/
PropertyDescriptor.java
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/
PropertyDescriptor.java
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/*
* Copyright 2012-2022 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.boot.configurationprocessor;
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.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import org.springframework.boot.configurationprocessor.metadata.ConfigurationMetadata;
import org.springframework.boot.configurationprocessor.metadata.ItemDeprecation;
import org.springframework.boot.configurationprocessor.metadata.ItemMetadata;
/**
* Description of a property that can be candidate for metadata generation.
*
* @param <S> the type of the source element that determines the property
* @author Stephane Nicoll
*/
abstract class PropertyDescriptor<S extends Element> {
private final TypeElement ownerElement;
private final ExecutableElement factoryMethod;
private final S source;
private final String name;
private final TypeMirror type;
private final VariableElement field;
private final ExecutableElement getter;
private final ExecutableElement setter;
protected PropertyDescriptor(TypeElement ownerElement, ExecutableElement factoryMethod, S source, String name,
TypeMirror type, VariableElement field, ExecutableElement getter, ExecutableElement setter) {
this.ownerElement = ownerElement;
this.factoryMethod = factoryMethod;
this.source = source;
this.name = name;
this.type = type;
this.field = field;
this.getter = getter;
this.setter = setter;
}
TypeElement getOwnerElement() {
return this.ownerElement;
}
ExecutableElement getFactoryMethod() {
return this.factoryMethod;
}
S getSource() {
return this.source;
}
String getName() {
return this.name;
}
TypeMirror getType() {
return this.type;
}
VariableElement getField() {
return this.field;
}
ExecutableElement getGetter() {
return this.getter;
}
ExecutableElement getSetter() {
return this.setter;
}
protected abstract boolean isProperty(MetadataGenerationEnvironment environment);
protected abstract Object resolveDefaultValue(MetadataGenerationEnvironment environment);
protected ItemDeprecation resolveItemDeprecation(MetadataGenerationEnvironment environment) {
boolean deprecated = environment.isDeprecated(getGetter()) || environment.isDeprecated(getSetter())
|| environment.isDeprecated(getField()) || environment.isDeprecated(getFactoryMethod());
return deprecated ? environment.resolveItemDeprecation(getGetter()) : null;
}
protected boolean isNested(MetadataGenerationEnvironment environment) {
Element typeElement = environment.getTypeUtils().asElement(getType());
if (!(typeElement instanceof TypeElement) || typeElement.getKind() == ElementKind.ENUM) {
return false;
}
if (environment.getConfigurationPropertiesAnnotation(getGetter()) != null) {
return false;
}
if (environment.getNestedConfigurationPropertyAnnotation(getField()) != null) {
return true;
}
if (isCyclePresent(typeElement, getOwnerElement())) {
return false;
}
return isParentTheSame(environment, typeElement, getOwnerElement());
}
ItemMetadata resolveItemMetadata(String prefix, MetadataGenerationEnvironment environment) {
if (isNested(environment)) {
return resolveItemMetadataGroup(prefix, environment);
}
else if (isProperty(environment)) {
return resolveItemMetadataProperty(prefix, environment);
}
return null;
}
private ItemMetadata resolveItemMetadataProperty(String prefix, MetadataGenerationEnvironment environment) {
String dataType = resolveType(environment);
String ownerType = environment.getTypeUtils().getQualifiedName(getOwnerElement());
String description = resolveDescription(environment);
Object defaultValue = resolveDefaultValue(environment);
ItemDeprecation deprecation = resolveItemDeprecation(environment);
return ItemMetadata.newProperty(prefix, getName(), dataType, ownerType, null, description, defaultValue,
deprecation);
}
private ItemMetadata resolveItemMetadataGroup(String prefix, MetadataGenerationEnvironment environment) {
Element propertyElement = environment.getTypeUtils().asElement(getType());
String nestedPrefix = ConfigurationMetadata.nestedPrefix(prefix, getName());
String dataType = environment.getTypeUtils().getQualifiedName(propertyElement);
String ownerType = environment.getTypeUtils().getQualifiedName(getOwnerElement());
String sourceMethod = (getGetter() != null) ? getGetter().toString() : null;
return ItemMetadata.newGroup(nestedPrefix, dataType, ownerType, sourceMethod);
}
private String resolveType(MetadataGenerationEnvironment environment) {
return environment.getTypeUtils().getType(getOwnerElement(), getType());
}
private String resolveDescription(MetadataGenerationEnvironment environment) {
return environment.getTypeUtils().getJavaDoc(getField());
}
private boolean isCyclePresent(Element returnType, Element element) {
if (!(element.getEnclosingElement() instanceof TypeElement)) {
return false;
}
if (element.getEnclosingElement().equals(returnType)) {
return true;
}
return isCyclePresent(returnType, element.getEnclosingElement());
}
private boolean isParentTheSame(MetadataGenerationEnvironment environment, Element returnType,
TypeElement element) {
if (returnType == null || element == null) {
return false;
}
returnType = getTopLevelType(returnType);
Element candidate = element;
while (candidate != null && candidate instanceof TypeElement) {
if (returnType.equals(getTopLevelType(candidate))) {
return true;
}
candidate = environment.getTypeUtils().asElement(((TypeElement) candidate).getSuperclass());
}
return false;
}
private Element getTopLevelType(Element element) {
if (!(element.getEnclosingElement() instanceof TypeElement)) {
return element;
}
return getTopLevelType(element.getEnclosingElement());
}
}