org.atlanmod.commons.collect

Class MoreStreams

java.lang.Object

org.atlanmod.commons.collect.MoreStreams

@ParametersAreNonnullByDefault
public final class MoreStreams
extends Object

Static utility methods related to Stream instances.

Method Summary

Modifier and Type	Method and Description
static Optional<Integer>	indexOf(Stream<?> stream, Object value) Finds the index of the given value in the stream.
static Optional<Integer>	lastIndexOf(Stream<?> stream, Object value) Finds the last index of the given value in the stream.
static IntUnaryOperator	reverseOrder(int startInclusive, int endExclusive) Returns an unary operator to iterates over an IntStream in the reverse direction.
static LongUnaryOperator	reverseOrder(long startInclusive, long endExclusive) Returns an unary operator to iterates over an LongStream in the reverse direction.
static Optional<Integer>	size(Stream<?> stream) Returns the number of element in the stream as an integer;

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

indexOf

@Nonnull
public static Optional<Integer> indexOf(Stream<?> stream,
                                                 Object value)

Finds the index of the given value in the stream.

Parameters:

stream - the stream to search through for the object

value - the value to find

Returns:

an Optional containing the index of the value within the stream, Optional.empty() if not found

lastIndexOf

@Nonnull
public static Optional<Integer> lastIndexOf(Stream<?> stream,
                                                     Object value)

Finds the last index of the given value in the stream.

Parameters:

stream - the stream to traverse for looking for the object

value - the value to find, may be null

Returns:

an Optional containing the index of the value within the stream, Optional.empty() if not found

size

@Nonnull
public static Optional<Integer> size(Stream<?> stream)

Returns the number of element in the stream as an integer;

Parameters:

stream - the stream

Returns:

an Optional containing the size, Optional.empty() if the stream is empty

reverseOrder

@Nonnull
public static IntUnaryOperator reverseOrder(int startInclusive,
                                                     int endExclusive)

Returns an unary operator to iterates over an IntStream in the reverse direction.

Parameters:

startInclusive - the (inclusive) initial value

endExclusive - the exclusive upper bound

Returns:

an unary operator

See Also:

IntStream.range(int, int)

reverseOrder

@Nonnull
public static LongUnaryOperator reverseOrder(long startInclusive,
                                                      long endExclusive)

Returns an unary operator to iterates over an LongStream in the reverse direction.

Parameters:

startInclusive - the (inclusive) initial value

endExclusive - the exclusive upper bound

Returns:

an unary operator

See Also:

LongStream.range(long, long)