Source Code Cross Referenced for ImplHelper.java in  » Database-ORM » openjpa » org » apache » openjpa » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Database ORM » openjpa » org.apache.openjpa.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one
003:         * or more contributor license agreements.  See the NOTICE file
004:         * distributed with this work for additional information
005:         * regarding copyright ownership.  The ASF licenses this file
006:         * to you under the Apache License, Version 2.0 (the
007:         * "License"); you may not use this file except in compliance
008:         * with the License.  You may obtain a copy of the License at
009:         *
010:         * http://www.apache.org/licenses/LICENSE-2.0
011:         *
012:         * Unless required by applicable law or agreed to in writing,
013:         * software distributed under the License is distributed on an
014:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015:         * KIND, either express or implied.  See the License for the
016:         * specific language governing permissions and limitations
017:         * under the License.    
018:         */
019:        package org.apache.openjpa.util;
020:
021:        import java.util.ArrayList;
022:        import java.util.BitSet;
023:        import java.util.Collection;
024:        import java.util.Collections;
025:        import java.util.Iterator;
026:        import java.util.Map;
027:
028:        import org.apache.openjpa.enhance.PersistenceCapable;
029:        import org.apache.openjpa.enhance.PCRegistry;
030:        import org.apache.openjpa.enhance.StateManager;
031:        import org.apache.openjpa.enhance.ManagedInstanceProvider;
032:        import org.apache.openjpa.enhance.ReflectingPersistenceCapable;
033:        import org.apache.openjpa.enhance.RuntimeUnenhancedClasssesModes;
034:        import org.apache.openjpa.kernel.FetchConfiguration;
035:        import org.apache.openjpa.kernel.LockManager;
036:        import org.apache.openjpa.kernel.OpenJPAStateManager;
037:        import org.apache.openjpa.kernel.PCState;
038:        import org.apache.openjpa.kernel.StoreContext;
039:        import org.apache.openjpa.kernel.StoreManager;
040:        import org.apache.openjpa.lib.util.Closeable;
041:        import org.apache.openjpa.lib.util.ReferenceMap;
042:        import org.apache.openjpa.lib.util.UUIDGenerator;
043:        import org.apache.openjpa.lib.util.concurrent.ConcurrentReferenceHashMap;
044:        import org.apache.openjpa.meta.ClassMetaData;
045:        import org.apache.openjpa.meta.FieldMetaData;
046:        import org.apache.openjpa.meta.JavaTypes;
047:        import org.apache.openjpa.meta.SequenceMetaData;
048:        import org.apache.openjpa.meta.ValueStrategies;
049:        import org.apache.openjpa.conf.OpenJPAConfiguration;
050:
051:        /**
052:         * Helper for OpenJPA back-ends.
053:         *
054:         * @since 0.3.0
055:         * @author Abe White
056:         * @nojavadoc
057:         */
058:        public class ImplHelper {
059:
060:            // Cache for from/to type assignments
061:            private static final Map _assignableTypes = new ConcurrentReferenceHashMap(
062:                    ReferenceMap.WEAK, ReferenceMap.HARD);
063:
064:            // map of all new unenhanced instances active in this classloader
065:            public static final Map _unenhancedInstanceMap = new ConcurrentReferenceHashMap(
066:                    ReferenceMap.WEAK, ReferenceMap.HARD) {
067:
068:                protected boolean eq(Object x, Object y) {
069:                    // the Entries in ConcurrentReferenceHashMap delegate back to
070:                    // eq() in their equals() impls
071:                    if (x instanceof  Map.Entry)
072:                        return super .eq(x, y);
073:                    else
074:                        return x == y;
075:                }
076:
077:                protected int hc(Object o) {
078:                    // the Entries in ConcurrentReferenceHashMap delegate back to
079:                    // hc() in their hashCode() impls
080:                    if (o instanceof  Map.Entry)
081:                        return super .hc(o);
082:                    else
083:                        return System.identityHashCode(o);
084:                }
085:            };
086:
087:            /**
088:             * Helper for store manager implementations. This method simply delegates
089:             * to the proper singular method for each state manager.
