/*
* Copyright 2002-2020 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;
Default implementation of the ParameterNameDiscoverer
strategy interface, using the Java 8 standard reflection mechanism (if available), and falling back to the ASM-based LocalVariableTableParameterNameDiscoverer
for checking debug information in the class file. If a Kotlin reflection implementation is present, KotlinReflectionParameterNameDiscoverer
is added first in the list and used for Kotlin classes and interfaces. When compiling or running as a GraalVM native image, the KotlinReflectionParameterNameDiscoverer
is not used.
Further discoverers may be added through PrioritizedParameterNameDiscoverer.addDiscoverer(ParameterNameDiscoverer)
.
Author: Juergen Hoeller, Sebastien Deleuze, Sam Brannen See Also: Since: 4.0
/**
* 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.
*
* <p>If a Kotlin reflection implementation is present,
* {@link KotlinReflectionParameterNameDiscoverer} is added first in the list and
* used for Kotlin classes and interfaces. When compiling or running as a GraalVM
* native image, the {@code KotlinReflectionParameterNameDiscoverer} is not used.
*
* <p>Further discoverers may be added through {@link #addDiscoverer(ParameterNameDiscoverer)}.
*
* @author Juergen Hoeller
* @author Sebastien Deleuze
* @author Sam Brannen
* @since 4.0
* @see StandardReflectionParameterNameDiscoverer
* @see LocalVariableTableParameterNameDiscoverer
* @see KotlinReflectionParameterNameDiscoverer
*/
public class DefaultParameterNameDiscoverer extends PrioritizedParameterNameDiscoverer {
Whether this environment lives within a native image. Exposed as a private static field rather than in a NativeImageDetector.inNativeImage()
static method due to https://github.com/oracle/graal/issues/2594. See Also:
/**
* Whether this environment lives within a native image.
* Exposed as a private static field rather than in a {@code NativeImageDetector.inNativeImage()} static method due to https://github.com/oracle/graal/issues/2594.
* @see <a href="https://github.com/oracle/graal/blob/master/sdk/src/org.graalvm.nativeimage/src/org/graalvm/nativeimage/ImageInfo.java">ImageInfo.java</a>
*/
private static final boolean IN_NATIVE_IMAGE = (System.getProperty("org.graalvm.nativeimage.imagecode") != null);
public DefaultParameterNameDiscoverer() {
if (KotlinDetector.isKotlinReflectPresent() && !IN_NATIVE_IMAGE) {
addDiscoverer(new KotlinReflectionParameterNameDiscoverer());
}
addDiscoverer(new StandardReflectionParameterNameDiscoverer());
addDiscoverer(new LocalVariableTableParameterNameDiscoverer());
}
}