src/test/java/org/apache/datasketches/tuple/arrayofdoubles/ArrayOfDoublesCompactSketchTest.java

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package org.apache.datasketches.tuple.arrayofdoubles;

import static org.testng.Assert.assertEquals;

import java.lang.foreign.MemorySegment;

import org.apache.datasketches.common.Util;
import org.testng.Assert;
import org.testng.annotations.Test;

public class ArrayOfDoublesCompactSketchTest {

  @Test
  public void heapToDirectExactTwoDoubles() {
    ArrayOfDoublesUpdatableSketch sketch1 = new ArrayOfDoublesUpdatableSketchBuilder().setNumberOfValues(2).build();
    sketch1.update("a", new double[] {1, 2});
    sketch1.update("b", new double[] {1, 2});
    sketch1.update("c", new double[] {1, 2});
    sketch1.update("d", new double[] {1, 2});
    sketch1.update("a", new double[] {1, 2});
    sketch1.update("b", new double[] {1, 2});
    sketch1.update("c", new double[] {1, 2});
    sketch1.update("d", new double[] {1, 2});
    ArrayOfDoublesCompactSketch csk = sketch1.compact();
    MemorySegment seg = MemorySegment.ofArray(csk.toByteArray());
    ArrayOfDoublesSketch sketch2 = new DirectArrayOfDoublesCompactSketch(seg);
    Assert.assertFalse(sketch2.isEmpty());
    Assert.assertFalse(sketch2.isEstimationMode());
    Assert.assertEquals(sketch2.getEstimate(), 4.0);
    Assert.assertEquals(sketch2.getUpperBound(1), 4.0);
    Assert.assertEquals(sketch2.getLowerBound(1), 4.0);
    Assert.assertEquals(sketch2.getThetaLong(), Long.MAX_VALUE);
    Assert.assertEquals(sketch2.getTheta(), 1.0);
    double[][] values = sketch2.getValues();
    Assert.assertEquals(values.length, 4);
    for (double[] array: values) {
      Assert.assertEquals(array.length, 2);
      Assert.assertEquals(array[0], 2.0);
      Assert.assertEquals(array[1], 4.0);
    }
  }

  @Test
  public void directToHeapExactTwoDoubles() {
    ArrayOfDoublesUpdatableSketch sketch1 =
        new ArrayOfDoublesUpdatableSketchBuilder().setNumberOfValues(2).build(MemorySegment.ofArray(new byte[1000000]));
    sketch1.update("a", new double[] {1, 2});
    sketch1.update("b", new double[] {1, 2});
    sketch1.update("c", new double[] {1, 2});
    sketch1.update("d", new double[] {1, 2});
    sketch1.update("a", new double[] {1, 2});
    sketch1.update("b", new double[] {1, 2});
    sketch1.update("c", new double[] {1, 2});
    sketch1.update("d", new double[] {1, 2});
    ArrayOfDoublesSketch sketch2 =
        new HeapArrayOfDoublesCompactSketch(
            MemorySegment.ofArray(sketch1.compact(MemorySegment.ofArray(new byte[1000000])).toByteArray()));
    Assert.assertFalse(sketch2.isEmpty());
    Assert.assertFalse(sketch2.isEstimationMode());
    Assert.assertEquals(sketch2.getEstimate(), 4.0);
    Assert.assertEquals(sketch2.getUpperBound(1), 4.0);
    Assert.assertEquals(sketch2.getLowerBound(1), 4.0);
    Assert.assertEquals(sketch2.getThetaLong(), Long.MAX_VALUE);
    Assert.assertEquals(sketch2.getTheta(), 1.0);
    double[][] values = sketch2.getValues();
    Assert.assertEquals(values.length, 4);
    for (double[] array: values) {
      Assert.assertEquals(array.length, 2);
      Assert.assertEquals(array[0], 2.0);
      Assert.assertEquals(array[1], 4.0);
    }
  }

  @SuppressWarnings("unused")
  @Test
  public void checkGetValuesAndKeysMethods() {
    ArrayOfDoublesUpdatableSketchBuilder bldr = new ArrayOfDoublesUpdatableSketchBuilder();
    bldr.setNominalEntries(16).setNumberOfValues(2);

    HeapArrayOfDoublesQuickSelectSketch hqssk = (HeapArrayOfDoublesQuickSelectSketch) bldr.build();
    hqssk.update("a", new double[] {1, 2});
    hqssk.update("b", new double[] {3, 4});
    hqssk.update("c", new double[] {5, 6});
    hqssk.update("d", new double[] {7, 8});
    final double[][] values = hqssk.getValues();
    final double[] values1d = hqssk.getValuesAsOneDimension();
    final long[] keys = hqssk.getKeys();

    HeapArrayOfDoublesCompactSketch hcsk = (HeapArrayOfDoublesCompactSketch)hqssk.compact();
    final double[][] values2 = hcsk.getValues();
    final double[] values1d2 = hcsk.getValuesAsOneDimension();
    final long[] keys2 = hcsk.getKeys();
    assertEquals(values2, values);
    assertEquals(values1d2, values1d);
    assertEquals(keys2, keys);

    MemorySegment hqsskSeg = MemorySegment.ofArray(hqssk.toByteArray());

    DirectArrayOfDoublesQuickSelectSketchR dqssk =
        (DirectArrayOfDoublesQuickSelectSketchR)ArrayOfDoublesSketch.wrap(hqsskSeg, Util.DEFAULT_UPDATE_SEED);
    final double[][] values3 = dqssk.getValues();
    final double[] values1d3 = dqssk.getValuesAsOneDimension();
    final long[] keys3 = dqssk.getKeys();
    assertEquals(values3, values);
    assertEquals(values1d3, values1d);
    assertEquals(keys3, keys);

    MemorySegment hcskSeg = MemorySegment.ofArray(hcsk.toByteArray());

    Assert.assertTrue(ArrayOfDoublesSketch.wrap(hcskSeg, Util.DEFAULT_UPDATE_SEED) instanceof DirectArrayOfDoublesCompactSketch);
    final double[][] values4 = dqssk.getValues();
    final double[] values1d4 = dqssk.getValuesAsOneDimension();
    final long[] keys4 = dqssk.getKeys();
    assertEquals(values4, values);
    assertEquals(values1d4, values1d);
    assertEquals(keys4, keys);
  }

}