Projections (Hazelcast Root 5.4.0-SNAPSHOT API)

java.lang.Object
- com.hazelcast.projection.Projections

```
public final class Projections
extends java.lang.Object
```
A utility class to create basic Projection instances.

Since:

3.8

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> Projection<T,T>`	`identity()`	Returns a projection that does no transformation.
`static <I> Projection<I,java.lang.Object[]>`	`multiAttribute(java.lang.String... attributePaths)`	Returns a projection that extracts the value of the given `attributePaths`.
`static <I,O> Projection<I,O>`	`singleAttribute(java.lang.String attributePath)`	Returns a projection that extracts the value of the given `attributePath`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - identity
```
public static <T> Projection<T,T> 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
```
public static <I,O> Projection<I,O> singleAttribute(java.lang.String attributePath)
```
    Returns a projection that extracts the value of the given attributePath.
    
    Type Parameters:
    
    I - input type
    
    O - output type
    
    Parameters:
    
    attributePath - single attribute path, path must not be null or empty
  - multiAttribute
```
public static <I> Projection<I,java.lang.Object[]> multiAttribute(java.lang.String... attributePaths)
```
    Returns a projection that extracts the value of the given attributePaths. The attribute values will be returned as an Object[] array from each projection call.
    
    Type Parameters:
    
    I - input type
    
    Parameters:
    
    attributePaths - attribute paths, paths must not be null or empty