parquet-format-structures/src/test/java/org/apache/parquet/format/TestUtil.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.parquet.format;

import static java.util.Arrays.asList;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNull;
import static org.apache.parquet.format.Util.readFileMetaData;
import static org.apache.parquet.format.Util.writeFileMetaData;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import org.junit.Test;

import org.apache.parquet.format.Util.DefaultFileMetaDataConsumer;
public class TestUtil {

  @Test
  public void testReadFileMetadata() throws Exception {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    FileMetaData md = new FileMetaData(
        1,
        asList(new SchemaElement("foo")),
        10,
        asList(
            new RowGroup(
                asList(
                    new ColumnChunk(0),
                    new ColumnChunk(1)
                    ),
                10,
                5),
            new RowGroup(
                asList(
                    new ColumnChunk(2),
                    new ColumnChunk(3)
                    ),
                11,
                5)
        )
    );
    writeFileMetaData(md , baos);
    FileMetaData md2 = readFileMetaData(in(baos));
    FileMetaData md3 = new FileMetaData();
    readFileMetaData(in(baos), new DefaultFileMetaDataConsumer(md3));
    FileMetaData md4 = new FileMetaData();
    readFileMetaData(in(baos), new DefaultFileMetaDataConsumer(md4), true);
    FileMetaData md5 = readFileMetaData(in(baos), true);
    FileMetaData md6 = readFileMetaData(in(baos), false);
    assertEquals(md, md2);
    assertEquals(md, md3);
    assertNull(md4.getRow_groups());
    assertNull(md5.getRow_groups());
    assertEquals(md4, md5);
    md4.setRow_groups(md.getRow_groups());
    md5.setRow_groups(md.getRow_groups());
    assertEquals(md, md4);
    assertEquals(md, md5);
    assertEquals(md4, md5);
    assertEquals(md, md6);
  }

  private ByteArrayInputStream in(ByteArrayOutputStream baos) {
    return new ByteArrayInputStream(baos.toByteArray());
  }
}