| /* |
| * Copyright (C) 2014 The Dagger Authors. |
| * |
| * 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 dagger.internal.codegen.validation; |
| |
| import static javax.lang.model.util.ElementFilter.methodsIn; |
| |
| import dagger.MapKey; |
| import dagger.internal.codegen.langmodel.DaggerElements; |
| import java.util.List; |
| import javax.inject.Inject; |
| import javax.lang.model.element.Element; |
| import javax.lang.model.element.ExecutableElement; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.type.TypeKind; |
| |
| /** |
| * A validator for {@link MapKey} annotations. |
| */ |
| // TODO(dpb,gak): Should unwrapped MapKeys be required to have their single member be named "value"? |
| public final class MapKeyValidator { |
| private final DaggerElements elements; |
| |
| @Inject |
| MapKeyValidator(DaggerElements elements) { |
| this.elements = elements; |
| } |
| |
| public ValidationReport<Element> validate(Element element) { |
| ValidationReport.Builder<Element> builder = ValidationReport.about(element); |
| List<ExecutableElement> members = methodsIn(((TypeElement) element).getEnclosedElements()); |
| if (members.isEmpty()) { |
| builder.addError("Map key annotations must have members", element); |
| } else if (element.getAnnotation(MapKey.class).unwrapValue()) { |
| if (members.size() > 1) { |
| builder.addError( |
| "Map key annotations with unwrapped values must have exactly one member", element); |
| } else if (members.get(0).getReturnType().getKind() == TypeKind.ARRAY) { |
| builder.addError("Map key annotations with unwrapped values cannot use arrays", element); |
| } |
| } else if (autoAnnotationIsMissing()) { |
| builder.addError( |
| "@AutoAnnotation is a necessary dependency if @MapKey(unwrapValue = false). Add a " |
| + "dependency on com.google.auto.value:auto-value:<current version>"); |
| } |
| return builder.build(); |
| } |
| |
| private boolean autoAnnotationIsMissing() { |
| return elements.getTypeElement("com.google.auto.value.AutoAnnotation") == null; |
| } |
| } |