Log4jLogger.java

/*
 * Copyright 2023-2024 Markitect
 *
 * 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
 *
 *     http://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 dev.markitect.liquibase.logging;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.logging.Level;
import liquibase.logging.core.AbstractLogger;
import org.apache.logging.log4j.spi.ExtendedLogger;
import org.jspecify.annotations.Nullable;

@SuppressWarnings("squid:S2160")
public class Log4jLogger extends AbstractLogger {
  private static final String FQCN = Log4jLogger.class.getName();
  private static final int DEBUG_THRESHOLD = Level.FINER.intValue();
  private static final int INFO_THRESHOLD = Level.INFO.intValue();
  private static final int WARN_THRESHOLD = Level.WARNING.intValue();
  private static final int ERROR_THRESHOLD = Level.SEVERE.intValue();

  private static org.apache.logging.log4j.Level toLog4jLevel(Level level) {
    if (level.equals(Level.OFF)) {
      return org.apache.logging.log4j.Level.OFF;
    }
    int value = level.intValue();
    if (value < DEBUG_THRESHOLD) {
      return org.apache.logging.log4j.Level.TRACE;
    }
    if (value < INFO_THRESHOLD) {
      return org.apache.logging.log4j.Level.DEBUG;
    }
    if (value < WARN_THRESHOLD) {
      return org.apache.logging.log4j.Level.INFO;
    }
    if (value < ERROR_THRESHOLD) {
      return org.apache.logging.log4j.Level.WARN;
    }
    return org.apache.logging.log4j.Level.ERROR;
  }

  private final ExtendedLogger logger;

  public Log4jLogger(ExtendedLogger logger) {
    this.logger = checkNotNull(logger);
  }

  @Override
  public void severe(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.ERROR, null, message);
  }

  @Override
  public void severe(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.ERROR, null, message, e);
  }

  @Override
  public void warning(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.WARN, null, message);
  }

  @Override
  public void warning(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.WARN, null, message, e);
  }

  @Override
  public void info(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.INFO, null, message);
  }

  @Override
  public void info(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.INFO, null, message, e);
  }

  @Override
  public void config(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message);
  }

  @Override
  public void config(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message, e);
  }

  @Override
  public void fine(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message);
  }

  @Override
  public void fine(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message, e);
  }

  @Override
  public void debug(@Nullable String message) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message);
  }

  @Override
  public void debug(@Nullable String message, @Nullable Throwable e) {
    logger.logIfEnabled(FQCN, org.apache.logging.log4j.Level.DEBUG, null, message, e);
  }

  @Override
  public void close() {
    // Redeclared to throw no exception
  }

  @Override
  public void log(Level level, @Nullable String message, @Nullable Throwable e) {
    checkNotNull(level);
    logger.logIfEnabled(FQCN, toLog4jLevel(level), null, message, e);
  }
}