com.github.martincooper.datatable

Class TransformCollector<T,U>

java.lang.Object

com.github.martincooper.datatable.TransformCollector<T,U>

Type Parameters:

T - The collection type.

U - The return type.

All Implemented Interfaces:

Collector<T,ArrayList<T>,U>

public class TransformCollector<T,U>
extends Object
implements Collector<T,ArrayList<T>,U>

TransformCollector. Custom Collector. Used to pass the contents of a collection to a single method, returning a single value.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.stream.Collector

Collector.Characteristics

Constructor Summary

Constructors

Constructor and Description
TransformCollector(Function<io.vavr.collection.Stream<T>,U> function) TransformCollector constructor.

Method Summary

Modifier and Type	Method and Description
BiConsumer<ArrayList<T>,T>	accumulator() The accumulator.
Set<Collector.Characteristics>	characteristics() Default set of characteristics.
BinaryOperator<ArrayList<T>>	combiner()
Function<ArrayList<T>,U>	finisher() The finisher has all the items in the list.
Supplier<ArrayList<T>>	supplier() The supplier.
static <T,U> TransformCollector<T,U>	transform(Function<io.vavr.collection.Stream<T>,U> function) as method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.stream.Collector

of, of

Constructor Detail

TransformCollector

public TransformCollector(Function<io.vavr.collection.Stream<T>,U> function)

TransformCollector constructor.

Parameters:

function - The function to run on the collected items.

Method Detail

transform

public static <T,U> TransformCollector<T,U> transform(Function<io.vavr.collection.Stream<T>,U> function)

as method. Static helper to return a new instance of the Transform Collector class.

Type Parameters:

T - The collection type.

U - The return type.

Parameters:

function - The function to run on the full collection.

Returns:

Returns a new instance of the collector.

supplier

public Supplier<ArrayList<T>> supplier()

The supplier. Returns a new ArrayList which builds up the final item list.

Specified by:

supplier in interface Collector<T,ArrayList<T>,U>

Returns:

Returns the ArrayList.

accumulator

public BiConsumer<ArrayList<T>,T> accumulator()

The accumulator. In this case, just append the item to the list.

Specified by:

accumulator in interface Collector<T,ArrayList<T>,U>

Returns:

Return the ArrayList

combiner

public BinaryOperator<ArrayList<T>> combiner()

Specified by:

combiner in interface Collector<T,ArrayList<T>,U>

finisher

public Function<ArrayList<T>,U> finisher()

The finisher has all the items in the list. Now we just need to run the requested transform function on it to get the final results.

Specified by:

finisher in interface Collector<T,ArrayList<T>,U>

Returns:

Returns the result after passed through the transform function.

characteristics

public Set<Collector.Characteristics> characteristics()

Default set of characteristics.

Specified by:

characteristics in interface Collector<T,ArrayList<T>,U>

Returns:

Returns the default set of characteristics.