Package com.google.common.base
Interface Predicate<T>
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- All Known Implementing Classes:
BloomFilter
,CharMatcher
,PropertyPredicate
,Range
,TypePredicate
,UuidPredicate
@GwtCompatible public interface Predicate<T>
Determines a true or false value for a given input.The
Predicates
class provides common predicates and related utilities.See the Guava User Guide article on the use of
Predicate
.- Since:
- 2.0 (imported from Google Collections Library)
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description boolean
apply(T input)
Returns the result of applying this predicate toinput
.boolean
equals(java.lang.Object object)
Indicates whether another object is equal to this predicate.
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Method Detail
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apply
boolean apply(@Nullable T input)
Returns the result of applying this predicate toinput
. This method is generally expected, but not absolutely required, to have the following properties:- Its execution does not cause any observable side effects.
- The computation is consistent with equals; that is,
Objects.equal
(a, b)
implies thatpredicate.apply(a) == predicate.apply(b))
.
- Throws:
java.lang.NullPointerException
- ifinput
is null and this predicate does not accept null arguments
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equals
boolean equals(@Nullable java.lang.Object object)
Indicates whether another object is equal to this predicate.Most implementations will have no reason to override the behavior of
Object.equals(java.lang.Object)
. However, an implementation may also choose to returntrue
wheneverobject
is aPredicate
that it considers interchangeable with this one. "Interchangeable" typically means thatthis.apply(t) == that.apply(t)
for allt
of typeT
). Note that afalse
result from this method does not imply that the predicates are known not to be interchangeable.- Overrides:
equals
in classjava.lang.Object
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