On Fri, 2005-06-17 at 12:25 -0700, Keith Seitz wrote:
> ChangeLog
> 2005-06-17 Keith Seitz <[EMAIL PROTECTED]>
>
> * gnu/classpath/jdwp/id/ReferenceKey.java: New file.
Geez. I did it again...
Patch is attached this time. Really. It is. I promise.
Keith
Index: gnu/classpath/jdwp/id/ReferenceKey.java
===================================================================
RCS file: gnu/classpath/jdwp/id/ReferenceKey.java
diff -N gnu/classpath/jdwp/id/ReferenceKey.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gnu/classpath/jdwp/id/ReferenceKey.java 17 Jun 2005 19:24:36 -0000
@@ -0,0 +1,130 @@
+/* ReferenceKey.java -- a SoftReference key type for Jdwp IDs
+ Copyright (C) 2005 Free Software Foundation
+
+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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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
+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.id;
+
+import gnu.classpath.jdwp.exception.InvalidObjectException;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.SoftReference;
+
+/**
+ * This class is a softreference type that is used by
+ * the ID manager as an index into a hash table.
+ */
+public class ReferenceKey extends SoftReference
+{
+ // Hash code of referent
+ private int _hash;
+
+ /**
+ * Constructs a new <code>ReferenceKey</code> object
+ * with the given referent.
+ *
+ * <p>This constructor should only be used for object lookups
+ * by the backend.
+ *
+ * @param referent the object to reference
+ */
+ public ReferenceKey (Object referent)
+ {
+ super (referent);
+ _hash = referent.hashCode ();
+ }
+
+ /**
+ * Constructs a new <code>ReferenceKey</code> object
+ * with the given referent and reference queue.
+ *
+ * <p>The JDWP back-end stores a <code>ReferenceKey</code>
+ * with its corresponding <code>JdwpId</code>. This constructor
+ * is used by the back-end when adding new IDs to be managed.
+ *
+ * @param referent the object to reference
+ * @param queue the queue to which to report garbage collections
+ */
+ public ReferenceKey (Object referent, ReferenceQueue queue)
+ {
+ super (referent, queue);
+ _hash = referent.hashCode ();
+ }
+
+ /**
+ * Returns the hash code of the referent.
+ * This seems hacky, but is required in order to use this class
+ * as a hash table key.
+ *
+ * @returns the hash code of the referent
+ */
+ public int hashCode ()
+ {
+ return _hash;
+ }
+
+ /**
+ * Comparator for keys
+ *
+ * This method can be used in two ways:
+ *
+ * <ol>
+ * <li>For table lookups, where we want to compare referents</li>
+ * <li>For clearing GCd objects, where we want to compare the actual
+ * key object (not the referent)</li>
+ * </ol>
+ */
+ public boolean equals (Object obj)
+ {
+ if (obj instanceof ReferenceKey)
+ {
+ ReferenceKey ref = (ReferenceKey) obj;
+
+ /* First check if the two references are the same.
+ If they are, that means we must be clearing GCd objects. */
+ if (this == obj)
+ return true;
+
+ // That failed, so we're looking for a matching Object
+ Object me = get ();
+ Object other = ref.get ();
+ return (me == null ? false : me.equals (other));
+ }
+
+ return false;
+ }
+}
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