SerDeCompatibilityTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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package org.apache.datasketches.frequencies;

import org.apache.datasketches.common.ArrayOfItemsSerDe;
import org.apache.datasketches.common.ArrayOfLongsSerDe;
import org.apache.datasketches.memory.WritableMemory;
import org.testng.Assert;
import org.testng.annotations.Test;

public class SerDeCompatibilityTest {

  static final ArrayOfItemsSerDe<Long> serDe = new ArrayOfLongsSerDe();

  @Test
  public void itemsToLongs() {
    final ItemsSketch<Long> sketch1 = new ItemsSketch<>(8);
    sketch1.update(1L);
    sketch1.update(2L);
    sketch1.update(3L);
    sketch1.update(4L);

    final byte[] bytes = sketch1.toByteArray(serDe);
    final LongsSketch sketch2 = LongsSketch.getInstance(WritableMemory.writableWrap(bytes));
    sketch2.update(2L);
    sketch2.update(3L);
    sketch2.update(2L);

    Assert.assertFalse(sketch2.isEmpty());
    Assert.assertEquals(sketch2.getNumActiveItems(), 4);
    Assert.assertEquals(sketch2.getStreamLength(), 7);
    Assert.assertEquals(sketch2.getEstimate(1L), 1);
    Assert.assertEquals(sketch2.getEstimate(2L), 3);
    Assert.assertEquals(sketch2.getEstimate(3L), 2);
    Assert.assertEquals(sketch2.getEstimate(4L), 1);
  }

  @Test
  public void longsToItems() {
    final LongsSketch sketch1 = new LongsSketch(8);
    sketch1.update(1L);
    sketch1.update(2L);
    sketch1.update(3L);
    sketch1.update(4L);

    final byte[] bytes = sketch1.toByteArray();
    final ItemsSketch<Long> sketch2 = ItemsSketch.getInstance(WritableMemory.writableWrap(bytes), serDe);
    sketch2.update(2L);
    sketch2.update(3L);
    sketch2.update(2L);

    Assert.assertFalse(sketch2.isEmpty());
    Assert.assertEquals(sketch2.getNumActiveItems(), 4);
    Assert.assertEquals(sketch2.getStreamLength(), 7);
    Assert.assertEquals(sketch2.getEstimate(1L), 1);
    Assert.assertEquals(sketch2.getEstimate(2L), 3);
    Assert.assertEquals(sketch2.getEstimate(3L), 2);
    Assert.assertEquals(sketch2.getEstimate(4L), 1);
  }

}