001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.core;
018
019import java.lang.reflect.Constructor;
020import java.lang.reflect.Method;
021
022/**
023 * Interface to discover parameter names for methods and constructors.
024 *
025 * <p>Parameter name discovery is not always possible, but various strategies are
026 * available to try, such as looking for debug information that may have been
027 * emitted at compile time, and looking for argname annotation values optionally
028 * accompanying AspectJ annotated methods.
029 *
030 * @author Rod Johnson
031 * @author Adrian Colyer
032 * @since 2.0
033 */
034public interface ParameterNameDiscoverer {
035
036        /**
037         * Return parameter names for this method,
038         * or {@code null} if they cannot be determined.
039         * @param method method to find parameter names for
040         * @return an array of parameter names if the names can be resolved,
041         * or {@code null} if they cannot
042         */
043        String[] getParameterNames(Method method);
044
045        /**
046         * Return parameter names for this constructor,
047         * or {@code null} if they cannot be determined.
048         * @param ctor constructor to find parameter names for
049         * @return an array of parameter names if the names can be resolved,
050         * or {@code null} if they cannot
051         */
052        String[] getParameterNames(Constructor<?> ctor);
053
054}