090:             *
091:             * @see StoreManager#loadAll
092:             * @since 0.4.0
093:             */
094:            public static Collection loadAll(Collection sms,
095:                    StoreManager store, PCState state, int load,
096:                    FetchConfiguration fetch, Object context) {
097:                Collection failed = null;
098:                OpenJPAStateManager sm;
099:                LockManager lm;
100:                for (Iterator itr = sms.iterator(); itr.hasNext();) {
101:                    sm = (OpenJPAStateManager) itr.next();
102:                    if (sm.getManagedInstance() == null) {
103:                        if (!store.initialize(sm, state, fetch, context))
104:                            failed = addFailedId(sm, failed);
105:                    } else if (load != StoreManager.FORCE_LOAD_NONE
106:                            || sm.getPCState() == PCState.HOLLOW) {
107:                        lm = sm.getContext().getLockManager();
108:                        if (!store.load(sm, sm.getUnloaded(fetch), fetch, lm
109:                                .getLockLevel(sm), context))
110:                            failed = addFailedId(sm, failed);
111:                    } else if (!store.exists(sm, context))
112:                        failed = addFailedId(sm, failed);
113:                }
114:                return (failed == null) ? Collections.EMPTY_LIST : failed;
115:            }
116:
117:            /**
118:             * Add identity of given instance to collection.
119:             */
120:            private static Collection addFailedId(OpenJPAStateManager sm,
121:                    Collection failed) {
122:                if (failed == null)
123:                    failed = new ArrayList();
124:                failed.add(sm.getId());
125:                return failed;
126:            }
127:
128:            /**
129:             * Generate a value for the given metadata, or return null. Generates
130:             * values for hte following strategies: {@link ValueStrategies#SEQUENCE},
131:             * {@link ValueStrategies#UUID_STRING}, {@link ValueStrategies#UUID_HEX}
132:             */
133:            public static Object generateIdentityValue(StoreContext ctx,
134:                    ClassMetaData meta, int typeCode) {
135:                return generateValue(ctx, meta, null, typeCode);
136:            }
137:
138:            /**
139:             * Generate a value for the given metadata, or return null. Generates
140:             * values for hte following strategies: {@link ValueStrategies#SEQUENCE},
141:             * {@link ValueStrategies#UUID_STRING}, {@link ValueStrategies#UUID_HEX}
142:             */
143:            public static Object generateFieldValue(StoreContext ctx,
144:                    FieldMetaData fmd) {
145:                return generateValue(ctx, fmd.getDefiningMetaData(), fmd, fmd
146:                        .getDeclaredTypeCode());
147:            }
148:
149:            /**
150:             * Generate a value for the given metadaa.
151:             */
152:            private static Object generateValue(StoreContext ctx,
153:                    ClassMetaData meta, FieldMetaData fmd, int typeCode) {
154:                int strategy = (fmd == null) ? meta.getIdentityStrategy() : fmd
155:                        .getValueStrategy();
156:                switch (strategy) {
157:                case ValueStrategies.SEQUENCE:
158:                    SequenceMetaData smd = (fmd == null) ? meta
159:                            .getIdentitySequenceMetaData() : fmd
160:                            .getValueSequenceMetaData();
161:                    return JavaTypes.convert(smd.getInstance(
162:                            ctx.getClassLoader()).next(ctx, meta), typeCode);
163:                case ValueStrategies.UUID_STRING:
164:                    return UUIDGenerator.nextString();
165:                case ValueStrategies.UUID_HEX:
166:                    return UUIDGenerator.nextHex();
167:                default:
168:                    return null;
169:                }
170:            }
171:
172:            /**
173:             * Returns the fields of the state that require an update.
174:             *
175:             * @param  sm  the state to check
176:             * @return the BitSet of fields that need update, or null if none
177:             */
178:            public static BitSet getUpdateFields(OpenJPAStateManager sm) {
179:                if ((sm.getPCState() == PCState.PDIRTY && (!sm.isFlushed() || sm
180:                        .isFlushedDirty()))
181:                        || (sm.getPCState() == PCState.PNEW && sm
182:                                .isFlushedDirty())) {
183:                    BitSet dirty = sm.getDirty();
184:                    if (sm.isFlushed()) {
185:                        dirty = (BitSet) dirty.clone();
186:                        dirty.andNot(sm.getFlushed());
187:                    }
188:                    if (dirty.length() > 0)
189:                        return dirty;
190:                }
191:                return null;
192:            }
193:
194:            /**
195:             * Close the given resource. The resource can be an extent iterator,
196:             * query result, large result set relation, or any closeable OpenJPA
197:             * component.
198:             */
199:            public static void close(Object o) {
200:                try {
201:                    if (o instanceof  Closeable)
202:                        ((Closeable) o).close();
203:                } catch (RuntimeException re) {
204:                    throw re;
205:                } catch (Exception e) {
206:                    throw new GeneralException(e);
207:                }
208:            }
209:
210:            /**
211:             * Returns true if the specified class is a type that can be managed by
212:             * OpenJPA.
