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 dagger.MapKey; 19 import java.util.List; 20 import javax.lang.model.element.Element; 21 import javax.lang.model.element.ExecutableElement; 22 import javax.lang.model.element.TypeElement; 23 import javax.lang.model.type.TypeKind; 24 25 import static dagger.internal.codegen.ErrorMessages.MAPKEY_WITHOUT_MEMBERS; 26 import static dagger.internal.codegen.ErrorMessages.UNWRAPPED_MAP_KEY_WITH_ARRAY_MEMBER; 27 import static dagger.internal.codegen.ErrorMessages.UNWRAPPED_MAP_KEY_WITH_TOO_MANY_MEMBERS; 28 import static javax.lang.model.util.ElementFilter.methodsIn; 29 30 /** 31 * A validator for {@link MapKey} annotations. 32 * 33 * @author Chenying Hou 34 * @since 2.0 35 */ 36 // TODO(dpb,gak): Should unwrapped MapKeys be required to have their single member be named "value"? 37 final class MapKeyValidator { 38 ValidationReport<Element> validate(Element element) { 39 ValidationReport.Builder<Element> builder = ValidationReport.about(element); 40 List<ExecutableElement> members = methodsIn(((TypeElement) element).getEnclosedElements()); 41 if (members.isEmpty()) { 42 builder.addError(MAPKEY_WITHOUT_MEMBERS, element); 43 } else if (element.getAnnotation(MapKey.class).unwrapValue()) { 44 if (members.size() > 1) { 45 builder.addError(UNWRAPPED_MAP_KEY_WITH_TOO_MANY_MEMBERS, element); 46 } else if (members.get(0).getReturnType().getKind() == TypeKind.ARRAY) { 47 builder.addError(UNWRAPPED_MAP_KEY_WITH_ARRAY_MEMBER, element); 48 } 49 } 50 return builder.build(); 51 } 52 } 53
