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Java > Open Source Codes > org > objectstyle > cayenne > access > DataContextObjectFactory


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
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22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
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54  * <http://objectstyle.org/>.
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56 package org.objectstyle.cayenne.access;
57
58 import java.util.ArrayList JavaDoc;
59 import java.util.Iterator JavaDoc;
60 import java.util.List JavaDoc;
61
62 import org.objectstyle.cayenne.CayenneRuntimeException;
63 import org.objectstyle.cayenne.DataObject;
64 import org.objectstyle.cayenne.DataRow;
65 import org.objectstyle.cayenne.ObjectFactory;
66 import org.objectstyle.cayenne.ObjectId;
67 import org.objectstyle.cayenne.PersistenceState;
68 import org.objectstyle.cayenne.map.DbEntity;
69 import org.objectstyle.cayenne.map.EntityInheritanceTree;
70 import org.objectstyle.cayenne.map.ObjEntity;
71
72 /**
73  * An ObjectFactory compatble with pre-ObjectContext DataContext.
74  *
75  * @since 1.2
76  * @author Andrus Adamchik
77  */
78 // TODO: had to make it public as SelectObserver needs to access this class
79 // get rid of it all together until 1.2 goes beta.
80 public class DataContextObjectFactory implements ObjectFactory {
81
82     DataContext context;
83     boolean refreshObjects;
84     boolean resolveInheritance;
85
86     public DataContextObjectFactory(DataContext context, boolean refreshObjects,
87             boolean resolveInheritance) {
88         this.context = context;
89         this.refreshObjects = refreshObjects;
90         this.resolveInheritance = resolveInheritance;
91     }
92
93     public List JavaDoc objectsFromDataRows(ObjEntity entity, List JavaDoc rows) {
94         if (rows == null || rows.size() == 0) {
95             return new ArrayList JavaDoc(1);
96         }
97
98         // do a sanity check on ObjEntity... if it's DbEntity has no PK defined,
99 // we can't build a valid ObjectId
100 DbEntity dbEntity = entity.getDbEntity();
101         if (dbEntity == null) {
102             throw new CayenneRuntimeException("ObjEntity '"
103                     + entity.getName()
104                     + "' has no DbEntity.");
105         }
106
107         if (dbEntity.getPrimaryKey().size() == 0) {
108             throw new CayenneRuntimeException("Can't create ObjectId for '"
109                     + entity.getName()
110                     + "'. Reason: DbEntity '"
111                     + dbEntity.getName()
112                     + "' has no Primary Key defined.");
113         }
114
115         // check inheritance
116 EntityInheritanceTree tree = null;
117         if (resolveInheritance) {
118             tree = context.getEntityResolver().lookupInheritanceTree(entity);
119         }
120
121         List JavaDoc results = new ArrayList JavaDoc(rows.size());
122         Iterator JavaDoc it = rows.iterator();
123
124         // must do double sync...
125 synchronized (context.getObjectStore()) {
126             synchronized (context.getObjectStore().getDataRowCache()) {
127                 while (it.hasNext()) {
128                     DataRow dataRow = (DataRow) it.next();
129
130                     // determine entity to use
131 ObjEntity objectEntity = entity;
132
133                     if (tree != null) {
134                         objectEntity = tree.entityMatchingRow(dataRow);
135
136                         // still null.... looks like inheritance qualifiers are messed up
137 if (objectEntity == null) {
138                             objectEntity = entity;
139                         }
140                     }
141
142                     ObjectId anId = dataRow.createObjectId(objectEntity);
143
144                     // this will create a HOLLOW object if it is not registered yet
145 DataObject object = context.registeredObject(anId);
146
147                     // deal with object state
148 int state = object.getPersistenceState();
149                     switch (state) {
150                         case PersistenceState.COMMITTED:
151                         case PersistenceState.MODIFIED:
152                         case PersistenceState.DELETED:
153                             // process the above only if refresh is requested...
154 if (!refreshObjects) {
155                                 break;
156                             }
157                         case PersistenceState.HOLLOW:
158                             DataRowUtils.mergeObjectWithSnapshot(objectEntity,
159                                     object,
160                                     dataRow);
161                         default:
162                             break;
163                     }
164
165                     object.setSnapshotVersion(dataRow.getVersion());
166                     object.fetchFinished();
167                     results.add(object);
168                 }
169
170                 // now deal with snapshots
171 context.getObjectStore().snapshotsUpdatedForObjects(results,
172                         rows,
173                         refreshObjects);
174             }
175         }
176
177         return results;
178     }
179
180 }
181
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