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TestWriteReadAvroRecord.java
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TestWriteReadAvroRecord.java
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/*
* 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.arrow;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import org.apache.avro.Schema;
import org.apache.avro.file.DataFileReader;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DatumWriter;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
public class TestWriteReadAvroRecord {
@ClassRule
public static final TemporaryFolder TMP = new TemporaryFolder();
@Test
public void testWriteAndRead() throws Exception {
File dataFile = TMP.newFile();
Path schemaPath = Paths.get(TestWriteReadAvroRecord.class.getResource("/").getPath(), "schema", "test.avsc");
Schema schema = new Schema.Parser().parse(schemaPath.toFile());
//write data to disk
GenericRecord user1 = new GenericData.Record(schema);
user1.put("name", "Alyssa");
user1.put("favorite_number", 256);
GenericRecord user2 = new GenericData.Record(schema);
user2.put("name", "Ben");
user2.put("favorite_number", 7);
user2.put("favorite_color", "red");
DatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<GenericRecord>(schema);
DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<GenericRecord>(datumWriter);
dataFileWriter.create(schema, dataFile);
dataFileWriter.append(user1);
dataFileWriter.append(user2);
dataFileWriter.close();
//read data from disk
DatumReader<GenericRecord> datumReader = new GenericDatumReader<GenericRecord>(schema);
DataFileReader<GenericRecord>
dataFileReader = new DataFileReader<GenericRecord>(dataFile, datumReader);
List<GenericRecord> result = new ArrayList<>();
while (dataFileReader.hasNext()) {
GenericRecord user = dataFileReader.next();
result.add(user);
}
assertEquals(2, result.size());
GenericRecord deUser1 = result.get(0);
assertEquals("Alyssa", deUser1.get("name").toString());
assertEquals(256, deUser1.get("favorite_number"));
assertEquals(null, deUser1.get("favorite_color"));
GenericRecord deUser2 = result.get(1);
assertEquals("Ben", deUser2.get("name").toString());
assertEquals(7, deUser2.get("favorite_number"));
assertEquals("red", deUser2.get("favorite_color").toString());
}
}