/* 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 (keiths@redhat.com) */ 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 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; // Special case: arrays if (object.getClass ().isArray ()) id = new ArrayId (); else { // 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", ie); } catch (IllegalAccessException iae) { // This really should not happen throw new RuntimeException ("illegal access of ID", iae); } } } /* getSuperclass returned null and no matching ID type found. So it must derive from Object. */ id = new ObjectId (); } synchronized (_idLock) { id.setId (++_lastId); } return id; } /** * Returns a new reference type id for the given class * * @param clazz the Class for which an id is desired * @returns a suitable reference type id or null */ 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; } } }