flink-java/src/test/java/org/apache/flink/api/java/io/CsvOutputFormatTest.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.io;

import org.apache.flink.api.common.io.FileOutputFormat;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.Path;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;

import static org.junit.Assert.fail;

/**
 * Tests for {@link CsvOutputFormat}.
 */
public class CsvOutputFormatTest {

	private String path = null;

	@Before
	public void createFile() throws Exception {
		path = File.createTempFile("csv_output_test_file", ".csv").getAbsolutePath();
	}

	@Test
	public void testNullAllow() throws Exception {
		final CsvOutputFormat<Tuple3<String, String, Integer>> csvOutputFormat = new CsvOutputFormat<>(new Path(path));
		try {
			csvOutputFormat.setWriteMode(FileSystem.WriteMode.OVERWRITE);
			csvOutputFormat.setOutputDirectoryMode(FileOutputFormat.OutputDirectoryMode.PARONLY);
			csvOutputFormat.setAllowNullValues(true);
			csvOutputFormat.open(0, 1);
			csvOutputFormat.writeRecord(new Tuple3<String, String, Integer>("One", null, 8));
		}
		finally {
			csvOutputFormat.close();
		}

		java.nio.file.Path p = Paths.get(path);
		Assert.assertTrue(Files.exists(p));
		List<String> lines = Files.readAllLines(Paths.get(path), StandardCharsets.UTF_8);
		Assert.assertEquals(1, lines.size());
		Assert.assertEquals("One,,8", lines.get(0));
	}

	@Test
	public void testNullDisallowOnDefault() throws Exception {
		final CsvOutputFormat<Tuple3<String, String, Integer>> csvOutputFormat = new CsvOutputFormat<>(new Path(path));
		try {
			csvOutputFormat.setWriteMode(FileSystem.WriteMode.OVERWRITE);
			csvOutputFormat.setOutputDirectoryMode(FileOutputFormat.OutputDirectoryMode.PARONLY);
			csvOutputFormat.open(0, 1);
			try {
				csvOutputFormat.writeRecord(new Tuple3<String, String, Integer>("One", null, 8));
				fail("should fail with an exception");
			} catch (RuntimeException e) {
				// expected
			}

		}
		finally {
			csvOutputFormat.close();
		}
	}

	@After
	public void cleanUp() throws IOException {
		Files.deleteIfExists(Paths.get(path));
	}
}