net.shibboleth.utilities.java.support.logic

Class PredicateSupport

java.lang.Object

net.shibboleth.utilities.java.support.logic.PredicateSupport

public final class PredicateSupport
extends Object

Helper class for constructing predicates. Especially useful for creating internal DSLs via Java's static method import mechanism.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	PredicateSupport() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
static <T> com.google.common.base.Predicate<Iterable<T>>	allMatch(com.google.common.base.Predicate<T> target) Creates a predicate that checks that all elements of an Iterable matches a given target predicate.
static <T> com.google.common.base.Predicate<Iterable<T>>	anyMatch(com.google.common.base.Predicate<T> target) Creates a predicate that checks that any element in an Iterable matches a given target predicate.
static com.google.common.base.Predicate<CharSequence>	caseInsensitiveMatch(String target) Creates a predicate that checks if a given CharSequence matches a target string while ignoring case.
static <T> com.google.common.base.Predicate<T>	fromFunction(com.google.common.base.Function<T,Boolean> function, com.google.common.base.Predicate<T> defValue) Creates a predicate that applies a function to an input and returns its result, or a default value if null.

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateSupport

private PredicateSupport()

Constructor.

Method Detail

allMatch

@Nonnull
public static <T> com.google.common.base.Predicate<Iterable<T>> allMatch(@Nonnull
                                                                 com.google.common.base.Predicate<T> target)

Creates a predicate that checks that all elements of an Iterable matches a given target predicate.

Type Parameters:

T - type of objects in the iterable and that the target operates upon

Parameters:

target - predicate used to check each element in the iterable

Returns:

the constructed predicate

anyMatch

@Nonnull
public static <T> com.google.common.base.Predicate<Iterable<T>> anyMatch(@Nonnull
                                                                 com.google.common.base.Predicate<T> target)

Creates a predicate that checks that any element in an Iterable matches a given target predicate.

Type Parameters:

T - type of objects in the iterable and that the target operates upon

Parameters:

target - predicate used to check each element in the iterable

Returns:

the constructed predicate

caseInsensitiveMatch

@Nonnull
public static com.google.common.base.Predicate<CharSequence> caseInsensitiveMatch(@Nonnull
                                                                          String target)

Creates a predicate that checks if a given CharSequence matches a target string while ignoring case.

Parameters:

target - the target string to match against

Returns:

the constructed predicate

fromFunction

@Nonnull
public static <T> com.google.common.base.Predicate<T> fromFunction(@Nonnull
                                                           com.google.common.base.Function<T,Boolean> function,
                                                           @Nonnull
                                                           com.google.common.base.Predicate<T> defValue)

Creates a predicate that applies a function to an input and returns its result, or a default value if null.

Type Parameters:

T - type of function input

Parameters:

function - function to apply to input

defValue - default predicate to apply if function returns null

Returns:

a predicate adapter

Since:

7.4.0