Examples with Spliterator java.util.Spliterator used on opensource projects

Example 36 with Spliterator

use of java.util.Spliterator in project streamex by amaembo.

the class LongStreamEx method scanLeft.

/**
 * Produces an array containing cumulative results of applying the
 * accumulation function going left to right.
 *
 * <p>
 * This is a terminal operation.
 *
 * <p>
 * For parallel stream it's not guaranteed that accumulator will always be
 * executed in the same thread.
 *
 * <p>
 * This method cannot take all the advantages of parallel streams as it must
 * process elements strictly left to right.
 *
 * @param accumulator a
 *        <a href="package-summary.html#NonInterference">non-interfering
 *        </a>, <a href="package-summary.html#Statelessness">stateless</a>
 *        function for incorporating an additional element into a result
 * @return the array where the first element is the first element of this
 *         stream and every successor element is the result of applying
 *         accumulator function to the previous array element and the
 *         corresponding stream element. The resulting array has the same
 *         length as this stream.
 * @see #foldLeft(LongBinaryOperator)
 * @since 0.5.1
 */
public long[] scanLeft(LongBinaryOperator accumulator) {
    Spliterator.OfLong spliterator = spliterator();
    int size = intSize(spliterator);
    LongBuffer buf = new LongBuffer(size >= 0 ? size : INITIAL_SIZE);
    delegate(spliterator).forEachOrdered(i -> buf.add(buf.size == 0 ? i : accumulator.applyAsLong(buf.data[buf.size - 1], i)));
    return buf.toArray();
}

Example 37 with Spliterator

use of java.util.Spliterator in project streamex by amaembo.

the class DoubleStreamEx method toFloatArray.

/**
 * Returns a {@code float[]} array containing the elements of this stream
 * which are converted to floats using {@code (float)} cast operation.
 *
 * <p>
 * This is a terminal operation.
 *
 * @return an array containing the elements of this stream
 * @since 0.3.0
 */
public float[] toFloatArray() {
    if (isParallel())
        return collect(DoubleCollector.toFloatArray());
    java.util.Spliterator.OfDouble spliterator = spliterator();
    int size = intSize(spliterator);
    FloatBuffer buf;
    if (size >= 0) {
        buf = new FloatBuffer(size);
        spliterator.forEachRemaining((DoubleConsumer) buf::addUnsafe);
    } else {
        buf = new FloatBuffer();
        spliterator.forEachRemaining((DoubleConsumer) buf::add);
    }
    return buf.toArray();
}

Example 38 with Spliterator

use of java.util.Spliterator in project openj9 by eclipse-openj9.

the class StringStreams method testStringCharsSpliteratorSplitting.

@Test
public void testStringCharsSpliteratorSplitting() {
    OfInt s = DIGITS.chars().spliterator();
    ArrayList<OfInt> sArray = new ArrayList<>();
    while (Objects.nonNull(s)) {
        sArray.add(s);
        s = s.trySplit();
    }
    final HashSet<Integer> actualIntegers = new HashSet<>();
    for (OfInt e : sArray) {
        e.forEachRemaining((IntConsumer) i -> actualIntegers.add(Integer.valueOf(i)));
    }
    checkDigits(actualIntegers);
}

Example 39 with Spliterator

use of java.util.Spliterator in project openj9 by eclipse-openj9.

the class StringStreams method testStringCharsSpliteratorSingleChar.

@Test
public void testStringCharsSpliteratorSingleChar() {
    Spliterator.OfInt s = SINGLECHAR.chars().spliterator();
    final ArrayList<Integer> actualIntegers = new ArrayList<>();
    s.forEachRemaining((IntConsumer) i -> actualIntegers.add(Integer.valueOf(i)));
    checkDigitsOrdered(SINGLECHAR, actualIntegers);
}

Example 40 with Spliterator

use of java.util.Spliterator in project streamex by amaembo.

the class IntStreamExTest method testDropWhile.

@Test
public void testDropWhile() {
    assertArrayEquals(new int[] { 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 }, IntStreamEx.range(100).dropWhile(i -> i % 10 < 5).limit(10).toArray());
    assertEquals(100, IntStreamEx.range(100).dropWhile(i -> i % 10 < 0).count());
    assertEquals(0, IntStreamEx.range(100).dropWhile(i -> i % 10 < 10).count());
    assertEquals(OptionalInt.of(0), IntStreamEx.range(100).dropWhile(i -> i % 10 < 0).findFirst());
    assertEquals(OptionalInt.empty(), IntStreamEx.range(100).dropWhile(i -> i % 10 < 10).findFirst());
    java.util.Spliterator.OfInt spltr = IntStreamEx.range(100).dropWhile(i -> i % 10 < 1).spliterator();
    assertTrue(spltr.tryAdvance((int x) -> assertEquals(1, x)));
    Builder builder = IntStream.builder();
    spltr.forEachRemaining(builder);
    assertArrayEquals(IntStreamEx.range(2, 100).toArray(), builder.build().toArray());
}