01: /**
02: * Speedo: an implementation of JDO compliant personality on top of JORM generic
03: * I/O sub-system.
04: * Copyright (C) 2001-2004 France Telecom R&D
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: *
20: *
21: *
22: * Contact: speedo@objectweb.org
23: *
24: */package org.objectweb.speedo.workingset.filter;
25:
26: import java.util.Iterator;
27: import java.util.LinkedHashMap;
28: import java.util.Map;
29:
30: import org.objectweb.perseus.persistence.api.VirtualState;
31: import org.objectweb.perseus.persistence.api.WorkingSet;
32: import org.objectweb.perseus.persistence.api.WorkingSetFilter;
33: import org.objectweb.speedo.genclass.api.SpeedoGenClassPO;
34: import org.objectweb.speedo.mim.api.StateItf;
35:
36: /**
37: * This filter enables to order objects involved in the working set as follows:
38: * -------------------------------------
39: * | PersistentObjectItf | SpeedoGenClassPO |
40: * -------------------------------------
41: * @author Y.Bersihand
42: */
43: public class WorkingSetGenClassFilter implements WorkingSetFilter {
44:
45: //remove all the GenClass from the ws map and put it in a tmp map
46: //add the tmp map in the end of the ws map
47: //the ws map is then ordered as described above
48: public void order(WorkingSet ws) {
49: //get the map (oid,entry)
50: Map wsMap = ws.getOid2Entry();
51: //get a copy to iterate over
52: Map wsMapCopy = new LinkedHashMap(wsMap);
53: //tmp map
54: Map genClassMap = new LinkedHashMap();
55: Iterator it = wsMapCopy.keySet().iterator();
56: while (it.hasNext()) {
57: Object oid = it.next();
58: org.objectweb.perseus.persistence.api.State state = (org.objectweb.perseus.persistence.api.State) wsMap
59: .get(oid);
60: if (!(state instanceof VirtualState)
61: && ((StateItf) state).getSpeedoPO() instanceof SpeedoGenClassPO) {
62: //remove the element from the ws map
63: //and add it in the tmp map
64: genClassMap.put(oid, wsMap.remove(oid));
65: }
66: }
67: //the wsMap contains only PersistentObjectItf
68: //when can add all the SpeedoGenClassPO in the end of the map
69: wsMap.putAll(genClassMap);
70: }
71: }
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