Package com.hazelcast.projection
Class Projections
java.lang.Object
com.hazelcast.projection.Projections
public final class Projections extends Object
A utility class to create basic
Projection
instances.- Since:
- 3.8
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Method Summary
Modifier and Type Method Description static <T> Projection<T,T>
identity()
Returns a projection that does no transformation.static <I> Projection<I,Object[]>
multiAttribute(String... attributePaths)
Returns a projection that extracts the value of the givenattributePaths
.static <I, O> Projection<I,O>
singleAttribute(String attributePath)
Returns a projection that extracts the value of the givenattributePath
.
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Method Details
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identity
Returns a projection that does no transformation.If you use the returned projection in a 3.9 cluster it may cause a serialization exception.
- Type Parameters:
T
- type- Since:
- 3.10
-
singleAttribute
Returns a projection that extracts the value of the givenattributePath
.- Type Parameters:
I
- input typeO
- output type- Parameters:
attributePath
- single attribute path, path must not be null or empty
-
multiAttribute
Returns a projection that extracts the value of the givenattributePaths
. The attribute values will be returned as anObject[]
array from each projection call.- Type Parameters:
I
- input type- Parameters:
attributePaths
- attribute paths, paths must not be null or empty
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