io.debezium.util

Class Iterators

java.lang.Object

io.debezium.util.Iterators

@Immutable
public class Iterators
extends Object

A utility for creating iterators.

Author:

Randall Hauch

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Iterators.PreviewIterator<T> A read only iterator that is able to preview the next value without consuming it or altering the behavior or semantics of the normal Iterator methods.
static interface	Iterators.TransformedIterator<F,T> An iterator that is able to transform its contents to another type.

Constructor Summary

Constructors

Constructor and Description
Iterators()

Method Summary

Modifier and Type	Method and Description
static <T,U,V> Iterator<V>	around(Iterable<? extends T> first, Iterable<? extends U> second, BiFunction<T,U,V> conversion)
static <V,T> Iterator<T>	around(Iterable<? extends V> iterable, Function<V,T> conversion)
static <T,U,V> Iterator<V>	around(Iterator<? extends T> first, Iterator<? extends U> second, BiFunction<T,U,V> combineFirstAndSecond)
static <V,T> Iterator<T>	around(Iterator<? extends V> iterator, Function<V,T> conversion)
static <T> Iterable<T>	around(Iterator<T> iterator)
static <T> Iterator<T>	empty()
static <T> Iterator<T>	join(Iterable<T> first, Iterable<T> second)
static <T> Iterator<T>	join(Iterable<T> first, T last)
static <T> Iterator<T>	join(Iterable<T> first, T last1, T last2)
static <T> Iterator<T>	join(Iterable<T> first, T last1, T last2, T last3)
static <T> Iterator<T>	join(Iterable<T> first, T last1, T last2, T last3, T last4)
static <T> Iterator<T>	join(Iterator<T> first, Iterator<T> second)
static <T> Iterators.PreviewIterator<T>	preview(Iterator<T> iter) Get a read-only iterator that can peek at the next value before it is retrieved with Iterator.next().
static <T> Iterator<T>	readOnly(Iterable<T> iterable)
static <V,T> Iterator<T>	readOnly(Iterable<V> iterable, Function<V,T> conversion)
static <V,T> Iterator<T>	readOnly(Iterator<? extends V> iterator, Function<V,T> conversion)
static <T> Iterator<T>	readOnly(Iterator<T> iterator)
static <V,T> Iterable<T>	readOnlyIterable(Iterable<? extends V> iterable, Function<V,T> conversion)
static <T> Iterable<T>	readOnlyIterable(Iterable<T> iterable)
static <T> Iterable<T>	toIterable(Iterator<T> iterator) Get an Iterable from an Iterator.
static <F,T> Iterator<T>	transform(Iterator<F> fromIterator, Function<? super F,? extends T> function) Transform an iterator from a given type to super types.
static <T> Iterator<T>	with(T value)
static <T> Iterator<T>	with(T[] values)
static <T> Iterator<T>	with(T value1, T value2)
static <T> Iterator<T>	with(T value1, T value2, T value3)
static <T> Iterator<T>	with(T value1, T value2, T value3, T... additional)

Methods inherited from class java.lang.Object

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

Constructor Detail

Iterators

public Iterators()

Method Detail

empty

public static <T> Iterator<T> empty()

with

public static <T> Iterator<T> with(T value)

with

public static <T> Iterator<T> with(T value1,
                                   T value2)

with

public static <T> Iterator<T> with(T value1,
                                   T value2,
                                   T value3)

with

@SafeVarargs
public static <T> Iterator<T> with(T value1,
                                                T value2,
                                                T value3,
                                                T... additional)

with

public static <T> Iterator<T> with(T[] values)

around

public static <T,U,V> Iterator<V> around(Iterable<? extends T> first,
                                         Iterable<? extends U> second,
                                         BiFunction<T,U,V> conversion)

around

public static <T,U,V> Iterator<V> around(Iterator<? extends T> first,
                                         Iterator<? extends U> second,
                                         BiFunction<T,U,V> combineFirstAndSecond)

around

public static <V,T> Iterator<T> around(Iterable<? extends V> iterable,
                                       Function<V,T> conversion)

around

public static <V,T> Iterator<T> around(Iterator<? extends V> iterator,
                                       Function<V,T> conversion)

around

public static <T> Iterable<T> around(Iterator<T> iterator)

readOnly

public static <T> Iterator<T> readOnly(Iterator<T> iterator)

readOnly

public static <V,T> Iterator<T> readOnly(Iterator<? extends V> iterator,
                                         Function<V,T> conversion)

readOnly

public static <T> Iterator<T> readOnly(Iterable<T> iterable)

readOnly

public static <V,T> Iterator<T> readOnly(Iterable<V> iterable,
                                         Function<V,T> conversion)

readOnlyIterable

public static <T> Iterable<T> readOnlyIterable(Iterable<T> iterable)

readOnlyIterable

public static <V,T> Iterable<T> readOnlyIterable(Iterable<? extends V> iterable,
                                                 Function<V,T> conversion)

join

public static <T> Iterator<T> join(Iterable<T> first,
                                   T last)

join

public static <T> Iterator<T> join(Iterable<T> first,
                                   T last1,
                                   T last2)

join

public static <T> Iterator<T> join(Iterable<T> first,
                                   T last1,
                                   T last2,
                                   T last3)

join

public static <T> Iterator<T> join(Iterable<T> first,
                                   T last1,
                                   T last2,
                                   T last3,
                                   T last4)

join

public static <T> Iterator<T> join(Iterable<T> first,
                                   Iterable<T> second)

join

public static <T> Iterator<T> join(Iterator<T> first,
                                   Iterator<T> second)

toIterable

public static <T> Iterable<T> toIterable(Iterator<T> iterator)

Get an Iterable from an Iterator.

Type Parameters:

T - the iterator type

Parameters:

iterator - the source iterator

Returns:

the iterable

transform

public static <F,T> Iterator<T> transform(Iterator<F> fromIterator,
                                          Function<? super F,? extends T> function)

Transform an iterator from a given type to super types.

Type Parameters:

F - the source transform type

T - the destination transform type

Parameters:

fromIterator - the source iterator

function - the function to be applied when performing element transformation

Returns:

the transformed iterator

preview

public static <T> Iterators.PreviewIterator<T> preview(Iterator<T> iter)

Get a read-only iterator that can peek at the next value before it is retrieved with Iterator.next().

Parameters:

iter - the original iterator

Returns:

the peeking iterator; may be null if iter is null