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/*
* Copyright (C) 2022-2022 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/glacimon
* Email: [email protected]
*/
package com.github.shepherdviolet.glacimon.java.reflect;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.*;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Bean info utils
*
* @author shepherdviolet
*/
public class BeanInfoUtils {
private static final Map, Object> CACHE = new ConcurrentHashMap<>(128);
/**
* Get property info of Java Bean, With cache
*
* @param beanClass Bean class
* @throws IntrospectionException Inspect error
*/
public static Map getPropertyInfos(Class beanClass) throws IntrospectionException {
return getPropertyInfos(beanClass, true);
}
/**
* Get property info of Java Bean
*
* @param beanClass Bean class
* @param cacheEnabled Is cache enabled
* @throws IntrospectionException Inspect error
*/
@SuppressWarnings("unchecked")
public static Map getPropertyInfos(Class beanClass, boolean cacheEnabled) throws IntrospectionException {
if (beanClass == null) {
throw new NullPointerException("beanClass is null");
}
if (!cacheEnabled) {
return getPropertyInfos0(beanClass);
}
Object propertyInfos = CACHE.get(beanClass);
if (propertyInfos == null) {
try {
propertyInfos = getPropertyInfos0(beanClass);
propertyInfos = Collections.unmodifiableMap((Map) propertyInfos);
} catch (IntrospectionException e) {
propertyInfos = e;
}
CACHE.put(beanClass, propertyInfos);
}
if (propertyInfos instanceof IntrospectionException) {
throw (IntrospectionException) propertyInfos;
}
return (Map) propertyInfos;
}
private static Map getPropertyInfos0(Class beanClass) throws IntrospectionException {
BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
Map propertyInfos = new HashMap<>(propertyDescriptors.length << 1);
// Handle properties
for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
// Property type
Class propertyClass = propertyDescriptor.getPropertyType();
Type propertyType;
// Setter / Getter
Method readMethod = propertyDescriptor.getReadMethod();
Method writeMethod = propertyDescriptor.getWriteMethod();
// Fallback
if (propertyClass == null) {
propertyClass = Object.class;
}
// Setter first
if (readMethod != null) {
propertyType = readMethod.getGenericReturnType();
} else {
// writeMethod must exist if readMethod is null
Type[] parameterTypes = writeMethod.getGenericParameterTypes();
// IndexedPropertyDescriptor has 2 parameters, see Introspector
propertyType = parameterTypes[parameterTypes.length - 1];
}
// Get actual type of property
propertyType = getActualType(propertyType, beanClass);
if (propertyType == null) {
propertyType = propertyClass;
}
// Name
String propertyName = propertyDescriptor.getName();
if (propertyName != null) {
propertyName = propertyName.intern();
}
propertyInfos.put(propertyName, new PropertyInfo(
propertyName,
propertyClass,
propertyType,
readMethod,
writeMethod
));
}
return propertyInfos;
}
private static Type getActualType(Type propertyType, Class beanClass) {
if (propertyType == null) {
return null;
}
// If it is a generic array Type (T[]), get the component type (T)
Type componentType = propertyType;
int arrayDepth = 0;
while (componentType instanceof GenericArrayType) {
componentType = ((GenericArrayType) componentType).getGenericComponentType();
arrayDepth++;
}
// If the component type is generic, get the actual type from declaring class
if (componentType instanceof TypeVariable && ((TypeVariable) componentType).getGenericDeclaration() instanceof Class) {
try {
// try to find generic type in class
componentType = GenericClassUtils.getActualTypes(beanClass, (Class) ((TypeVariable) componentType).getGenericDeclaration())
.get(((TypeVariable) componentType).getName());
} catch (GenericClassUtils.TargetGenericClassNotFoundException ignore) {
return null;
}
}
if (componentType instanceof ParameterizedType) {
// Get actual type if type arguments as generic
Type[] actualTypeArguments = ((ParameterizedType) componentType).getActualTypeArguments();
boolean rebuild = false;
for (int i = 0 ; i < actualTypeArguments.length ; i++) {
Type actualTypeArgument = actualTypeArguments[i];
if ((actualTypeArgument instanceof TypeVariable && ((TypeVariable) actualTypeArgument).getGenericDeclaration() instanceof Class) ||
actualTypeArgument instanceof GenericArrayType) {
Type actualType = getActualType(actualTypeArgument, beanClass);
if (actualType != null) {
rebuild = true;
actualTypeArguments[i] = actualType;
}
}
}
// Rebuild ParameterizedType
if (rebuild) {
componentType = Jdk8ParameterizedType.make((Class) (
(ParameterizedType) componentType).getRawType(),
actualTypeArguments,
((ParameterizedType) componentType).getOwnerType());
}
} else if (!(componentType instanceof Class)) {
return null;
}
// If it is not a generic array Type (T[]), return directly
if (arrayDepth <= 0) {
return componentType;
}
// If it is a generic array Type (T[]), rebuild GenericArrayType
for (int i = 0; i < arrayDepth; i++) {
componentType = Jdk8GenericArrayType.make(componentType);
}
return componentType;
}
public static class PropertyInfo {
private final String propertyName;
private final Class propertyClass;
private final Type propertyType;
private final Method readMethod;
private final Method writeMethod;
private PropertyInfo(String propertyName, Class propertyClass, Type propertyType, Method readMethod, Method writeMethod) {
this.propertyName = propertyName;
this.propertyClass = propertyClass;
this.propertyType = propertyType;
this.readMethod = readMethod;
this.writeMethod = writeMethod;
}
/**
* Bean property name, Not null
*/
public String getPropertyName() {
return propertyName;
}
/**
* Class of property, Not null
*/
public Class getPropertyClass() {
return propertyClass;
}
/**
* Generic type of property, Not null, instance of Class / ParameterizedType / GenericArrayType
*/
public Type getPropertyType() {
return propertyType;
}
/**
* Read method, Nullable, But one of the two methods must not be null
*/
public Method getReadMethod() {
return readMethod;
}
/**
* Write method, Nullable, But one of the two methods must not be null
*/
public Method getWriteMethod() {
return writeMethod;
}
@Override
public String toString() {
return "PropertyInfo{" +
"propertyName='" + propertyName + '\'' +
", propertyClass=" + propertyClass +
", propertyType=" + propertyType +
", readMethod=" + readMethod +
", writeMethod=" + writeMethod +
'}';
}
}
}
