1 /*
2  * Copyright (C) 2017 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.android.processor;
18 
19 import static com.google.auto.common.AnnotationMirrors.getAnnotationValue;
20 
21 import com.google.auto.common.MoreTypes;
22 import dagger.android.AndroidInjectionKey;
23 import java.util.Optional;
24 import javax.lang.model.element.AnnotationMirror;
25 import javax.lang.model.element.TypeElement;
26 import javax.lang.model.type.TypeMirror;
27 
28 final class AndroidMapKeys {
29   /**
30    * If {@code mapKey} is {@link AndroidInjectionKey}, returns the string value for the map key. If
31    * it's {@link dagger.multibindings.ClassKey}, returns the fully-qualified class name of the
32    * annotation value. Otherwise returns {@link Optional#empty()}.
33    */
injectedTypeFromMapKey(AnnotationMirror mapKey)34   static Optional<String> injectedTypeFromMapKey(AnnotationMirror mapKey) {
35     Object mapKeyClass = getAnnotationValue(mapKey, "value").getValue();
36     if (mapKeyClass instanceof String) {
37       return Optional.of((String) mapKeyClass);
38     } else if (mapKeyClass instanceof TypeMirror) {
39       TypeElement type = MoreTypes.asTypeElement((TypeMirror) mapKeyClass);
40       return Optional.of(type.getQualifiedName().toString());
41     } else {
42       return Optional.empty();
43     }
44   }
45 }
46