org.springframework.core.DefaultParameterNameDiscoverer Maven / Gradle / Ivy
/*
* Copyright 2002-2015 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 org.springframework.util.ClassUtils;
/**
* Default implementation of the {@link ParameterNameDiscoverer} strategy interface,
* using the Java 8 standard reflection mechanism (if available), and falling back
* to the ASM-based {@link LocalVariableTableParameterNameDiscoverer} for checking
* debug information in the class file.
*
* Further discoverers may be added through {@link #addDiscoverer(ParameterNameDiscoverer)}.
*
* @author Juergen Hoeller
* @since 4.0
* @see StandardReflectionParameterNameDiscoverer
* @see LocalVariableTableParameterNameDiscoverer
*/
public class DefaultParameterNameDiscoverer extends PrioritizedParameterNameDiscoverer {
private static final boolean standardReflectionAvailable = ClassUtils.isPresent(
"java.lang.reflect.Executable", DefaultParameterNameDiscoverer.class.getClassLoader());
public DefaultParameterNameDiscoverer() {
if (standardReflectionAvailable) {
addDiscoverer(new StandardReflectionParameterNameDiscoverer());
}
addDiscoverer(new LocalVariableTableParameterNameDiscoverer());
}
}