package com.code2roc.fastface.util;
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import javax.annotation.*;
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import java.lang.annotation.*;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.Collectors;
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public class ReflectUtil {
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/**
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* 通过反射,获得定义Class时声明的父类的范型参数的类型. 如public BookManager extends
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* GenricManager<Book>
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*
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* @param clazz The class to introspect
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* @return the first generic declaration, or <code>Object.class</code> if cannot be determined
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*/
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public static Class getSuperClassGenricType(Class clazz) {
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return getSuperClassGenricType(clazz, 0);
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}
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/**
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* 通过反射,获得定义Class时声明的父类的范型参数的类型. 如public BookManager extends GenricManager<Book>
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*
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* @param clazz clazz The class to introspect
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* @param index the Index of the generic ddeclaration,start from 0.
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*/
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public static Class getSuperClassGenricType(Class clazz, int index) throws IndexOutOfBoundsException {
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Type genType = clazz.getGenericSuperclass();
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if (!(genType instanceof ParameterizedType)) {
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return Object.class;
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}
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Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
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if (index >= params.length || index < 0) {
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return Object.class;
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}
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if (!(params[index] instanceof Class)) {
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return Object.class;
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}
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return (Class) params[index];
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}
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public static boolean checkClassAnnotationPresent(Class<?> classz, Class<?> annotationClazz) {
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boolean flag = false;
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List<Annotation> annotationList = Arrays.asList(classz.getAnnotations());
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if(annotationList.size()>0){
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annotationList = annotationList.stream().filter(annotation-> annotation.annotationType() != Deprecated.class &&
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annotation.annotationType() != SuppressWarnings.class &&
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annotation.annotationType() != Override.class &&
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annotation.annotationType() != PostConstruct.class &&
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annotation.annotationType() != PreDestroy.class &&
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annotation.annotationType() != Resource.class &&
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annotation.annotationType() != Resources.class &&
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annotation.annotationType() != Generated.class &&
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annotation.annotationType() != Target.class &&
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annotation.annotationType() != Retention.class &&
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annotation.annotationType() != Documented.class &&
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annotation.annotationType() != Inherited.class).collect(Collectors.toList());
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if(annotationList.size()>0){
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for (Annotation annotation : annotationList) {
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if (annotation.annotationType() == annotationClazz) {
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flag = true;
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break;
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} else {
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flag = checkClassAnnotationPresent(annotation.annotationType(),annotationClazz);
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}
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}
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}
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}
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return flag;
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}
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public static boolean checkMethodAnnotationPresent(Method method , Class<?> annotationClazz) {
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boolean flag = false;
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List<Annotation> annotationList = Arrays.asList(method.getAnnotations());
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if(annotationList.size()>0){
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annotationList = annotationList.stream().filter(annotation-> annotation.annotationType() != Deprecated.class &&
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annotation.annotationType() != SuppressWarnings.class &&
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annotation.annotationType() != Override.class &&
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annotation.annotationType() != PostConstruct.class &&
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annotation.annotationType() != PreDestroy.class &&
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annotation.annotationType() != Resource.class &&
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annotation.annotationType() != Resources.class &&
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annotation.annotationType() != Generated.class &&
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annotation.annotationType() != Target.class &&
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annotation.annotationType() != Retention.class &&
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annotation.annotationType() != Documented.class &&
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annotation.annotationType() != Inherited.class).collect(Collectors.toList());
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if(annotationList.size()>0){
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for (Annotation annotation : annotationList) {
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if (annotation.annotationType() == annotationClazz) {
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flag = true;
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break;
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} else {
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flag = checkClassAnnotationPresent(annotation.annotationType(),annotationClazz);
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}
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}
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}
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}
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return flag;
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}
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public static Annotation getClassAnnotation(Class<?> classz, Class<?> annotationClazz) {
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Annotation result = null;
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List<Annotation> annotationList = Arrays.asList(classz.getAnnotations());
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if(annotationList.size()>0){
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annotationList = annotationList.stream().filter(annotation-> annotation.annotationType() != Deprecated.class &&
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annotation.annotationType() != SuppressWarnings.class &&
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annotation.annotationType() != Override.class &&
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annotation.annotationType() != PostConstruct.class &&
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annotation.annotationType() != PreDestroy.class &&
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annotation.annotationType() != Resource.class &&
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annotation.annotationType() != Resources.class &&
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annotation.annotationType() != Generated.class &&
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annotation.annotationType() != Target.class &&
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annotation.annotationType() != Retention.class &&
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annotation.annotationType() != Documented.class &&
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annotation.annotationType() != Inherited.class).collect(Collectors.toList());
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if(annotationList.size()>0){
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for (Annotation annotation : annotationList) {
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if (annotation.annotationType() == annotationClazz) {
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result = annotation;
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break;
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} else {
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result = getClassAnnotation(annotation.annotationType(),annotationClazz);
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}
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}
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}
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}
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return result;
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}
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public static Annotation getMethodAnnotation(Method method , Class<?> annotationClazz) {
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Annotation result = null;
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List<Annotation> annotationList = Arrays.asList(method.getAnnotations());
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if(annotationList.size()>0){
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annotationList = annotationList.stream().filter(annotation-> annotation.annotationType() != Deprecated.class &&
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annotation.annotationType() != SuppressWarnings.class &&
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annotation.annotationType() != Override.class &&
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annotation.annotationType() != PostConstruct.class &&
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annotation.annotationType() != PreDestroy.class &&
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annotation.annotationType() != Resource.class &&
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annotation.annotationType() != Resources.class &&
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annotation.annotationType() != Generated.class &&
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annotation.annotationType() != Target.class &&
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annotation.annotationType() != Retention.class &&
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annotation.annotationType() != Documented.class &&
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annotation.annotationType() != Inherited.class).collect(Collectors.toList());
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if(annotationList.size()>0){
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for (Annotation annotation : annotationList) {
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if (annotation.annotationType() == annotationClazz) {
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result = annotation;
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break;
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} else {
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result = getClassAnnotation(annotation.annotationType(),annotationClazz);
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}
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}
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}
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}
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return result;
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}
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public static List<Field> getFieldList(Class clazz){
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List<Field> allFields = new ArrayList<>();
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// 获取当前对象的所有属性字段
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// clazz.getFields()：获取public修饰的字段
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// clazz.getDeclaredFields()： 获取所有的字段包括private修饰的字段
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allFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
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// 获取所有父类的字段， 父类中的字段需要逐级获取
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Class clazzSuper = clazz.getSuperclass();
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// 如果父类不是object，表明其继承的有其他类。 逐级获取所有父类的字段
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while (clazzSuper != Object.class) {
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allFields.addAll(Arrays.asList(clazzSuper.getDeclaredFields()));
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clazzSuper = clazzSuper.getSuperclass();
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}
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return allFields;
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}
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}
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