org.springframework.core.annotation.IntrospectionFailureLogger Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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.annotation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.lang.Nullable;
/**
* Log facade used to handle annotation introspection failures (in particular
* {@code TypeNotPresentExceptions}). Allows annotation processing to continue,
* assuming that when Class attribute values are not resolvable the annotation
* should effectively disappear.
*
* @author Phillip Webb
* @since 5.2
*/
enum IntrospectionFailureLogger {
DEBUG {
@Override
public boolean isEnabled() {
return getLogger().isDebugEnabled();
}
@Override
public void log(String message) {
getLogger().debug(message);
}
},
INFO {
@Override
public boolean isEnabled() {
return getLogger().isInfoEnabled();
}
@Override
public void log(String message) {
getLogger().info(message);
}
};
@Nullable
private static Log logger;
void log(String message, @Nullable Object source, Exception ex) {
String on = (source != null ? " on " + source : "");
log(message + on + ": " + ex);
}
abstract boolean isEnabled();
abstract void log(String message);
private static Log getLogger() {
Log logger = IntrospectionFailureLogger.logger;
if (logger == null) {
logger = LogFactory.getLog(MergedAnnotation.class);
IntrospectionFailureLogger.logger = logger;
}
return logger;
}
}