gomp-20050608-branch/libjava/classpath/gnu/classpath/jdwp/event/filters/ClassOnlyFilter.java

   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 (ReferenceTypeId.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 }