LevelFilter.java

/*
 * $Id$
 *
 * Copyright 2006, The jCoderZ.org Project. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials
 *      provided with the distribution.
 *    * Neither the name of the jCoderZ.org Project nor the names of
 *      its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written
 *      permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */
package org.jcoderz.commons.logging;

import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;

/**
 * This filter is used for filtering log messages according to the logger level.
 *
 */
public class LevelFilter
      implements Filter
{
   private final Set mAllowedLevels;

   /**
    * Creates a new instance of this and sets the logging levels, which will
    * pass this filter. All levels within the supplied list must be
    * given in their textual representation.
    *
    * @param levels The list storing passable logger levels in their textual
    * representation.
    */
   public LevelFilter (final List levels)
   {
      mAllowedLevels = new HashSet();
      if (levels != null)
      {
         for (final Iterator iter = levels.iterator(); iter.hasNext(); )
         {
            final Level level
                  = Level.parse((String) iter.next());
            mAllowedLevels.add(level);
         }
      }
   }

   /** {@inheritDoc} */
   public boolean isPassable (LogItem entry)
   {
      return mAllowedLevels.contains(entry.getLoggerLevel());
   }
}