Class UniquePredicate
java.lang.Object
org.apache.commons.collections.functors.UniquePredicate
- All Implemented Interfaces:
Serializable
,Predicate
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:
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final Set
The set of previously seen objectsprivate static final long
Serial version UID -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
Evaluates the predicate returning true if the input object hasn't been received yet.static Predicate
Factory to create the predicate.
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Field Details
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serialVersionUID
private static final long serialVersionUIDSerial version UID- See Also:
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iSet
The set of previously seen objects
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Constructor Details
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UniquePredicate
public UniquePredicate()Constructor that performs no validation. UsegetInstance
if you want that.
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Method Details
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getInstance
Factory to create the predicate.- Returns:
- the predicate
- Throws:
IllegalArgumentException
- if the predicate is null
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evaluate
Evaluates the predicate returning true if the input object hasn't been received yet.
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