Class UniquePredicate
- java.lang.Object
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- org.apache.commons.collections.functors.UniquePredicate
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- All Implemented Interfaces:
java.io.Serializable
,Predicate
public final class UniquePredicate extends java.lang.Object implements Predicate, java.io.Serializable
Predicate implementation that returns true the first time an object is passed into the predicate.- Since:
- Commons Collections 3.0
- Version:
- $Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.util.Set
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(java.lang.Object object)
Evaluates the predicate returning true if the input object hasn't been received yet.static Predicate
getInstance()
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 iSet
The set of previously seen objects
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Method Detail
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getInstance
public static Predicate getInstance()
Factory to create the predicate.- Returns:
- the predicate
- Throws:
java.lang.IllegalArgumentException
- if the predicate is null
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