Source for gnu.classpath.debug.PreciseFilter

   1: /* PreciseFilter.java -- filter log messages by precise level.
   2:    Copyright (C) 2005  Free Software Foundation, Inc.
   3: 
   4: This file is a part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2 of the License, or (at
   9: your option) any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; if not, write to the Free Software
  18: Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under terms
  30: of your choice, provided that you also meet, for each linked independent
  31: module, the terms and conditions of the license of that module.  An
  32: independent module is a module which is not derived from or based on
  33: this library.  If you modify this library, you may extend this exception
  34: to your version of the library, but you are not obligated to do so.  If
  35: you do not wish to do so, delete this exception statement from your
  36: version.  */
  37: 
  38: 
  39: package gnu.classpath.debug;
  40: 
  41: import java.util.BitSet;
  42: import java.util.logging.Filter;
  43: import java.util.logging.LogRecord;
  44: 
  45: public final class PreciseFilter implements Filter
  46: {
  47: 
  48:   /**
  49:    * The singleton filter instance.
  50:    */
  51:   public static final PreciseFilter GLOBAL = new PreciseFilter ();
  52: 
  53:   private final BitSet enabled;
  54: 
  55:   private PreciseFilter ()
  56:   {
  57:     enabled = new BitSet ();
  58:   }
  59: 
  60:   /**
  61:    * Disable logging of a component.
  62:    *
  63:    * @param component The component to disable logging for.
  64:    * @throws NullPointerException If component is null.
  65:    */
  66:   public void disable (final Component component)
  67:   {
  68:     enabled.clear (component.startIndex (), component.endIndex ());
  69:   }
  70: 
  71:   /**
  72:    * Enable logging of a component.
  73:    *
  74:    * @param component The component to enable logging for.
  75:    * @throws NullPointerException If component is null.
  76:    */
  77:   public void enable (final Component component)
  78:   {
  79:     enabled.set (component.startIndex (), component.endIndex ());
  80:   }
  81: 
  82:   /**
  83:    * Tell if a component is enabled for logging.
  84:    *
  85:    * @param component The component to test.
  86:    * @return True iff the specified component is enabled for logging.
  87:    * @throws NullPointerException If component is null.
  88:    */
  89:   public boolean isEnabled (final Component component)
  90:   {
  91:     return (enabled.get (component.startIndex ()));
  92:   }
  93: 
  94:   public boolean isLoggable (final LogRecord record)
  95:   {
  96:     try
  97:       {
  98:         return isEnabled ((Component) record.getLevel ());
  99:       }
 100:     catch (ClassCastException cce)
 101:       {
 102:         return true;
 103:       }
 104:   }
 105: }