com.cerner.beadledom.guice.dynamicbindings.DynamicAnnotations Maven / Gradle / Ivy
package com.cerner.beadledom.guice.dynamicbindings;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.util.Types;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
/**
* Static convenience methods for creating {@link DynamicBindingProvider} instances.
*
* @author John Leacox
* @see DynamicBindingProvider
* @since 1.2
*/
class DynamicAnnotations {
private DynamicAnnotations() {
}
/**
* Binds a {@link DynamicBindingProvider} for the specified class.
*
* The instance bound to the class can later be retrieved through
* {@link DynamicBindingProvider#get(Class)} given the same annotation provided during binding
* time. This method also 'requires' a binding of {@code clazz} to {@code annotation} to exist.
*
*
This method requires a binder, and must be used from a Guice module that is in the
* configure phase.
*
* @param binder the Guice binder to bind with
* @param clazz the class to create a {@link DynamicBindingProvider} for
* @param annotation the binding annotation that must be bound with the provided class
*/
static void bindDynamicProvider(
Binder binder, Class clazz, Class annotation) {
binder.getProvider(Key.get(clazz, annotation));
ParameterizedType type = Types.newParameterizedType(DynamicBindingProvider.class, clazz);
DynamicBindingProvider provider = new DynamicBindingProviderImpl(TypeLiteral.get(clazz));
@SuppressWarnings("unchecked")
Key> key = (Key>) Key.get(type);
binder.bind(key).toInstance(provider);
}
/**
* Binds a {@link DynamicBindingProvider} for the specified key.
*
* The instance bound to the key can later be retrieved through
* {@link DynamicBindingProvider#get(Class)} given the same annotation provided during binding
* time. This method also 'requires' a binding for {@code key}.
*
*
This method requires a binder, and must be used from a Guice module that is in the
* configure phase.
*
*
Note: The annotation on the key will only be used for required binding checks by Guice.
*
* @param binder the Guice binder to bind with
* @param key the key to create a {@link DynamicBindingProvider} for
*/
static void bindDynamicProvider(Binder binder, Key key) {
binder.getProvider(key);
ParameterizedType type =
Types.newParameterizedType(DynamicBindingProvider.class, key.getTypeLiteral().getType());
@SuppressWarnings("unchecked")
DynamicBindingProvider provider =
new DynamicBindingProviderImpl((TypeLiteral) key.getTypeLiteral());
@SuppressWarnings("unchecked")
Key> dynamicKey = (Key>) Key.get(type);
binder.bind(dynamicKey).toInstance(provider);
}
}