Reflect

play.utils.Reflect

object Reflect

Attributes

Lookup the given key from the given configuration, and provide bindings for the ScalaTrait to a class by that key.

The end goal is to provide a binding for ScalaTrait. The logic for finding the implementation goes like this:

If the value of the configured key is provided, this indicates the user will provide their own binding, so return nothing.
If the value of the configured key is a class that exists, then use that
If the value of the configured key is not a class that exists, fail
Otherwise if no configuration value is found for key, then if there is a class found with name defaultClassName, use that
Otherwise, use the class Default

If a class has been located, convert that to a binding, by the following rules:

If it's a subclass of ScalaTrait bind it directly
Otherwise, if it's a subclass of JavaInterface, bind that to JavaInterface, and then also return a binding of JavaAdapter to ScalaTrait
Otherwise, fail

Default: The default implementation of ScalaTrait if no user implementation has been provided
JavaAdapter: An adapter class that depends on JavaInterface and provides ScalaTrait
JavaDelegate: An implementation of JavaInterface that delegates to ScalaTrait, for when the configured class is not an instance of JavaInterface.
JavaInterface: The Java interface for Java versions of the implementation
ScalaTrait: The trait to bind

Lookup the given key from the given configuration, and load it either as an instance of ScalaTrait, or JavaInterface.

If no user provided class can be found, then return Default.

If the value of the configured key is provided, this indicates the user will provide their own binding, so return None.
If the value of the configured key is a class that exists, then use that
If the value of the configured key is not a class that exists, fail
Otherwise if no configuration value is found for key, then if there is a class found with name defaultClassName, use that
Otherwise, use the class Default

If a class has been located, then return Some, according to the following rules:

Default: The default implementation of ScalaTrait if no user implementation has been provided
JavaInterface: The Java interface for Java versions of the implementation
ScalaTrait: The Scala trait to return

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