Package io.debezium.util

Class Sequences

java.lang.Object

io.debezium.util.Sequences

@Immutable
public class Sequences
extends Object

Utility methods for obtaining streams of integers.

Author:

Randall Hauch

Constructor Summary

Constructors

Constructor	Description
Sequences()

Method Summary

Modifier and Type	Method	Description
static Iterable<Integer>	infiniteIntegers()	Create an iterator over an infinite number of monotonically increasing numbers starting at 0, useful when performing an operation an unknown number of times.
static Iterable<Integer>	infiniteIntegers(int startingAt)	Create an iterator over an infinite number monotonically increasing numbers starting at the given number, useful when performing an operation an unknown number of times.
static <T> Supplier<T>	randomlySelect(T... values)	Obtain a supplier function that randomly selects from the given values.
static <T> Supplier<T>	randomlySelect(T first, T... additional)	Obtain a supplier function that randomly selects from the given values.
static IntStream	times(int number)	Create a stream of number monotonically increasing numbers starting at 0, useful when performing an operation number times.

Methods inherited from class java.lang.Object

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

Constructor Detail

Sequences

public Sequences()

Method Detail

times

public static IntStream times(int number)

Create a stream of number monotonically increasing numbers starting at 0, useful when performing an operation number times.

Parameters:

number - the number of values to include in the stream; must be positive

Returns:

the sequence; never null

infiniteIntegers

public static Iterable<Integer> infiniteIntegers()

Create an iterator over an infinite number of monotonically increasing numbers starting at 0, useful when performing an operation an unknown number of times.

Returns:

the sequence; never null

infiniteIntegers

public static Iterable<Integer> infiniteIntegers(int startingAt)

Create an iterator over an infinite number monotonically increasing numbers starting at the given number, useful when performing an operation an unknown number of times.

Parameters:

startingAt - the first number to include in the resulting stream

Returns:

the sequence; never null

randomlySelect

@SafeVarargs
public static <T> Supplier<T> randomlySelect(T first,
                                             T... additional)

Obtain a supplier function that randomly selects from the given values. If the supplied values contain nulls, then the resulting supplier function may return null values.

Parameters:

first - the first value that may be randomly picked

additional - the additional values to randomly pick from; may be null or empty

Returns:

the supplier function; never null

randomlySelect

@SafeVarargs
public static <T> Supplier<T> randomlySelect(T... values)

Obtain a supplier function that randomly selects from the given values. If the supplied values contain nulls, then the resulting supplier function may return null values.

Parameters:

values - the values to randomly pick from; may not be null, should not be empty

Returns:

the supplier function; never null