1 /** 2 * Copyright (C) 2015 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.inject.daggeradapter; 17 18 import com.google.common.collect.ImmutableSet; 19 import com.google.inject.Binder; 20 import com.google.inject.Key; 21 import com.google.inject.internal.UniqueAnnotations; 22 import com.google.inject.multibindings.Multibinder; 23 import com.google.inject.spi.InjectionPoint; 24 import com.google.inject.spi.ModuleAnnotatedMethodScanner; 25 26 import dagger.Provides; 27 import dagger.Provides.Type; 28 29 import java.lang.annotation.Annotation; 30 import java.lang.reflect.Method; 31 import java.util.Set; 32 33 /** 34 * A scanner to process provider methods on Dagger modules. 35 * 36 * @author cgruber (at) google.com (Christian Gruber) 37 */ 38 final class DaggerMethodScanner extends ModuleAnnotatedMethodScanner { 39 static DaggerMethodScanner INSTANCE = new DaggerMethodScanner(); 40 41 @Override public Set<? extends Class<? extends Annotation>> annotationClasses() { 42 return ImmutableSet.of(dagger.Provides.class); 43 } 44 45 @Override public <T> Key<T> prepareMethod( 46 Binder binder, Annotation rawAnnotation, Key<T> key, InjectionPoint injectionPoint) { 47 Method providesMethod = (Method) injectionPoint.getMember(); 48 Provides annotation = (Provides) rawAnnotation; 49 switch (annotation.type()) { 50 case UNIQUE: 51 return key; 52 case MAP: 53 /* TODO(cgruber) implement map bindings */ 54 binder.addError("Map bindings are not yet supported."); 55 case SET: 56 return processSetBinding(binder, key); 57 case SET_VALUES: 58 binder.addError(Type.SET_VALUES.name() + " contributions are not supported by Guice.", 59 providesMethod); 60 return key; 61 default: 62 binder.addError("Unknown @Provides type " + annotation.type() + ".", providesMethod); 63 return key; 64 } 65 } 66 67 private static <T> Key<T> processSetBinding(Binder binder, Key<T> key) { 68 Multibinder<T> setBinder = Multibinder.newSetBinder(binder, key.getTypeLiteral()); 69 Key<T> newKey = Key.get(key.getTypeLiteral(), UniqueAnnotations.create()); 70 setBinder.addBinding().to(newKey); 71 return newKey; 72 } 73 74 private DaggerMethodScanner() {} 75 }
