spring ParameterNameDiscoverer 源码
spring ParameterNameDiscoverer 代码
文件路径：/spring-core/src/main/java/org/springframework/core/ParameterNameDiscoverer.java
/*
* Copyright 2002-2018 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.core;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.springframework.lang.Nullable;
/**
* Interface to discover parameter names for methods and constructors.
*
* <p>Parameter name discovery is not always possible, but various strategies are
* available to try, such as looking for debug information that may have been
* emitted at compile time, and looking for argname annotation values optionally
* accompanying AspectJ annotated methods.
*
* @author Rod Johnson
* @author Adrian Colyer
* @since 2.0
*/
public interface ParameterNameDiscoverer {
/**
* Return parameter names for a method, or {@code null} if they cannot be determined.
* <p>Individual entries in the array may be {@code null} if parameter names are only
* available for some parameters of the given method but not for others. However,
* it is recommended to use stub parameter names instead wherever feasible.
* @param method the method to find parameter names for
* @return an array of parameter names if the names can be resolved,
* or {@code null} if they cannot
*/
@Nullable
String[] getParameterNames(Method method);
/**
* Return parameter names for a constructor, or {@code null} if they cannot be determined.
* <p>Individual entries in the array may be {@code null} if parameter names are only
* available for some parameters of the given constructor but not for others. However,
* it is recommended to use stub parameter names instead wherever feasible.
* @param ctor the constructor to find parameter names for
* @return an array of parameter names if the names can be resolved,
* or {@code null} if they cannot
*/
@Nullable
String[] getParameterNames(Constructor<?> ctor);
}
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