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TypeHelper.java
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TypeHelper.java
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/*
* Copyright 2002-2021 the original author or 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
*
* https://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 org.springframework.context.index.processor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.QualifiedNameable;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Types;
/**
* Type utilities.
*
* @author Stephane Nicoll
* @since 5.0
*/
class TypeHelper {
private final ProcessingEnvironment env;
private final Types types;
public TypeHelper(ProcessingEnvironment env) {
this.env = env;
this.types = env.getTypeUtils();
}
public String getType(Element element) {
return getType(element != null ? element.asType() : null);
}
public String getType(AnnotationMirror annotation) {
return getType(annotation != null ? annotation.getAnnotationType() : null);
}
public String getType(TypeMirror type) {
if (type == null) {
return null;
}
if (type instanceof DeclaredType declaredType) {
Element enclosingElement = declaredType.asElement().getEnclosingElement();
if (enclosingElement instanceof TypeElement) {
return getQualifiedName(enclosingElement) + "$" + declaredType.asElement().getSimpleName().toString();
}
else {
return getQualifiedName(declaredType.asElement());
}
}
return type.toString();
}
private String getQualifiedName(Element element) {
if (element instanceof QualifiedNameable) {
return ((QualifiedNameable) element).getQualifiedName().toString();
}
return element.toString();
}
/**
* Return the superclass of the specified {@link Element} or null if this
* {@code element} represents {@link Object}.
*/
public Element getSuperClass(Element element) {
List<? extends TypeMirror> superTypes = this.types.directSupertypes(element.asType());
if (superTypes.isEmpty()) {
return null; // reached java.lang.Object
}
return this.types.asElement(superTypes.get(0));
}
/**
* Return the interfaces that are <strong>directly</strong> implemented by the
* specified {@link Element} or an empty list if this {@code element} does not
* implement any interface.
*/
public List<Element> getDirectInterfaces(Element element) {
List<? extends TypeMirror> superTypes = this.types.directSupertypes(element.asType());
List<Element> directInterfaces = new ArrayList<>();
if (superTypes.size() > 1) { // index 0 is the superclass
for (int i = 1; i < superTypes.size(); i++) {
Element e = this.types.asElement(superTypes.get(i));
if (e != null) {
directInterfaces.add(e);
}
}
}
return directInterfaces;
}
public List<? extends AnnotationMirror> getAllAnnotationMirrors(Element e) {
try {
return this.env.getElementUtils().getAllAnnotationMirrors(e);
}
catch (Exception ex) {
// This may fail if one of the annotations is not available.
return Collections.emptyList();
}
}
}