Examples of org.apache.flink.util.NumberSequenceIterator

org.apache.flink.util.NumberSequenceIterator
The {@code NumberSequenceIterator} is an iterator that returns a sequence of numbers (as {@code Long})s. The iterator is splittable (as defined by {@link SplittableIterator}, i.e., it can be divided into multiple iterators that each return a subsequence of the number sequence.

   * @param from The number to start at (inclusive).
   * @param to The number to stop at (inclusive).
   * @return A DataSet, containing all number in the {@code [from, to]} interval.
   */
  public DataSource<Long> generateSequence(long from, long to) {
    return fromParallelCollection(new NumberSequenceIterator(from, to), BasicTypeInfo.LONG_TYPE_INFO);
  }

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public class NumberSequenceIteratorTest {


  @Test
  public void testSplitRegular() {
    testSplitting(new NumberSequenceIterator(0, 10), 2);
    testSplitting(new NumberSequenceIterator(100, 100000), 7);
    testSplitting(new NumberSequenceIterator(-100, 0), 5);
    testSplitting(new NumberSequenceIterator(-100, 100), 3);
  }

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    testSplitting(new NumberSequenceIterator(-100, 100), 3);
  }
  
  @Test
  public void testSplittingLargeRangesBy2() {
    testSplitting(new NumberSequenceIterator(0, Long.MAX_VALUE), 2);
    testSplitting(new NumberSequenceIterator(-1000000000L, Long.MAX_VALUE), 2);
    testSplitting(new NumberSequenceIterator(Long.MIN_VALUE, Long.MAX_VALUE), 2);
  }

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    testSplitting(new NumberSequenceIterator(Long.MIN_VALUE, Long.MAX_VALUE), 2);
  }
  
  @Test
  public void testSplittingTooSmallRanges() {
    testSplitting(new NumberSequenceIterator(0, 0), 2);
    testSplitting(new NumberSequenceIterator(-5, -5), 2);
    testSplitting(new NumberSequenceIterator(-5, -4), 3);
    testSplitting(new NumberSequenceIterator(10, 15), 10);
  }

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