com.google.web.bindery.requestfactory.apt.ExtraTypesScanner Maven / Gradle / Ivy
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/*
* 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 java.util.List;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
/**
* Looks for {@code ExtraTypes} annotations and calls
* {@link #scanExtraType(TypeElement)}.
*/
abstract class ExtraTypesScanner extends ScannerBase {
/**
* Check an element for a declaration.
*/
protected void checkForAnnotation(Element x, State state) {
// Bug similar to Eclipse 261969 makes ExtraTypes.value() unreliable.
for (AnnotationMirror mirror : x.getAnnotationMirrors()) {
if (!state.types.isSameType(mirror.getAnnotationType(), state.extraTypesAnnotation)) {
continue;
}
// The return of the Class[] value() method
AnnotationValue value = mirror.getElementValues().values().iterator().next();
// which is represented by a list
@SuppressWarnings("unchecked")
List valueList =
(List) value.getValue();
for (AnnotationValue clazz : valueList) {
TypeMirror type = (TypeMirror) clazz.getValue();
scanExtraType((TypeElement) state.types.asElement(type));
}
}
}
/**
* Check a type and all of its supertypes for the annotation.
*/
protected void checkForAnnotation(TypeElement x, State state) {
// Check type's declaration
checkForAnnotation((Element) x, state);
// Look at superclass, if it exists
if (!x.getSuperclass().getKind().equals(TypeKind.NONE)) {
checkForAnnotation((TypeElement) state.types.asElement(x.getSuperclass()), state);
}
// Check super-interfaces
for (TypeMirror intf : x.getInterfaces()) {
checkForAnnotation((TypeElement) state.types.asElement(intf), state);
}
}
protected abstract void scanExtraType(TypeElement extraType);
}