flink-java/src/test/java/org/apache/flink/api/java/TypeExtractionTest.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;

import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.typeutils.TypeInfoParser;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Tests concerning type extraction by ExecutionEnvironment methods.
 */
@SuppressWarnings("serial")
public class TypeExtractionTest {

	@SuppressWarnings({"unchecked", "rawtypes"})
	@Test
	public void testFunctionWithMissingGenericsAndReturns() {

		RichMapFunction function = new RichMapFunction() {
			private static final long serialVersionUID = 1L;

			@Override
			public Object map(Object value) throws Exception {
				return null;
			}
		};

		TypeInformation<?> info = ExecutionEnvironment.getExecutionEnvironment()
				.fromElements("arbitrary", "data")
				.map(function).returns("String").getResultType();

		assertEquals(TypeInfoParser.parse("String"), info);
	}

	@Test
	public void testGetterSetterWithVertex() {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		env.fromElements(new VertexTyped(0L, 3.0), new VertexTyped(1L, 1.0));
	}

	// ------------------------------------------------------------------------
	//  Test types
	// ------------------------------------------------------------------------

	/**
	 * Representation of Vertex with maximum of 2 keys and a value.
	 * @param <K> keys type
	 * @param <V> value type
	 */
	public static class Vertex<K, V> {

		private K key1;
		private K key2;
		private V value;

		public Vertex() {}

		public Vertex(K key, V value) {
			this.key1 = key;
			this.key2 = key;
			this.value = value;
		}

		public Vertex(K key1, K key2, V value) {
			this.key1 = key1;
			this.key2 = key2;
			this.value = value;
		}

		public void setKey1(K key1) {
			this.key1 = key1;
		}

		public void setKey2(K key2) {
			this.key2 = key2;
		}

		public K getKey1() {
			return key1;
		}

		public K getKey2() {
			return key2;
		}

		public void setValue(V value) {
			this.value = value;
		}

		public V getValue() {
			return value;
		}
	}

	/**
	 * A {@link Vertex} with {@link Long} as key and {@link Double} as value.
	 */
	public static class VertexTyped extends Vertex<Long, Double>{
		public VertexTyped(Long l, Double d) {
			super(l, d);
		}

		public VertexTyped() {
		}
	}
}