RunLengthBitPackingHybridIntegrationTest.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 parquet.column.values.rle;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * @author Alex Levenson
 */
public class RunLengthBitPackingHybridIntegrationTest {

  @Test
  public void integrationTest() throws Exception {
    for (int i = 0; i <= 32; i++) {
      doIntegrationTest(i);
    }
  }

  private void doIntegrationTest(int bitWidth) throws Exception {
    long modValue = 1L << bitWidth;

    RunLengthBitPackingHybridEncoder encoder = new RunLengthBitPackingHybridEncoder(bitWidth, 1000);
    int numValues = 0;

    for (int i = 0; i < 100; i++) {
      encoder.writeInt((int) (i % modValue));
    }
    numValues += 100;

    for (int i = 0; i < 100; i++) {
      encoder.writeInt((int) (77 % modValue));
    }
    numValues += 100;

    for (int i = 0; i < 100; i++) {
      encoder.writeInt((int) (88 % modValue));
    }
    numValues += 100;

    for (int i = 0; i < 1000; i++) {
      encoder.writeInt((int) (i % modValue));
      encoder.writeInt((int) (i % modValue));
      encoder.writeInt((int) (i % modValue));
    }
    numValues += 3000;

    for (int i = 0; i < 1000; i++) {
      encoder.writeInt((int) (17 % modValue));
    }
    numValues += 1000;

    byte[] encodedBytes = encoder.toBytes().toByteArray();
    ByteArrayInputStream in = new ByteArrayInputStream(encodedBytes);

    RunLengthBitPackingHybridDecoder decoder = new RunLengthBitPackingHybridDecoder(bitWidth, in);

    for (int i = 0; i < 100; i++) {
      assertEquals(i % modValue, decoder.readInt());
    }

    for (int i = 0; i < 100; i++) {
      assertEquals(77 % modValue, decoder.readInt());
    }

    for (int i = 0; i < 100; i++) {
      assertEquals(88 % modValue, decoder.readInt());
    }

    for (int i = 0; i < 1000; i++) {
      assertEquals(i % modValue, decoder.readInt());
      assertEquals(i % modValue, decoder.readInt());
      assertEquals(i % modValue, decoder.readInt());
    }

    for (int i = 0; i < 1000; i++) {
      assertEquals(17 % modValue, decoder.readInt());
    }
  }
}