flink-core/src/test/java/org/apache/flink/api/java/typeutils/PojoTypeInformationTest.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.typeutils;

import static org.junit.Assert.assertTrue;

import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.CompositeType;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.junit.Test;

public class PojoTypeInformationTest {

	public static class SimplePojo {
		public String str;
		public Boolean Bl;
		public boolean bl;
		public Byte Bt;
		public byte bt;
		public Short Shrt;
		public short shrt;
		public Integer Intgr;
		public int intgr;
		public Long Lng;
		public long lng;
		public Float Flt;
		public float flt;
		public Double Dbl;
		public double dbl;
		public Character Ch;
		public char ch;
		public int[] primIntArray;
		public Integer[] intWrapperArray;
	}

	@Test
	public void testSimplePojoTypeExtraction() {
		TypeInformation<SimplePojo> type = TypeExtractor.getForClass(SimplePojo.class);
		assertTrue("Extracted type is not a composite/pojo type but should be.", type instanceof CompositeType);
	}

	public static class NestedPojoInner {
		public String field;
	}

	public static class NestedPojoOuter {
		public Integer intField;
		public NestedPojoInner inner;
	}

	@Test
	public void testNestedPojoTypeExtraction() {
		TypeInformation<NestedPojoOuter> type = TypeExtractor.getForClass(NestedPojoOuter.class);
		assertTrue("Extracted type is not a Pojo type but should be.", type instanceof CompositeType);
	}

	public static class Recursive1Pojo {
		public Integer intField;
		public Recursive2Pojo rec;
	}

	public static class Recursive2Pojo {
		public String strField;
		public Recursive1Pojo rec;
	}

	@Test
	public void testRecursivePojoTypeExtraction() {
		// This one tests whether a recursive pojo is detected using the set of visited
		// types in the type extractor. The recursive field will be handled using the generic serializer.
		TypeInformation<Recursive1Pojo> type = TypeExtractor.getForClass(Recursive1Pojo.class);
		assertTrue("Extracted type is not a Pojo type but should be.", type instanceof CompositeType);
	}
	
	@Test
	public void testRecursivePojoObjectTypeExtraction() {
		TypeInformation<Recursive1Pojo> type = TypeExtractor.getForObject(new Recursive1Pojo());
		assertTrue("Extracted type is not a Pojo type but should be.", type instanceof CompositeType);
	}
	
}