Source for gnu.classpath.jdwp.event.filters.ClassOnlyFilter

   1: /* ClassOnlyFilter.java -- filter on specific class
   2:    Copyright (C) 2005 Free Software Foundation
   3: 
   4: This file is 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, or (at your option)
   9: 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; see the file COPYING.  If not, write to the
  18: Free Software 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
  30: terms of your choice, provided that you also meet, for each linked
  31: terms of your choice, provided that you also meet, for each linked
  32: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: 
  40: package gnu.classpath.jdwp.event.filters;
  41: 
  42: import gnu.classpath.jdwp.event.Event;
  43: import gnu.classpath.jdwp.exception.InvalidClassException;
  44: import gnu.classpath.jdwp.id.ReferenceTypeId;
  45: 
  46: /**
  47:  * An event filter which filters out events in uninteresting
  48:  * classes.
  49:  *
  50:  * @author Keith Seitz  (keiths@redhat.com)
  51:  */
  52: public class ClassOnlyFilter
  53:   implements IEventFilter
  54: {
  55:   // Class ID for which to filter
  56:   private ReferenceTypeId _id;
  57: 
  58:   /**
  59:    * Constructs a new <code>ClassOnlyFilter</code>
  60:    *
  61:    * @param refId  the reference type id for a class for which events
  62:    *               will be reported
  63:    * @throws InvalidClassException if the ID is no longer valid
  64:    */
  65:   public ClassOnlyFilter (ReferenceTypeId refId)
  66:     throws InvalidClassException
  67:   {
  68:     // validity check
  69:     refId.getType ();
  70:     _id = refId;
  71:   }
  72: 
  73:   /**
  74:    * Returns the class to which to restrict events
  75:    *
  76:    * @return the class's ID
  77:    */
  78:   public ReferenceTypeId getType ()
  79:   {
  80:     return _id;
  81:   }
  82: 
  83:   /**
  84:    * Does the given event match the filter?
  85:    *
  86:    * @param event  the <code>Event</code> to scrutinize
  87:    */
  88:   public boolean matches (Event event)
  89:   {
  90:     Object type = event.getParameter (Event.EVENT_CLASS);
  91:     if (type != null)
  92:       {
  93:         try
  94:           {
  95:             Class clazz = _id.getType ();
  96:             Class eventClass = (Class) type;
  97:             if (clazz.isAssignableFrom (eventClass))
  98:               return true;
  99:           }
 100:         catch (InvalidClassException ice)
 101:           {
 102:             // class is no longer valid
 103:             return false;
 104:           }
 105:       }
 106: 
 107:     return false;
 108:   }
 109: }