/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.logging.log4j.core.filter;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.Logger;
  import org.apache.logging.log4j.core.config.Node;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.message.Message;
  
  /**
   * This filter returns the {@code onMatch} result if the level in the {@code LogEvent} is in the range of the configured
   * min and max levels, otherwise it returns {@code onMismatch} value . For example, if the filter is configured with
   * {@link Level#ERROR} and {@link Level#INFO} and the LogEvent contains {@link Level#WARN} then the onMatch value will
   * be returned since {@link Level#WARN WARN} events are in between {@link Level#ERROR ERROR} and {@link Level#INFO
   * INFO}.
   * <p>
   * The default Levels are both {@link Level#ERROR ERROR}.
   * </p>
   */
  @Plugin(name = "LevelRangeFilter", category = Node.CATEGORY, elementType = Filter.ELEMENT_TYPE, printObject = true)
  public final class LevelRangeFilter extends AbstractFilter {
  
      /**
       * Create a ThresholdFilter.
       * 
       * @param minLevel
       *            The minimum log Level.
       * @param maxLevel
       *            The maximum log Level.
       * @param match
       *            The action to take on a match.
       * @param mismatch
       *            The action to take on a mismatch.
       * @return The created ThresholdFilter.
       */
      @PluginFactory
      public static LevelRangeFilter createFilter(
              // @formatter:off
              @PluginAttribute("minLevel") final Level minLevel,
              @PluginAttribute("maxLevel") final Level maxLevel,
              @PluginAttribute("onMatch") final Result match, 
              @PluginAttribute("onMismatch") final Result mismatch) {
              // @formatter:on
          final Level actualMinLevel = minLevel == null ? Level.ERROR : minLevel;
          final Level actualMaxLevel = maxLevel == null ? Level.ERROR : maxLevel;
          final Result onMatch = match == null ? Result.NEUTRAL : match;
          final Result onMismatch = mismatch == null ? Result.DENY : mismatch;
          return new LevelRangeFilter(actualMinLevel, actualMaxLevel, onMatch, onMismatch);
      }
      private final Level maxLevel;
  
      private final Level minLevel;
  
      private LevelRangeFilter(final Level minLevel, final Level maxLevel, final Result onMatch, final Result onMismatch) {
          super(onMatch, onMismatch);
          this.minLevel = minLevel;
          this.maxLevel = maxLevel;
      }
  
      private Result filter(final Level level) {
          return level.isInRange(this.minLevel, this.maxLevel) ? onMatch : onMismatch;
      }
  
      @Override
      public Result filter(final LogEvent event) {
          return filter(event.getLevel());
      }
  
      @Override
      public Result filter(final Logger logger, final Level level, final Marker marker, final Message msg,
              final Throwable t) {
          return filter(level);
      }
  
      @Override
      public Result filter(final Logger logger, final Level level, final Marker marker, final Object msg,
              final Throwable t) {
          return filter(level);
      }
 
     @Override
     public Result filter(final Logger logger, final Level level, final Marker marker, final String msg,
             final Object... params) {
         return filter(level);
     }
 
     public Level getMinLevel() {
         return minLevel;
     }
 
     @Override
     public String toString() {
         return minLevel.toString();
     }
 
 }