com.google.inject.daggeradapter.DaggerMethodScanner Maven / Gradle / Ivy
/*
* Copyright (C) 2015 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.inject.daggeradapter;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.internal.UniqueAnnotations;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.ModuleAnnotatedMethodScanner;
import dagger.Provides;
import dagger.Provides.Type;
import dagger.multibindings.ElementsIntoSet;
import dagger.multibindings.IntoMap;
import dagger.multibindings.IntoSet;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Set;
/**
* A scanner to process provider methods on Dagger modules.
*
* @author [email protected] (Christian Gruber)
*/
final class DaggerMethodScanner extends ModuleAnnotatedMethodScanner {
static final DaggerMethodScanner INSTANCE = new DaggerMethodScanner();
private static final ImmutableSet> ANNOTATIONS =
ImmutableSet.of(dagger.Provides.class);
@Override
public Set> annotationClasses() {
return ANNOTATIONS;
}
@Override
public Key prepareMethod(
Binder binder, Annotation rawAnnotation, Key key, InjectionPoint injectionPoint) {
Method providesMethod = (Method) injectionPoint.getMember();
Provides annotation = (Provides) rawAnnotation;
if (providesMethod.isAnnotationPresent(IntoSet.class)) {
return processSetBinding(binder, key);
} else if (providesMethod.isAnnotationPresent(ElementsIntoSet.class)) {
binder.addError("@ElementsIntoSet contributions are not suppored by Guice.", providesMethod);
return key;
} else if (providesMethod.isAnnotationPresent(IntoMap.class)) {
/* TODO(cgruber) implement map bindings */
binder.addError("Map bindings are not yet supported.");
return key;
}
switch (annotation.type()) {
case UNIQUE:
return key;
case SET:
return processSetBinding(binder, key);
case SET_VALUES:
binder.addError(
Type.SET_VALUES.name() + " contributions are not supported by Guice.", providesMethod);
return key;
default:
binder.addError("Unknown @Provides type " + annotation.type() + ".", providesMethod);
return key;
}
}
private static Key processSetBinding(Binder binder, Key key) {
Annotation annotation = key.getAnnotation();
Multibinder setBinder =
(annotation != null)
? Multibinder.newSetBinder(binder, key.getTypeLiteral(), annotation)
: Multibinder.newSetBinder(binder, key.getTypeLiteral());
Key newKey = Key.get(key.getTypeLiteral(), UniqueAnnotations.create());
setBinder.addBinding().to(newKey);
return newKey;
}
private DaggerMethodScanner() {}
}