com.github.dennisit.vplus.data.utils.ClassUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2019-2029, Dreamlu 卢春梦 ([email protected] & www.dreamlu.net).
*
* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.gnu.org/licenses/lgpl.html
*
* 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.github.dennisit.vplus.data.utils;
import lombok.experimental.UtilityClass;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.SynthesizingMethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.web.method.HandlerMethod;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* 类工具类
*
* @author L.cm
*/
@UtilityClass
public class ClassUtils extends org.springframework.util.ClassUtils {
private static final ParameterNameDiscoverer PARAMETER_NAME_DISCOVERER = new DefaultParameterNameDiscoverer();
/**
* 获取方法参数信息
*
* @param constructor 构造器
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Constructor constructor, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
return methodParameter;
}
/**
* 获取方法参数信息
*
* @param method 方法
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Method method, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(method, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
return methodParameter;
}
/**
* 获取Annotation
*
* @param method Method
* @param annotationType 注解类
* @param 泛型标记
* @return {Annotation}
*/
@Nullable
public static A getAnnotation(Method method, Class annotationType) {
Class targetClass = method.getDeclaringClass();
// The method may be on an interface, but we need attributes from the target class.
// If the target class is null, the method will be unchanged.
Method specificMethod = ClassUtils.getMostSpecificMethod(method, targetClass);
// If we are dealing with method with generic parameters, find the original method.
specificMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);
// 先找方法，再找方法上的类
A annotation = AnnotatedElementUtils.findMergedAnnotation(specificMethod, annotationType);
if (null != annotation) {
return annotation;
}
// 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
return AnnotatedElementUtils.findMergedAnnotation(specificMethod.getDeclaringClass(), annotationType);
}
/**
* 获取Annotation
*
* @param handlerMethod HandlerMethod
* @param annotationType 注解类
* @param 泛型标记
* @return {Annotation}
*/
@Nullable
public static A getAnnotation(HandlerMethod handlerMethod, Class annotationType) {
// 先找方法，再找方法上的类
A annotation = handlerMethod.getMethodAnnotation(annotationType);
if (null != annotation) {
return annotation;
}
// 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
Class beanType = handlerMethod.getBeanType();
return AnnotatedElementUtils.findMergedAnnotation(beanType, annotationType);
}
}