org.apache.crunch.fn

Class FilterFns

java.lang.Object

org.apache.crunch.fn.FilterFns

public final class FilterFns
extends Object

A collection of pre-defined FilterFn implementations.

Method Summary

Methods

Modifier and Type	Method and Description
static <S> FilterFn<S>	ACCEPT_ALL() Accept everything.
static <S> FilterFn<S>	and(FilterFn<S>... fns) Accept an entry if all of the given filters accept it, using short-circuit evaluation.
static <S> FilterFn<S>	and(FilterFn<S> fn1, FilterFn<S> fn2) Accept an entry if all of the given filters accept it, using short-circuit evaluation.
static <S> FilterFn<S>	not(FilterFn<S> fn) Accept an entry if the given filter does not accept it.
static <S> FilterFn<S>	or(FilterFn<S>... fns) Accept an entry if at least one of the given filters accept it, using short-circuit evaluation.
static <S> FilterFn<S>	or(FilterFn<S> fn1, FilterFn<S> fn2) Accept an entry if at least one of the given filters accept it, using short-circuit evaluation.
static <S> FilterFn<S>	REJECT_ALL() Reject everything.

Methods inherited from class java.lang.Object

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

Method Detail

and

public static <S> FilterFn<S> and(FilterFn<S> fn1,
                  FilterFn<S> fn2)

Accept an entry if all of the given filters accept it, using short-circuit evaluation.

Parameters:

fn1 - The first functions to delegate to

fn2 - The second functions to delegate to

Returns:

The composed filter function

and

public static <S> FilterFn<S> and(FilterFn<S>... fns)

Accept an entry if all of the given filters accept it, using short-circuit evaluation.

Parameters:

fns - The functions to delegate to (in the given order)

Returns:

The composed filter function

or

public static <S> FilterFn<S> or(FilterFn<S> fn1,
                 FilterFn<S> fn2)

Accept an entry if at least one of the given filters accept it, using short-circuit evaluation.

Parameters:

fn1 - The first functions to delegate to

fn2 - The second functions to delegate to

Returns:

The composed filter function

or

public static <S> FilterFn<S> or(FilterFn<S>... fns)

Accept an entry if at least one of the given filters accept it, using short-circuit evaluation.

Parameters:

fns - The functions to delegate to (in the given order)

Returns:

The composed filter function

not

public static <S> FilterFn<S> not(FilterFn<S> fn)

Accept an entry if the given filter does not accept it.

Parameters:

fn - The function to delegate to

Returns:

The composed filter function

ACCEPT_ALL

public static <S> FilterFn<S> ACCEPT_ALL()

Accept everything.

Returns:

A filter function that accepts everything.

REJECT_ALL

public static <S> FilterFn<S> REJECT_ALL()

Reject everything.

Returns:

A filter function that rejects everything.