org.grouplens.lenskit.util

Class Functional

java.lang.Object

org.grouplens.lenskit.util.Functional

public final class Functional
extends Object

Functional-style utilities to go with Guava.

Method Summary

Modifier and Type	Method and Description
static <F,T> Function<F,T>	cast(Class<T> target) Identity function casting its arguments to a particular type.
static <T> Function<T,Equivalence.Wrapper<T>>	equivWrap(Equivalence<T> equiv) A function that wraps objects according to an equivalence relation.
static Funnel<Object>	serializeFunnel() A Funnel that serializes an object to the sink.

Methods inherited from class java.lang.Object

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

Method Detail

equivWrap

public static <T> Function<T,Equivalence.Wrapper<T>> equivWrap(Equivalence<T> equiv)

A function that wraps objects according to an equivalence relation.

Parameters:

equiv - The equivalence.

T - The type of object to wrap.

Returns:

A function that wraps its arguments in an equivalence wrapper.

See Also:

Equivalence.wrap(Object)

serializeFunnel

public static Funnel<Object> serializeFunnel()

A Funnel that serializes an object to the sink.

Returns:

A funnel that funnels objects by serializing them.

cast

public static <F,T> Function<F,T> cast(Class<T> target)

Identity function casting its arguments to a particular type.

Parameters:

F - The function’s input type.

T - The type to which to cast arguments.

target - The target type for arguments.

Returns:

A function which, when applied to an object, casts it to type target.