Package com.google.mu.collect

Class MoreCollections

java.lang.Object

com.google.mu.collect.MoreCollections

public final class MoreCollections
extends Object

Utilities pertaining to Collection.

Since:

8.0

Method Summary

Modifier and Type	Method	Description
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom3<? super T,? extends R> found)	If collection has at least 3 elements, passes the first 3 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom4<? super T,? extends R> found)	If collection has at least 4 elements, passes the first 4 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom5<? super T,? extends R> found)	If collection has at least 5 elements, passes the first 5 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom6<? super T,? extends R> found)	If collection has at least 6 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom7<? super T,? extends R> found)	If collection has at least 7 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, MapFrom8<? super T,? extends R> found)	If collection has at least 8 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findFirstElements(Collection<T> collection, BiFunction<? super T,? super T,? extends R> found)	If collection has at least two elements, passes the first two elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom3<? super T,? extends R> found)	If collection has exactly 3 elements, passes the 3 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom4<? super T,? extends R> found)	If collection has exactly 4 elements, passes the 4 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom5<? super T,? extends R> found)	If collection has exactly 5 elements, passes the 5 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom6<? super T,? extends R> found)	If collection has exactly 6 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom7<? super T,? extends R> found)	If collection has exactly 7 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, MapFrom8<? super T,? extends R> found)	If collection has exactly 8 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().
static <T, R> Optional<R>	findOnlyElements(Collection<T> collection, BiFunction<? super T,? super T,? extends R> found)	If collection has exactly two elements, passes the two elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Methods inherited from class java.lang.Object

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

Method Details

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 BiFunction<? super T,? super T,? extends R> found)

If collection has at least two elements, passes the first two elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom3<? super T,? extends R> found)

If collection has at least 3 elements, passes the first 3 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom4<? super T,? extends R> found)

If collection has at least 4 elements, passes the first 4 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom5<? super T,? extends R> found)

If collection has at least 5 elements, passes the first 5 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom6<? super T,? extends R> found)

If collection has at least 6 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom7<? super T,? extends R> found)

If collection has at least 7 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

Since:

7.2

findFirstElements

public static <T,
R> Optional<R> findFirstElements(Collection<T> collection,
 MapFrom8<? super T,? extends R> found)

If collection has at least 8 elements, passes the first 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

Since:

7.2

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 BiFunction<? super T,? super T,? extends R> found)

If collection has exactly two elements, passes the two elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom3<? super T,? extends R> found)

If collection has exactly 3 elements, passes the 3 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom4<? super T,? extends R> found)

If collection has exactly 4 elements, passes the 4 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom5<? super T,? extends R> found)

If collection has exactly 5 elements, passes the 5 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom6<? super T,? extends R> found)

If collection has exactly 6 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom7<? super T,? extends R> found)

If collection has exactly 7 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

Since:

7.2

findOnlyElements

public static <T,
R> Optional<R> findOnlyElements(Collection<T> collection,
 MapFrom8<? super T,? extends R> found)

If collection has exactly 8 elements, passes the 6 elements to found function and returns the non-null result wrapped in an Optional, or else returns Optional.empty().

Throws:

NullPointerException - if collection or found function is null, or if found function returns null.

Since:

7.2