1 /* 2 * Copyright (C) 2016 The Dagger Authors. 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 17 package dagger.internal.codegen.writing; 18 19 import androidx.room.compiler.processing.XFiler; 20 import androidx.room.compiler.processing.XProcessingEnv; 21 import androidx.room.compiler.processing.XTypeElement; 22 import dagger.MapKey; 23 import java.util.Set; 24 import javax.inject.Inject; 25 26 /** 27 * Generates classes that create annotation instances for an unwrapped {@link MapKey} annotation 28 * type whose nested value is an annotation. The generated class will have a private empty 29 * constructor and a static method that creates each annotation type that is nested in the top-level 30 * annotation type. 31 * 32 * <p>So for an example {@link MapKey} annotation: 33 * 34 * <pre> 35 * {@literal @MapKey}(unwrapValue = true) 36 * {@literal @interface} Foo { 37 * Bar bar(); 38 * } 39 * 40 * {@literal @interface} Bar { 41 * {@literal Class<?> baz();} 42 * } 43 * </pre> 44 * 45 * the generated class will look like: 46 * 47 * <pre> 48 * public final class FooCreator { 49 * private FooCreator() {} 50 * 51 * public static Bar createBar({@literal Class<?> baz}) { … } 52 * } 53 * </pre> 54 */ 55 public final class UnwrappedMapKeyGenerator extends AnnotationCreatorGenerator { 56 57 @Inject UnwrappedMapKeyGenerator(XFiler filer, XProcessingEnv processingEnv)58 UnwrappedMapKeyGenerator(XFiler filer, XProcessingEnv processingEnv) { 59 super(filer, processingEnv); 60 } 61 62 @Override annotationsToCreate(XTypeElement annotationElement)63 protected Set<XTypeElement> annotationsToCreate(XTypeElement annotationElement) { 64 Set<XTypeElement> nestedAnnotationElements = super.annotationsToCreate(annotationElement); 65 nestedAnnotationElements.remove(annotationElement); 66 return nestedAnnotationElements; 67 } 68 } 69