com.aol.cyclops.data.collections

Class PVectors

java.lang.Object

com.aol.cyclops.data.collections.PVectors

public class PVectors
extends java.lang.Object

Class for working with Persistent Vectors from PCollections Roughly Analogous to mutable ArrayLists

Constructor Summary

Constructors

Constructor and Description
PVectors()

Method Summary

Modifier and Type	Method and Description
static <T> org.pcollections.PVector<T>	empty() List<String> empty = PVectors.empty(); //or PVector<String> empty = PVectors.empty();
static <T> org.pcollections.PVector<T>	fromCollection(java.util.Collection<T> values) Create a PVector from the supplied Colleciton
static <T> org.pcollections.PVector<T>	fromStream(java.util.stream.Stream<T> stream) Reduce (immutable Collection) a Stream to a PVector
static <T> org.pcollections.PVector<T>	of(T... values) Construct a PVector from the provided values
static <T> org.pcollections.PVector<T>	singleton(T value) Construct a PVector containing a single value
static <T> Reducer<org.pcollections.PVector<T>>	toPVector() PVector<String> list = ReactiveSeq.of("a","b","c").mapReduce(PVectors.toPVector() //list = ["a","b","c"] PVector<String> list = PVectors.toPVector().reduce(Stream.of("a","b","c"))); //list = ["a","b","c"]

Methods inherited from class java.lang.Object

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

Constructor Detail

PVectors

public PVectors()

Method Detail

of

public static <T> org.pcollections.PVector<T> of(T... values)

Construct a PVector from the provided values

  
  List<String> list = PVectors.of("a","b","c");
  
  // or
  
  PVector<String> list = PVectors.of("a","b","c");
  
  
 
 

Parameters:

values - To add to PVector

Returns:

new PVector

empty

public static <T> org.pcollections.PVector<T> empty()

  
     List<String> empty = PVectors.empty();
    //or
    
     PVector<String> empty = PVectors.empty();
 
 

Returns:

an empty PVector

singleton

public static <T> org.pcollections.PVector<T> singleton(T value)

Construct a PVector containing a single value List<String> single = PVectors.singleton("1"); //or PVector<String> single = PVectors.singleton("1");

Parameters:

value - Single value for PVector

Returns:

PVector with a single value

fromCollection

public static <T> org.pcollections.PVector<T> fromCollection(java.util.Collection<T> values)

Create a PVector from the supplied Colleciton

  
   PVector<Integer> list = PVectors.fromCollection(Arrays.asList(1,2,3));
   
 
 

Parameters:

values - to add to new PVector

Returns:

PVector containing values

fromStream

public static <T> org.pcollections.PVector<T> fromStream(java.util.stream.Stream<T> stream)

Reduce (immutable Collection) a Stream to a PVector

  
    PVector<Integer> list = PVectors.fromStream(Stream.of(1,2,3));
 
  //list = [1,2,3]
 

Parameters:

stream - to convert to a PVector

Returns:

toPVector

public static <T> Reducer<org.pcollections.PVector<T>> toPVector()

  
   PVector<String> list = ReactiveSeq.of("a","b","c").mapReduce(PVectors.toPVector()
   //list = ["a","b","c"]
   PVector<String> list = PVectors.toPVector().reduce(Stream.of("a","b","c")));
    //list = ["a","b","c"]
 
 

Returns:

a Monoid / Reducer that can be used to convert a Stream to a PVector