001: package org.apache.ojb.odmg.states;
002:
003: /* Copyright 2002-2005 The Apache Software Foundation
004: *
005: * Licensed under the Apache License, Version 2.0 (the "License");
006: * you may not use this file except in compliance with the License.
007: * You may obtain a copy of the License at
008: *
009: * http://www.apache.org/licenses/LICENSE-2.0
010: *
011: * Unless required by applicable law or agreed to in writing, software
012: * distributed under the License is distributed on an "AS IS" BASIS,
013: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014: * See the License for the specific language governing permissions and
015: * limitations under the License.
016: */
017:
018: import org.apache.ojb.odmg.ObjectEnvelope;
019:
020: /**
021: * this state represents new objects which have been mrked for deletion during tx.
022: */
023: public class StateNewDelete extends ModificationState {
024: private static StateNewDelete _instance = new StateNewDelete();
025:
026: /**
027: * return resulting state after marking clean
028: */
029: public ModificationState markClean() {
030: return StateNewClean.getInstance();
031: }
032:
033: /**
034: * return resulting state after marking delete
035: */
036: public ModificationState markDelete() {
037: return this ;
038: }
039:
040: /**
041: * return resulting state after marking dirty
042: */
043: public ModificationState markDirty() {
044: return this ;
045: }
046:
047: /**
048: * return resulting state after marking new
049: */
050: public ModificationState markNew() {
051: return StateNewDirty.getInstance();
052: }
053:
054: /**
055: * return resulting state after marking old
056: */
057: public ModificationState markOld() {
058: return StateOldDelete.getInstance();
059: }
060:
061: /**
062: * returns true is this state requires DELETE
063: * @return boolean
064: */
065: public boolean needsDelete() {
066: return true;
067: }
068:
069: /**
070: * private constructor: use singleton instance
071: */
072: private StateNewDelete() {
073: }
074:
075: /**
076: * perform a checkpoint, i.e. perform updates on underlying db but keep locks on objects
077: */
078: public static StateNewDelete getInstance() {
079: return _instance;
080: }
081:
082: /**
083: * rollback the ObjectModification
084: */
085: public void checkpoint(ObjectEnvelope mod) {
086: }
087:
088: /**
089: * commit ObjectModification
090: */
091: public void commit(ObjectEnvelope mod) {
092: mod.doEvictFromCache();
093: mod.setModificationState(StateTransient.getInstance());
094: }
095:
096: /**
097: *
098: */
099: public void rollback(ObjectEnvelope mod) {
100: mod.doEvictFromCache();
101: mod.setModificationState(StateTransient.getInstance());
102: }
103: }
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