| /* |
| * Copyright 2011 Google Inc. |
| * |
| * 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 com.google.web.bindery.requestfactory.apt; |
| |
| import javax.lang.model.element.Element; |
| import javax.lang.model.element.ElementKind; |
| import javax.lang.model.element.ExecutableElement; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.type.ExecutableType; |
| import javax.lang.model.type.TypeMirror; |
| |
| /** |
| * Scans a RequestFactory declaration for errors. This visitor will call out to |
| * the State object to validate the types that it encounters. |
| */ |
| class RequestFactoryScanner extends ScannerBase<Void> { |
| private TypeElement checkedElement; |
| |
| @Override |
| public Void visitExecutable(ExecutableElement x, State state) { |
| if (shouldIgnore(x, state)) { |
| // Ignore initializers and methods from Object and RequestFactory |
| return null; |
| } |
| if (!x.getParameters().isEmpty()) { |
| state.poison(x, Messages.factoryNoMethodParameters()); |
| } |
| // resolve type parameters, if any |
| ExecutableType xType = viewIn(checkedElement, x, state); |
| TypeMirror returnType = xType.getReturnType(); |
| if (state.types.isAssignable(returnType, state.requestContextType)) { |
| Element returnTypeElement = state.types.asElement(returnType); |
| if (!returnTypeElement.getKind().equals(ElementKind.INTERFACE)) { |
| state.poison(x, Messages.factoryMustReturnInterface(returnTypeElement.getSimpleName())); |
| } else { |
| TypeElement contextElement = (TypeElement) returnTypeElement; |
| state.maybeScanContext(contextElement); |
| state.requireMapping(contextElement); |
| } |
| } else { |
| state.poison(x, Messages.factoryMustBeAssignable(state.requestContextType.asElement() |
| .getSimpleName())); |
| } |
| return null; |
| } |
| |
| @Override |
| public Void visitType(TypeElement x, State state) { |
| // Ignore RequestFactory itself |
| if (state.types.isSameType(state.requestFactoryType, x.asType())) { |
| return null; |
| } |
| |
| checkedElement = x; |
| |
| scanAllInheritedMethods(x, state); |
| state.checkExtraTypes(x); |
| return null; |
| } |
| |
| } |