Java Code Examples for java.util.stream.DoubleStream#count()

The following examples show how to use java.util.stream.DoubleStream#count() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: ShiftingWindowAveragingLongTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_average_an_empty_stream_into_a_stream_of_an_empty_stream() {
    // Given
    // a trick to create an empty ORDERED stream
    Stream<Long> longs = Stream.of(1L, 2L, 3L).filter(l -> l == 0);
    int groupingFactor = 3;

    // When
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingLong(longs, groupingFactor, Long::valueOf);
    long numberOfRolledStreams = stream.count();

    // Then
    assertThat(numberOfRolledStreams).isEqualTo(1);
}
Example 2
Source File: ShiftingWindowAveragingLongTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_correctly_count_the_elements_of_a_sized_stream() {
    // Given
    Stream<String> strings = Stream.of("1", "2", "3", "4", "5", "6", "7");
    int groupingFactor = 3;
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingLong(strings, groupingFactor, Long::parseLong);

    // When
    long count = stream.count();

    // Then
    assertThat(count).isEqualTo(5L);
}
Example 3
Source File: ShiftingWindowAveragingIntTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_average_an_empty_stream_into_a_stream_of_an_empty_stream() {
    // Given
    // a trick to create an empty ORDERED stream
    Stream<Integer> ints = Stream.of(1, 2, 3).filter(i -> i == 0);
    int groupingFactor = 3;

    // When
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingInt(ints, groupingFactor, Integer::valueOf);
    long numberOfRolledStreams = stream.count();

    // Then
    assertThat(numberOfRolledStreams).isEqualTo(1);
}
Example 4
Source File: ShiftingWindowAveragingIntTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_correctly_count_the_elements_of_a_sized_stream() {
    // Given
    Stream<String> strings = Stream.of("1", "2", "3", "4", "5", "6", "7");
    int groupingFactor = 3;
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingInt(strings, groupingFactor, Integer::parseInt);

    // When
    long count = stream.count();

    // Then
    assertThat(count).isEqualTo(5L);
}
Example 5
Source File: ShiftingWindowAveragingDoubleTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_average_an_empty_stream_into_a_stream_of_an_empty_stream() {
    // Given
    // a trick to create an empty ORDERED stream
    Stream<Double> longs = Stream.of(1d, 2d, 3d).filter(d -> d == 0);
    int groupingFactor = 3;

    // When
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingDouble(longs, groupingFactor, Double::valueOf);
    long numberOfRolledStreams = stream.count();

    // Then
    assertThat(numberOfRolledStreams).isEqualTo(1);
}
Example 6
Source File: ShiftingWindowAveragingDoubleTest.java    From streams-utils with Apache License 2.0 5 votes vote down vote up 
@Test
public void should_correctly_count_the_elements_of_a_sized_stream() {
    // Given
    Stream<String> strings = Stream.of("1", "2", "3", "4", "5", "6", "7");
    int groupingFactor = 3;
    DoubleStream stream = StreamsUtils.shiftingWindowAveragingDouble(strings, groupingFactor, Double::parseDouble);

    // When
    long count = stream.count();

    // Then
    assertThat(count).isEqualTo(5L);
}