FindUsageAspectDescriptor (MPS.Core (JetBrains MPS 2019.1.0))

All Superinterfaces:

ILanguageAspect

All Known Implementing Classes:

BaseFindUsagesDescriptor
```
public interface FindUsageAspectDescriptor
extends ILanguageAspect
```
Aspect interface to provide usage finders for a language. Generated code shall subclass BaseFindUsagesDescriptor instead of implementing this interface directly to support future changes.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`init(FinderRegistry registry)`
`IInterfacedFinder`	`instantiate(int token)`	Instantiate a finder registered earlier in `init(FinderRegistry)`.

- Method Detail
  - init
```
default void init(FinderRegistry registry)
```
  - instantiate
```
IInterfacedFinder instantiate(int token)
                       throws IllegalArgumentException
```
    Instantiate a finder registered earlier in init(FinderRegistry).
    
    Parameters:
    
    token - value manifested through FinderRegistry.add(SAbstractConcept, int)
    
    Returns:
    
    Instance of a finder identified by token, never null. Generally the instance shall be new for each request, unless implementation deals with concurrent execution itself. Intentionally no @NotNull on return value - switch with returns get != null check for each case
    
    Throws:
    
    IllegalArgumentException - if token is not the one this aspect had manifested through FinderRegistry.add(SAbstractConcept, int)