ProjectionRegistry (Red Hat JBoss Enterprise Application Platform 8.0.0.GA public API)

All Known Implementing Classes:

PojoSearchQueryElementRegistry
```
public interface ProjectionRegistry
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<T> CompositeProjectionDefinition<T>`	`composite(Class<T> objectClass)`
`<T> Optional<CompositeProjectionDefinition<T>>`	`compositeOptional(Class<T> objectClass)`

- Method Detail
  - composite
```
<T> CompositeProjectionDefinition<T> composite(Class<T> objectClass)
```
    Type Parameters:
    
    T - The type of objects returned by the projection.
    
    Parameters:
    
    objectClass - The type of objects returned by the projection. The class is expected to be mapped (generally through annotations) in such a way that it defines the inner projections.
    
    Returns:
    
    A definition of the projection.
    
    Throws:
    
    SearchException - If no projection definition exists for this object class.
  - compositeOptional
```
<T> Optional<CompositeProjectionDefinition<T>> compositeOptional(Class<T> objectClass)
```
    Type Parameters:
    
    T - The type of objects returned by the projection.
    
    Parameters:
    
    objectClass - The type of objects returned by the projection. The class is expected to be mapped (generally through annotations) in such a way that it defines the inner projections.
    
    Returns:
    
    A definition of the projection, or Optional.empty() if no projection definition is available for the given object class.