/*
* 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;
}
}