org.apache.myfaces.trinidad.util

## Class Service

- java.lang.Object
- - org.apache.myfaces.trinidad.util.Service

-     public class Service
      extends Object

  API for retrieving a service from an object. Services remove the need for a class to directly implement an interface; instead a class can implement the Service.Provider inner interface. This makes it possible to "decorate" another generic class - like RenderKit - without needing to know in advance what optional interfaces the decorated object might implement, or to even switch on and off implementations dynamically. A developer can still choose to directly implement an interface. The `getService(java.lang.Object, java.lang.Class<T>)` method supports both direct implementation and the use of the Service.Provider interface.

  #### Example:

          RenderKit rk = facesContext.getRenderKit();
          // Retrieve the DialogService generically.
          DialogService service = (DialogService)
            ServiceUtils.getService(rk, DialogService.class);

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static interface` | `Service.Provider` Inner interface that should be implemented if a class needs to provide services other than by the default approach.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Service()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static <T> T` | `getRenderKitService(javax.faces.context.FacesContext context, Class<T> serviceClass)` A convenience for retrieving a service from the current RenderKit.
    `static <T> T` | `getService(Object from, Class<T> serviceClass)` Returns a service that can be cast to the provided serviceClass, as vended by the `from` object.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Service

          public Service()

  - ### Method Detail

    - #### getService

          public static <T> T getService(Object from,
                         Class<T> serviceClass)

      Returns a service that can be cast to the provided serviceClass, as vended by the `from` object. If the class implements Provider, its `getService()` method will be used. Otherwise, the default behavior will be to see if `from` is an instance of `serviceClass`, and return it if it is.
      Parameters:
        `from` - the object that is vending the service
        `serviceClass` - the type of object that must be returned
      Returns:
        an object of type `serviceClass`, or null if no such object could be located

    - #### getRenderKitService

          public static <T> T getRenderKitService(javax.faces.context.FacesContext context,
                                  Class<T> serviceClass)

      A convenience for retrieving a service from the current RenderKit.

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