/
CompositeLog.java
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/
CompositeLog.java
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/*
* Copyright 2002-2022 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.log;
import java.util.List;
import java.util.function.Predicate;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.NoOpLog;
/**
* Implementation of {@link Log} that wraps a list of loggers and delegates
* to the first one for which logging is enabled at the given level.
*
* @author Rossen Stoyanchev
* @since 5.1
* @see LogDelegateFactory#getCompositeLog
*/
final class CompositeLog implements Log {
private static final Log NO_OP_LOG = new NoOpLog();
private final List<Log> loggers;
/**
* Package-private constructor with list of loggers.
* @param loggers the loggers to use
*/
CompositeLog(List<Log> loggers) {
this.loggers = loggers;
}
@Override
public boolean isFatalEnabled() {
return isEnabled(Log::isFatalEnabled);
}
@Override
public boolean isErrorEnabled() {
return isEnabled(Log::isErrorEnabled);
}
@Override
public boolean isWarnEnabled() {
return isEnabled(Log::isWarnEnabled);
}
@Override
public boolean isInfoEnabled() {
return isEnabled(Log::isInfoEnabled);
}
@Override
public boolean isDebugEnabled() {
return isEnabled(Log::isDebugEnabled);
}
@Override
public boolean isTraceEnabled() {
return isEnabled(Log::isTraceEnabled);
}
private boolean isEnabled(Predicate<Log> predicate) {
return (getLogger(predicate) != NO_OP_LOG);
}
@Override
public void fatal(Object message) {
getLogger(Log::isFatalEnabled).fatal(message);
}
@Override
public void fatal(Object message, Throwable ex) {
getLogger(Log::isFatalEnabled).fatal(message, ex);
}
@Override
public void error(Object message) {
getLogger(Log::isErrorEnabled).error(message);
}
@Override
public void error(Object message, Throwable ex) {
getLogger(Log::isErrorEnabled).error(message, ex);
}
@Override
public void warn(Object message) {
getLogger(Log::isWarnEnabled).warn(message);
}
@Override
public void warn(Object message, Throwable ex) {
getLogger(Log::isWarnEnabled).warn(message, ex);
}
@Override
public void info(Object message) {
getLogger(Log::isInfoEnabled).info(message);
}
@Override
public void info(Object message, Throwable ex) {
getLogger(Log::isInfoEnabled).info(message, ex);
}
@Override
public void debug(Object message) {
getLogger(Log::isDebugEnabled).debug(message);
}
@Override
public void debug(Object message, Throwable ex) {
getLogger(Log::isDebugEnabled).debug(message, ex);
}
@Override
public void trace(Object message) {
getLogger(Log::isTraceEnabled).trace(message);
}
@Override
public void trace(Object message, Throwable ex) {
getLogger(Log::isTraceEnabled).trace(message, ex);
}
private Log getLogger(Predicate<Log> predicate) {
for (Log logger : this.loggers) {
if (predicate.test(logger)) {
return logger;
}
}
return NO_OP_LOG;
}
}