org.clafer.collection

Class Pair<A,B>

java.lang.Object

org.clafer.collection.Pair<A,B>

Type Parameters:

A - the type of fst

B - the type of snd

public class Pair<A,B>
extends Object

A 2-tuple.

Author:

jimmy

Constructor Summary

Constructors

Constructor and Description
Pair(A fst, B snd) Construct a tuple.
Pair(Pair<? extends A,? extends B> pair)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)
A	getFst()
B	getSnd()
int	hashCode()
static <A,B> List<A>	mapFst(List<Pair<A,B>> pairs) Returns the first element of the tuples in the same order.
static <A,B> A[]	mapFst(Pair<A,B>[] pairs, A... array) Returns the first element of the tuples in the same order.
static <A,B> List<B>	mapSnd(List<Pair<A,B>> pairs) Returns the second element of the tuples in the same order.
static <A,B> B[]	mapSnd(Pair<A,B>[] pairs, B... array) Returns the second element of the tuples in the same order.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Pair

public Pair(A fst,
    B snd)

Construct a tuple.

Parameters:

fst -

snd -

Pair

public Pair(Pair<? extends A,? extends B> pair)

Method Detail

getFst

public A getFst()

getSnd

public B getSnd()

mapFst

public static <A,B> List<A> mapFst(List<Pair<A,B>> pairs)

Returns the first element of the tuples in the same order. Equivalent to the Haskell code map fst.

Type Parameters:

A - the type of first element in the pairs

B - the type of second element in the pairs

Parameters:

pairs - the tuples

Returns:

the first element of the tuples

mapFst

@SafeVarargs
public static <A,B> A[] mapFst(Pair<A,B>[] pairs,
                           A... array)

Returns the first element of the tuples in the same order. Equivalent to the Haskell code map fst.

Type Parameters:

A - the type of first element in the pairs

B - the type of second element in the pairs

Parameters:

pairs - the tuples

array - the array to write to if the size is correct

Returns:

the first element of the tuples

mapSnd

public static <A,B> List<B> mapSnd(List<Pair<A,B>> pairs)

Returns the second element of the tuples in the same order. Equivalent to the Haskell code map snd.

Type Parameters:

A - the type of first element in the pairs

B - the type of second element in the pairs

Parameters:

pairs - the tuples

Returns:

the second element of the tuples

mapSnd

@SafeVarargs
public static <A,B> B[] mapSnd(Pair<A,B>[] pairs,
                           B... array)

Returns the second element of the tuples in the same order. Equivalent to the Haskell code map snd.

Type Parameters:

A - the type of first element in the pairs

B - the type of second element in the pairs

Parameters:

pairs - the tuples

array - the array to write to if the size is correct

Returns:

the second element of the tuples

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object