Adds ClassUnloadEvent to JDWP.  Requesting approval and commit.

ChangeLog:

2006-06-12 Kyle Galloway    <[EMAIL PROTECTED]>

   * gnu/classpath/jdwp/event/ClassUnloadEvent.java: New File.

Index: ClassUnloadEvent.java
===================================================================
RCS file: ClassUnloadEvent.java
diff -N ClassUnloadEvent.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ ClassUnloadEvent.java	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,102 @@
+/* ClassUnloadEvent.java -- event generated when a class is unloaded
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+ This file is part of GNU Classpath.
+
+ GNU Classpath is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GNU Classpath is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNU Classpath; see the file COPYING.  If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA.
+
+ Linking this library statically or dynamically with other modules is
+ making a combined work based on this library.  Thus, the terms and
+ conditions of the GNU General Public License cover the whole
+ combination.
+
+ As a special exception, the copyright holders of this library give you
+ permission to link this library with independent modules to produce an
+ executable, regardless of the license terms of these independent
+ modules, and to copy and distribute the resulting executable under
+ terms of your choice, provided that you also meet, for each linked
+ independent module, the terms and conditions of the license of that
+ module.  An independent module is a module which is not derived from
+ or based on this library.  If you modify this library, you may extend
+ this exception to your version of the library, but you are not
+ obligated to do so.  If you do not wish to do so, delete this
+ exception statement from your version. */
+
+
+package gnu.classpath.jdwp.event;
+
+import gnu.classpath.jdwp.JdwpConstants;
+import gnu.classpath.jdwp.VMIdManager;
+import gnu.classpath.jdwp.id.ReferenceTypeId;
+import gnu.classpath.jdwp.util.JdwpString;
+import gnu.classpath.jdwp.util.Signature;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+/**
+ * "Notification of a class unload in the target VM" -- JDWP 1.4.2
+ * 
+ * @author Kyle Galloway ([EMAIL PROTECTED])
+ */
+public class ClassUnloadEvent
+    extends Event
+{
+  // the class that was unloaded
+  private Class _class;
+
+  /**
+   * Constructs a new <code>ClassUnloadEvent</code>
+   * 
+   * @param clazz class which was prepared
+   */
+  public ClassUnloadEvent(Class clazz)
+  {
+    super(JdwpConstants.EventKind.CLASS_UNLOAD);
+    _class = clazz;
+  }
+
+  /**
+   * Returns a specific filtering parameter for this event. Class is the only
+   * valid type.
+   * 
+   * @param type the type of parameter desired
+   * @returns the desired parameter or <code>null</code>
+   */
+  public Object getParameter(int type)
+  {
+    if (type == EVENT_CLASS)
+      return _class;
+
+    return null;
+  }
+
+  /**
+   * Writes the event to the given stream
+   * 
+   * @param outStream the output stream to write the event to
+   */
+  protected void _writeData(DataOutputStream outStream) 
+    throws IOException
+  {
+    VMIdManager idm = VMIdManager.getDefault();
+    ReferenceTypeId rid = idm.getReferenceTypeId(_class);
+
+    rid.writeTagged(outStream);
+    JdwpString.writeString(outStream, Signature.computeClassSignature(_class));
+  }
+
+}

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