1 /* 2 * Copyright (C) 2014 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 dagger.internal.codegen; 17 18 import com.google.auto.common.AnnotationMirrors; 19 import com.google.common.base.Optional; 20 import com.google.common.collect.ImmutableSet; 21 import javax.inject.Qualifier; 22 import javax.inject.Scope; 23 import javax.lang.model.element.AnnotationMirror; 24 import javax.lang.model.element.Element; 25 26 import static com.google.common.base.Preconditions.checkNotNull; 27 28 /** 29 * Utilities relating to annotations defined in the {@code javax.inject} package. 30 * 31 * @author Gregory Kick 32 * @since 2.0 33 */ 34 final class InjectionAnnotations { 35 static Optional<AnnotationMirror> getScopeAnnotation(Element e) { 36 checkNotNull(e); 37 ImmutableSet<? extends AnnotationMirror> scopeAnnotations = getScopes(e); 38 switch (scopeAnnotations.size()) { 39 case 0: 40 return Optional.absent(); 41 case 1: 42 return Optional.<AnnotationMirror>of(scopeAnnotations.iterator().next()); 43 default: 44 throw new IllegalArgumentException( 45 e + " was annotated with more than one @Scope annotation"); 46 } 47 } 48 49 static Optional<AnnotationMirror> getQualifier(Element e) { 50 checkNotNull(e); 51 ImmutableSet<? extends AnnotationMirror> qualifierAnnotations = getQualifiers(e); 52 switch (qualifierAnnotations.size()) { 53 case 0: 54 return Optional.absent(); 55 case 1: 56 return Optional.<AnnotationMirror>of(qualifierAnnotations.iterator().next()); 57 default: 58 throw new IllegalArgumentException( 59 e + " was annotated with more than one @Qualifier annotation"); 60 } 61 } 62 63 static ImmutableSet<? extends AnnotationMirror> getQualifiers(Element element) { 64 return AnnotationMirrors.getAnnotatedAnnotations(element, Qualifier.class); 65 } 66 67 static ImmutableSet<? extends AnnotationMirror> getScopes(Element element) { 68 return AnnotationMirrors.getAnnotatedAnnotations(element, Scope.class); 69 } 70 71 private InjectionAnnotations() {} 72 } 73
