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1
56 package org.objectstyle.cayenne;
57
58 import java.util.HashMap  ;
59 import java.util.Iterator ;
60 import java.util.List ;
61 import java.util.Map ;
62
63 import org.apache.commons.lang.builder.ToStringBuilder;
64 import org.objectstyle.cayenne.conf.Configuration;
65 import org.objectstyle.cayenne.map.DbAttribute;
66 import org.objectstyle.cayenne.map.DbEntity;
67 import org.objectstyle.cayenne.map.DbRelationship;
68 import org.objectstyle.cayenne.map.ObjEntity;
69 import org.objectstyle.cayenne.util.Util;
70
71
79
80 public class DataRow extends HashMap {
83
84
87 private static volatile long currentVersion = DataObject.DEFAULT_VERSION + 1;
89
90 protected long version = currentVersion++;
91 protected long replacesVersion = DataObject.DEFAULT_VERSION;
92
93 public DataRow(Map map) {
94 super(map);
95 }
96
97 public DataRow(int initialCapacity) {
98 super(initialCapacity);
99 }
100
101 public long getVersion() {
102 return version;
103 }
104
105 public long getReplacesVersion() {
106 return replacesVersion;
107 }
108
109
112 public void setReplacesVersion(long replacesVersion) {
113 this.replacesVersion = replacesVersion;
114 }
115
116
120 public DataRow applyDiff(DataRow diff) {
121 DataRow merged = new DataRow(this);
122
123 Iterator it = diff.entrySet().iterator();
124 while (it.hasNext()) {
125 Map.Entry entry = (Map.Entry ) it.next();
126 merged.put(entry.getKey(), entry.getValue());
127 }
128
129 return merged;
130 }
131
132
139 public DataRow createDiff(DataRow row) {
140
141 DataRow diff = null;
143
144 Iterator entries = entrySet().iterator();
145 while (entries.hasNext()) {
146 Map.Entry entry = (Map.Entry ) entries.next();
147
148 Object key = entry.getKey();
149 Object currentValue = entry.getValue();
150 Object rowValue = row.get(key);
151
152 if (!Util.nullSafeEquals(currentValue, rowValue)) {
153 if (diff == null) {
154 diff = new DataRow(this.size());
155 }
156 diff.put(key, rowValue);
157 }
158 }
159
160 return diff;
161 }
162
163
168 public ObjectId createObjectId(ObjEntity entity) {
169 return createObjectId(
170 entity.getJavaClass(Configuration.getResourceLoader()),
171 entity.getDbEntity());
172 }
173
174 public ObjectId createObjectId(Class objectClass, DbEntity entity) {
175
176
179 List pk = entity.getPrimaryKey();
180 if (pk.size() == 1) {
181 DbAttribute attr = (DbAttribute) pk.get(0);
182 Object val = this.get(attr.getName());
183 if (val == null) {
184 throw new CayenneRuntimeException(
185 "Null value for '" + attr.getName() + "'. Snapshot: " + this);
186 }
187
188 return new ObjectId(objectClass, attr.getName(), val);
189 }
190
191
193 Map idMap = new HashMap (pk.size() * 2);
194 Iterator it = pk.iterator();
195 while (it.hasNext()) {
196 DbAttribute attr = (DbAttribute) it.next();
197 Object val = this.get(attr.getName());
198 if (val == null) {
199 throw new CayenneRuntimeException(
200 "Null value for '" + attr.getName() + "'. Snapshot: " + this);
201 }
202
203 idMap.put(attr.getName(), val);
204 }
205
206 return new ObjectId(objectClass, idMap);
207 }
208
209
214 public ObjectId createTargetObjectId(
215 Class targetClass,
216 DbRelationship relationship) {
217
218 if (relationship.isToMany()) {
219 throw new CayenneRuntimeException("Only 'to one' can have a target ObjectId.");
220 }
221
222 Map target = relationship.targetPkSnapshotWithSrcSnapshot(this);
223 return (target != null) ? new ObjectId(targetClass, target) : null;
224 }
225
226 public String toString() {
227 return new ToStringBuilder(this).append("version", version).append(
228 " replaces",
229 replacesVersion).append(" values", super.toString()).toString();
230 }
231 }
232 |
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