eu.lindenbaum.maven.util
Class CollectionUtils

java.lang.Object
  eu.lindenbaum.maven.util.CollectionUtils

public final class CollectionUtils
extends Object

Containing utilities related to collections.

Since:

2.1.0

Author:

Tobias Schlager , Timo Koepke

Nested Class Summary

static interface	CollectionUtils.FoldFunction<A,B> Function that returns a value of type B for an argument of type A and an accumulator argument of type B.
static interface	CollectionUtils.MapFunction<A,B> Function that returns a value of type B for an argument of type A.

Constructor Summary

CollectionUtils()

Method Summary

static <A> Collection<A>	filter(Predicate<A> p, Collection<A> as) Returns the Collection of elements satisfying a given predicate.
static <A,B> B	foldl(CollectionUtils.FoldFunction<A,B> f, B initial, Collection<A> as) Applies a function f on each element of a collection passing through an accumulator argument which is an argument for the call to f.
static <A,B> Collection<B>	map(CollectionUtils.MapFunction<A,B> f, Collection<A> as) Maps a collection with elements of type A to a collection of type B, where the resulting elements are generated by applying the function f to each element of the given collection.
static <B> Collection<B>	map(CollectionUtils.MapFunction<com.ericsson.otp.erlang.OtpErlangObject,B> f, com.ericsson.otp.erlang.OtpErlangList as) Maps an OtpErlangList with elements of type OtpErlangObject to a collection of type B, where the resulting elements are generated by applying the function f to each element of the given collection.

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

map

public static <A,B> Collection<B> map(CollectionUtils.MapFunction<A,B> f,
                                      Collection<A> as)

Maps a collection with elements of type A to a collection of type B, where the resulting elements are generated by applying the function f to each element of the given collection. The input collection is not modified.

Parameters:

f - the function for generating elements

as - the original collection

Returns:

the generated collection

map

public static <B> Collection<B> map(CollectionUtils.MapFunction<com.ericsson.otp.erlang.OtpErlangObject,B> f,
                                    com.ericsson.otp.erlang.OtpErlangList as)

Maps an OtpErlangList with elements of type OtpErlangObject to a collection of type B, where the resulting elements are generated by applying the function f to each element of the given collection.

Parameters:

f - the function for generating elements

as - the original list

Returns:

the generated collection

filter

public static <A> Collection<A> filter(Predicate<A> p,
                                       Collection<A> as)

Returns the Collection of elements satisfying a given predicate. The input collection is not modified.

Parameters:

p - the predicate for testing elements

as - the original collection

Returns:

the filtered collection

foldl

public static <A,B> B foldl(CollectionUtils.FoldFunction<A,B> f,
                            B initial,
                            Collection<A> as)

Applies a function f on each element of a collection passing through an accumulator argument which is an argument for the call to f.

Parameters:

f - the function generating results

initial - the start argument for the fold operation

as - the collection to iterate

Returns:

the accumulator as returned by the last call to f