Predicate

org.apache.commons.collections4

Interface Predicate<T>

Type Parameters:

T - the type that the predicate queries

All Known Subinterfaces:

PredicateDecorator<T>

All Known Implementing Classes:

AbstractQuantifierPredicate, AllPredicate, AndPredicate, AnyPredicate, ComparatorPredicate, EqualPredicate, ExceptionPredicate, FalsePredicate, IdentityPredicate, InstanceofPredicate, NonePredicate, NotNullPredicate, NotPredicate, NullIsExceptionPredicate, NullIsFalsePredicate, NullIsTruePredicate, NullPredicate, OnePredicate, OrPredicate, TransformedPredicate, TransformerPredicate, TruePredicate, UniquePredicate
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public interface Predicate<T>
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Defines a functor interface implemented by classes that perform a predicate test on an object.
A Predicate is the object equivalent of an if statement. It uses the input object to return a true or false value, and is often used in validation or filtering.

Standard implementations of common predicates are provided by PredicateUtils. These include true, false, instanceof, equals, and, or, not, method invokation and null testing.

Since:

1.0

Method Summary

All Methods

Instance Methods

Abstract Methods
Modifier and Type	Method and Description
`boolean`	`evaluate(T object)` Use the specified parameter to perform a test that returns true or false.

- Method Detail
  - evaluate
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boolean evaluate(T object)
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    Use the specified parameter to perform a test that returns true or false.
    
    Parameters:
    
    object - the object to evaluate, should not be changed
    
    Returns:
    
    true or false
    
    Throws:
    
    ClassCastException - (runtime) if the input is the wrong class
    
    IllegalArgumentException - (runtime) if the input is invalid
    
    FunctorException - (runtime) if the predicate encounters a problem