Hi,
This is a pretty simple class which just generates new IDs for objects
and reference types. There is no synchronization here since only the
IdManager is supposed to access this class.
Problems/questions/comments?
Keith
ChangeLog
2005-06-14 Keith Seitz <[EMAIL PROTECTED]>
* gnu/classpath/jdwp/id/JdwpIdFactory.java: New file.
Index: gnu/classpath/jdwp/id/JdwpIdFactory.java
===================================================================
RCS file: gnu/classpath/jdwp/id/JdwpIdFactory.java
diff -N gnu/classpath/jdwp/id/JdwpIdFactory.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gnu/classpath/jdwp/id/JdwpIdFactory.java 14 Jun 2005 18:22:59 -0000
@@ -0,0 +1,163 @@
+/* JdwpIdFactory.java -- factory for generating type and object 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 java.util.HashMap;
+
+/**
+ * This factory generates ids for objects and types that may
+ * be sent to a debugger.
+ *
+ * @author Keith Seitz ([EMAIL PROTECTED])
+ */
+public class JdwpIdFactory
+{
+ // ID of last object / referencetype
+ private static Object _idLock = new Object ();
+ private static Object _ridLock = new Object ();
+ private static long _lastId = 0;
+ private static long _lastRid = 0;
+
+ // A list of all ID types
+ private static HashMap _idList = new HashMap ();
+
+ // Initialize the id list with known types
+ static
+ {
+ /* ObjectId and ArrayId are special cases. See
+ end if newId. */
+ _idList.put (ClassLoaderId.typeClass, ClassLoaderId.class);
+ _idList.put (ClassObjectId.typeClass, ClassObjectId.class);
+ //_idList.put (FieldId.typeClass, FieldId.class);
+ //_idList.put (FrameId.typeClass, FrameId.class);
+ //_idList.put (MethodId.typeClass, MethodId.class);
+ _idList.put (StringId.typeClass, StringId.class);
+ _idList.put (ThreadId.typeClass, ThreadId.class);
+ _idList.put (ThreadGroupId.typeClass, ThreadGroupId.class);
+ }
+
+ /**
+ * Returns a new id for the given object
+ *
+ * @param object the object for which an id is desired
+ * @returns a suitable object id
+ */
+ public static JdwpId newId (Object object)
+ {
+ JdwpId id = null;
+
+ // Loop through all classes until we hit baseclass
+ Class myClass;
+ for (myClass = object.getClass (); myClass != null;
+ myClass = myClass.getSuperclass ())
+ {
+ Class clz = (Class) _idList.get (myClass);
+ if (clz != null)
+ {
+ try
+ {
+ id = (JdwpId) clz.newInstance ();
+ synchronized (_idLock)
+ {
+ id.setId (++_lastId);
+ }
+ return id;
+ }
+ catch (InstantiationException ie)
+ {
+ // This really should not happen
+ throw new RuntimeException ("cannot create new ID");
+ }
+ catch (IllegalAccessException iae)
+ {
+ // This really should not happen
+ throw new RuntimeException ("illegal access of ID");
+ }
+ }
+ }
+
+ /* getSuperclass returned null and no matching ID type found.
+ So there are only two choices left: an array or something
+ deriving from Object. */
+ if (object.getClass ().isArray ())
+ id = new ArrayId ();
+ else
+ id = new ObjectId ();
+
+ synchronized (_idLock)
+ {
+ id.setId (++_lastId);
+ }
+ return id;
+ }
+
+ /**
+ * Returns a new reference type id for the given class
+ *
+ * @param clazz the <code>Class</code> for which an id is desired
+ * @returns a suitable reference type id or <code>null</code>
+ */
+ public static ReferenceTypeId newReferenceTypeId (Class clazz)
+ {
+ ReferenceTypeId id = null;
+ try
+ {
+ if (clazz.isArray ())
+ id = new ArrayReferenceTypeId ();
+ else if (clazz.isInterface ())
+ id = new InterfaceReferenceTypeId ();
+ else
+ id = new ClassReferenceTypeId ();
+ synchronized (_ridLock)
+ {
+ id.setId (++_lastRid);
+ }
+ return id;
+ }
+ catch (InstantiationException ie)
+ {
+ return null;
+ }
+ catch (IllegalAccessException iae)
+ {
+ return null;
+ }
+ }
+}
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