TupleTypeInfo<>(
			BasicTypeInfo.INT_TYPE_INFO,
			BasicTypeInfo.STRING_TYPE_INFO
		);

		Keys<PojoWithMultiplePojos> k1 = new Keys.SelectorFunctionKeys<>(
			new KeySelector3(),
			t1,
			kt
		);
		Keys<Tuple3<Long, Pojo1, Integer>> k2 = new Keys.SelectorFunctionKeys<>(
			new KeySelector4(),
			t2,
			kt
		);

		Assert.assertTrue(k1.areCompatible(k2));
		Assert.assertTrue(k2.areCompatible(k1));
	}

	@Test
	public void testAreCompatible3() throws Keys.IncompatibleKeysException {
		TypeInformation<String> t1 = BasicTypeInfo.STRING_TYPE_INFO;
		TypeInformation<Pojo2> t2 = TypeExtractor.getForClass(Pojo2.class);

		Keys.ExpressionKeys<String> ek1 = new Keys.ExpressionKeys<>("*", t1);
		Keys<Pojo2> sk2 = new Keys.SelectorFunctionKeys<>(
			new KeySelector1(),
			t2,
			BasicTypeInfo.STRING_TYPE_INFO
		);

		Assert.assertTrue(sk2.areCompatible(ek1));
	}

	@Test
	public void testAreCompatible4() throws Keys.IncompatibleKeysException {
		TypeInformation<Tuple3<String, Long, Integer>> t1 = new TupleTypeInfo<>(
			BasicTypeInfo.STRING_TYPE_INFO,
			BasicTypeInfo.LONG_TYPE_INFO,
			BasicTypeInfo.INT_TYPE_INFO
		);
		TypeInformation<PojoWithMultiplePojos> t2 = TypeExtractor.getForClass(PojoWithMultiplePojos.class);

		Keys.ExpressionKeys<Tuple3<String, Long, Integer>> ek1 = new Keys.ExpressionKeys<>(new int[]{2,0}, t1);
		Keys<PojoWithMultiplePojos> sk2 = new Keys.SelectorFunctionKeys<>(
			new KeySelector3(),
			t2,
			new TupleTypeInfo<Tuple2<Integer, String>>(BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO)
		);

		Assert.assertTrue(sk2.areCompatible(ek1));
	}

	@Test
	public void testOriginalTypes1() throws Keys.IncompatibleKeysException {
		TypeInformation<Tuple2<Integer, String>> t2 = new TupleTypeInfo<>(
				BasicTypeInfo.INT_TYPE_INFO,
				BasicTypeInfo.STRING_TYPE_INFO
		);

		Keys<Tuple2<Integer, String>> k = new Keys.SelectorFunctionKeys<>(
				new KeySelector2(),
				t2,
				BasicTypeInfo.STRING_TYPE_INFO
		);

		Assert.assertArrayEquals(
				new TypeInformation<?>[] { BasicTypeInfo.STRING_TYPE_INFO },
				k.getOriginalKeyFieldTypes()
		);
	}

	@Test
	public void testOriginalTypes2() throws Exception {
		final TupleTypeInfo<Tuple2<Integer, String>> t1 = new TupleTypeInfo<>(
				BasicTypeInfo.INT_TYPE_INFO,
				BasicTypeInfo.STRING_TYPE_INFO
		);
		TypeInformation<PojoWithMultiplePojos> t2 = TypeExtractor.getForClass(PojoWithMultiplePojos.class);

		Keys<PojoWithMultiplePojos> sk = new Keys.SelectorFunctionKeys<>(
				new KeySelector3(),
				t2,
				t1
		);

		Assert.assertArrayEquals(
				new TypeInformation<?>[] { t1 },
				sk.getOriginalKeyFieldTypes()
		);
	}

	@SuppressWarnings("serial")
	public static class KeySelector1 implements KeySelector<Pojo2, String> {

		@Override
		public String getKey(Pojo2 v) throws Exception {
			return v.b2;
		}
	}

	@SuppressWarnings("serial")
	public static class KeySelector2 implements KeySelector<Tuple2<Integer, String>, String> {

		@Override
		public String getKey(Tuple2<Integer, String> v) throws Exception {
			return v.f1;
		}
	}

	@SuppressWarnings("serial")
	public static class KeySelector3 implements KeySelector<PojoWithMultiplePojos, Tuple2<Integer, String>> {

		@Override
		public Tuple2<Integer, String> getKey(PojoWithMultiplePojos v) throws Exception {
			return new Tuple2<>(v.i0, v.p1.b);
		}
	}

	@SuppressWarnings("serial")
	public static class KeySelector4 implements KeySelector<Tuple3<Long, Pojo1, Integer>, Tuple2<Integer, String>> {

		@Override
		public Tuple2<Integer, String> getKey(Tuple3<Long, Pojo1, Integer> v) throws Exception {
			return new Tuple2<>(v.f2, v.f1.a);
		}
	}
}