213:             *
214:             * @param type the class to test
215:             * @return true if the class is manageable.
216:             *
217:             * @since 1.0.0
218:             */
219:            public static boolean isManagedType(OpenJPAConfiguration conf,
220:                    Class type) {
221:                return (PersistenceCapable.class.isAssignableFrom(type) || (type != null
222:                        && (conf == null || conf
223:                                .getRuntimeUnenhancedClassesConstant() == RuntimeUnenhancedClasssesModes.SUPPORTED) && PCRegistry
224:                        .isRegistered(type)));
225:            }
226:
227:            /**
228:             * Returns true if the specified instance is manageable.
229:             *
230:             * @param instance the object to check
231:             * @return true if the instance is a persistent type, false otherwise
232:             */
233:            public static boolean isManageable(Object instance) {
234:                return instance instanceof  PersistenceCapable
235:                        || instance != null
236:                        && PCRegistry.isRegistered(instance.getClass());
237:            }
238:
239:            /**
240:             * Returns true if the referenced "to" class is assignable to the "from"
241:             * class.  This helper method utilizes a cache to help avoid the overhead
242:             * of the Class.isAssignableFrom() method.
243:             *
244:             * @param from target class instance to be checked for assignability
245:             * @param to second class instance to be checked for assignability
246:             * @return true if the "to" class is assignable to the "from" class
247:             */
248:            public static boolean isAssignable(Class from, Class to) {
249:                if (from == null || to == null)
250:                    return false;
251:
252:                Boolean isAssignable = null;
253:                Map assignableTo = (Map) _assignableTypes.get(from);
254:                if (assignableTo == null) { // "to" cache doesn't exist, so create it...
255:                    assignableTo = new ConcurrentReferenceHashMap(
256:                            ReferenceMap.WEAK, ReferenceMap.HARD);
257:                    _assignableTypes.put(from, assignableTo);
258:                } else { // "to" cache exists...
259:                    isAssignable = (Boolean) assignableTo.get(to);
260:                }
261:
262:                if (isAssignable == null) {// we don't have a record of this pair...
263:                    isAssignable = Boolean.valueOf(from.isAssignableFrom(to));
264:                    assignableTo.put(to, isAssignable);
265:                }
266:
267:                return isAssignable.booleanValue();
268:            }
269:
270:            /**
271:             * @return the persistence-capable instance responsible for managing
272:             * <code>o</code>, or <code>null</code> if <code>o</code> is not manageable.
273:             * @since 1.0.0
274:             */
275:            public static PersistenceCapable toPersistenceCapable(Object o,
276:                    Object ctx) {
277:                if (o instanceof  PersistenceCapable)
278:                    return (PersistenceCapable) o;
279:
280:                OpenJPAConfiguration conf = null;
281:                if (ctx instanceof  OpenJPAConfiguration)
282:                    conf = (OpenJPAConfiguration) ctx;
283:                else if (ctx instanceof  StateManager
284:                        && ((StateManager) ctx).getGenericContext() instanceof  StoreContext)
285:                    conf = ((StoreContext) ((StateManager) ctx)
286:                            .getGenericContext()).getConfiguration();
287:
288:                if (!isManageable(o))
289:                    return null;
290:
291:                // if we had a putIfAbsent() method, we wouldn't need to sync here
292:                synchronized (o) {
293:                    PersistenceCapable pc = (PersistenceCapable) _unenhancedInstanceMap
294:                            .get(o);
295:
296:                    if (pc != null)
297:                        return pc;
298:
299:                    // if we don't have a conf passed in, then we can't create a new
300:                    // ReflectingPC; this will only be the case when invoked from a
301:                    // context outside of OpenJPA.
302:                    if (conf == null)
303:                        return null;
304:
305:                    pc = new ReflectingPersistenceCapable(o, conf);
306:                    _unenhancedInstanceMap.put(o, pc);
307:                    return pc;
308:                }
309:            }
310:
311:            public static void registerPersistenceCapable(
312:                    ReflectingPersistenceCapable pc) {
313:                _unenhancedInstanceMap.put(pc.getManagedInstance(), pc);
314:            }
315:
316:            /**
317:             * @return the user-visible representation of <code>o</code>.
318:             * @since 1.0.0
319:             */
320:            public static Object getManagedInstance(Object o) {
321:                if (o instanceof  ManagedInstanceProvider)
322:                    return ((ManagedInstanceProvider) o).getManagedInstance();
323:                else
324:                    return o;
325:            }
326:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.