Source Code Cross Referenced for StateOldDelete.java in  » Database-ORM » db-ojb » org » apache » ojb » odmg » states » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.odmg.states 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.broker.PersistenceBrokerException;
019:        import org.apache.ojb.odmg.ObjectEnvelope;
020:
021:        /**
022:         * this state represents old objects which have been marked for deletion during tx.
023:         */
024:        public class StateOldDelete extends ModificationState {
025:            private static StateOldDelete _instance = new StateOldDelete();
026:
027:            /**
028:             * private constructor: use singleton instance
029:             */
030:            private StateOldDelete() {
031:            }
032:
033:            /**
034:             * perform a checkpoint, i.e. perform updates on underlying db but keep locks on objects
035:             */
036:            public static StateOldDelete getInstance() {
037:                return _instance;
038:            }
039:
040:            /**
041:             * return resulting state after marking clean
042:             */
043:            public ModificationState markClean() {
044:                return StateOldClean.getInstance();
045:            }
046:
047:            /**
048:             * return resulting state after marking delete
049:             */
050:            public ModificationState markDelete() {
051:                return this ;
052:            }
053:
054:            /**
055:             * return resulting state after marking dirty
056:             */
057:            public ModificationState markDirty() {
058:                return this ;
059:            }
060:
061:            /**
062:             * return resulting state after marking new
063:             */
064:            public ModificationState markNew() {
065:                return StateOldDirty.getInstance();
066:            }
067:
068:            /**
069:             * return resulting state after marking old
070:             */
071:            public ModificationState markOld() {
072:                return this ;
073:            }
074:
075:            /**
076:             * returns true is this state requires DELETE
077:             * @return boolean
078:             */
079:            public boolean needsDelete() {
080:                return true;
081:            }
082:
083:            /**
084:             * rollback the transaction
085:             */
086:            public void checkpoint(ObjectEnvelope mod)
087:                    throws org.apache.ojb.broker.PersistenceBrokerException {
088:                mod.doDelete();
089:                mod.setModificationState(StateTransient.getInstance());
090:            }
091:
092:            /**
093:             * commit the associated transaction
094:             */
095:            public void commit(ObjectEnvelope mod)
096:                    throws PersistenceBrokerException {
097:                mod.doDelete();
098:                mod.setModificationState(StateTransient.getInstance());
099:            }
100:
101:            /**
102:             *
103:             */
104:            public void rollback(ObjectEnvelope mod) {
105:                mod.doEvictFromCache();
106:            }
107:        }
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