com.google.inject.spi.ModuleAnnotatedMethodScanner Maven / Gradle / Ivy
package com.google.inject.spi;
import com.google.inject.Binder;
import com.google.inject.Key;
import java.lang.annotation.Annotation;
import java.util.Set;
/**
* Allows extensions to scan modules for annotated methods and bind those methods
* as providers, similar to {@code @Provides} methods.
*/
public abstract class ModuleAnnotatedMethodScanner {
/**
* Returns the annotations this should scan for. Every method in the module that has one of these
* annotations will create a Provider binding, with the return value of the binding being what's
* provided and the parameters of the method being dependencies of the provider.
*/
public abstract Set> annotationClasses();
/**
* Prepares a method for binding. This {@code key} parameter is the key discovered from looking at
* the binding annotation and return value of the method. Implementations can modify the key to
* instead bind to another key. For example, Multibinder may want to change
* {@code @SetProvides String provideFoo()} to bind into a unique Key within the multibinder
* instead of binding {@code String}.
*
* The injection point and annotation are provided in case the implementation wants to set the
* key based on the property of the annotation or if any additional preparation is needed for any
* of the dependencies. The annotation is guaranteed to be an instance of one the classes returned
* by {@link #annotationClasses}.
*/
public abstract Key prepareMethod(Binder binder, Annotation annotation, Key key,
InjectionPoint injectionPoint);
}