Interface ObjectProvider

All Known Implementing Classes:
ApplicationMessageCatalogObjectProvider, AssetObjectProvider, AutobuildObjectProvider, EntityManagerObjectProvider, ServiceAnnotationObjectProvider, StaticObjectProvider, SymbolObjectProvider, ValueObjectProvider

public interface ObjectProvider
Object providers represent an alternate way to locate an object provided somewhere in the Registry. Instead of using a just the service id to gain access to a service within the Registry, object providers in different flavors are capable of vending, or even creating, objects of disparate types from disparate sources. Object providers are consulted in a strict order, and the first non-null result is taken. In many cases, an object provider searches for additional annotations on the element (usually a parameter, or perhaps a field) for which a value is required.
  • Method Summary

    Modifier and Type
    Method
    Description
    <T> T
    provide(Class<T> objectType, AnnotationProvider annotationProvider, ObjectLocator locator)
    Provides an object based on an expression.
  • Method Details

    • provide

      <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider, ObjectLocator locator)
      Provides an object based on an expression. The process of providing objects occurs within a particular context, which will typically be a service builder method, service contributor method, or service decorator method. The locator parameter provides access to the services visible to that context.
      Type Parameters:
      T -
      Parameters:
      objectType - the expected object type
      annotationProvider - provides access to annotations (typically, the field or parameter to which an injection-related annotation is attached); annotations on the field or parameter may also be used when resolving the desired object
      locator - locator for the context in which the provider is being used
      Returns:
      the requested object, or null if this object provider can not supply an object
      Throws:
      RuntimeException - if the expression can not be evaluated, or the type of object identified is not assignable to the type specified by the objectType parameter