Class UniquePredicate<T>
- java.lang.Object
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- org.apache.commons.collections4.functors.UniquePredicate<T>
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- All Implemented Interfaces:
java.io.Serializable
,Predicate<T>
public final class UniquePredicate<T> extends java.lang.Object implements Predicate<T>, java.io.Serializable
Predicate implementation that returns true the first time an object is passed into the predicate.- Since:
- 3.0
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.util.Set<T>
iSet
The set of previously seen objectsprivate static long
serialVersionUID
Serial version UID
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Constructor Summary
Constructors Constructor Description UniquePredicate()
Constructor that performs no validation.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
evaluate(T object)
Evaluates the predicate returning true if the input object hasn't been received yet.static <T> Predicate<T>
uniquePredicate()
Factory to create the predicate.
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Field Detail
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serialVersionUID
private static final long serialVersionUID
Serial version UID- See Also:
- Constant Field Values
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iSet
private final java.util.Set<T> iSet
The set of previously seen objects
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Method Detail
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uniquePredicate
public static <T> Predicate<T> uniquePredicate()
Factory to create the predicate.- Type Parameters:
T
- the type that the predicate queries- Returns:
- the predicate
- Throws:
java.lang.IllegalArgumentException
- if the predicate is null
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