Source Code Cross Referenced for SerialVersionUID.java in  » Database-DBMS » db4o-6.4 » EDU » purdue » cs » bloat » editor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.editor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
002:
003:        This file is part of the db4o open source object database.
004:
005:        db4o is free software; you can redistribute it and/or modify it under
006:        the terms of version 2 of the GNU General Public License as published
007:        by the Free Software Foundation and as clarified by db4objects' GPL 
008:        interpretation policy, available at
009:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011:        Suite 350, San Mateo, CA 94403, USA.
012:
013:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:        for more details.
017:
018:        You should have received a copy of the GNU General Public License along
019:        with this program; if not, write to the Free Software Foundation, Inc.,
020:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
021:        package EDU.purdue.cs.bloat.editor;
022:
023:        import java.io.*;
024:        import java.lang.reflect.*;
025:        import java.security.*;
026:        import java.util.*;
027:
028:        import EDU.purdue.cs.bloat.reflect.*;
029:
030:        /**
031:         * <P>
032:         * This class computes the serial version UID of a class modeled by a
033:         * <code>ClassEditor</code>. Otherwise, we would have to load the class in
034:         * order to compute its serial version UID. That would suck.
035:         * </P>
036:         * 
037:         * <P>
038:         * The algorithm for computing the serial version UID can be found in the <A
039:         * href="http://java.sun.com/j2se/1.3/docs/guide/serialization/spec">serialization
040:         * spec</A>
041:         * </P>
042:         */
043:        public class SerialVersionUID {
044:
045:            /**
046:             * Returns <code>true</code> if the class modeled by the given
047:             * <code>ClassEditor</code> implements {@link java.io.Serializable
048:             * Serializable}. It checks superclasses.
049:             */
050:            public static boolean implements Serializable(final ClassEditor ce) {
051:                if (ce.type().equals(Type.OBJECT)) {
052:                    // Stop the recursion!
053:                    return (false);
054:                }
055:
056:                final Type serializable = Type
057:                        .getType("Ljava/io/Serializable;");
058:                final Type[] interfaces = ce.interfaces();
059:                for (int i = 0; i < interfaces.length; i++) {
060:                    if (interfaces[i].equals(serializable)) {
061:                        return (true);
062:                    }
063:                }
064:
065:                // Does its superclass implement Serializable?
066:
067:                final Type super class = ce.super class();
068:                final ClassInfoLoader loader = ce.classInfo().loader();
069:                try {
070:                    final ClassInfo ci = loader.loadClass(super class
071:                            .className());
072:                    final ClassEditor sce = new ClassEditor(ce.context(), ci);
073:                    return (SerialVersionUID.implements Serializable(sce));
074:
075:                } catch (final ClassNotFoundException ex) {
076:                    System.err.println("Could not load class: " + super class
077:                            + ", superclass of " + ce.name());
078:                    System.exit(1);
079:                }
080:                return (false);
081:            }
082:
083:            /**
084:             * Returns the serial version UID of the class modeled by the given
085:             * <code>ClassEditor</code>.
086:             * 
087:             * @param ce
088:             *            The class must implement {@link java.io.Serializable
089:             *            Serializable}
090:             */
091:            public static long serialVersionUID(final ClassEditor ce) {
092:                // Make sure the class implements Serializable
093:                if (!SerialVersionUID.implements Serializable(ce)) {
094:                    final String s = "Class " + ce.name()
095:                            + " does not implement java.io.Serializable";
096:                    throw new IllegalArgumentException(s);
097:                }
098:
099:                // If the class already has a serialVersionUID, return that
100:                final FieldInfo[] fields = ce.fields();
101:                for (int i = 0; i < fields.length; i++) {
102:                    final FieldEditor fe = new FieldEditor(ce, fields[i]);
103:                    if (fe.name().equals("serialVersionUID")) {
104:                        final Object value = fe.constantValue();
105:                        if (value != null) {
106:                            if (value instanceof  Long) {
107:                                return (((Long) value).longValue());
108:                            }
109:                        }
110:                    }
111:                }
112:
113:                // Now, compute the digest of the bytes using SHA
114:                MessageDigest algorithm = null;
115:                try {
116:                    algorithm = MessageDigest.getInstance("SHA");
117:
118:                } catch (final NoSuchAlgorithmException ex) {
119:                    final String s = "Can't use SHA-1 message digest algorith!";
120:                    throw new IllegalArgumentException(s);
121:                }
122:
123:                final DataOutputStream dos = new DataOutputStream(
124:                        new DigestOutputStream(new ByteArrayOutputStream(),
125:                                algorithm));
126:
127:                try {
128:                    // Write a bunch of information about the class to the output
129:                    // stream
130:                    SerialVersionUID.writeClassName(ce, dos);
131:                    SerialVersionUID.writeClassModifiers(ce, dos);
132:                    SerialVersionUID.writeInterfaceNames(ce, dos);
133:                    SerialVersionUID.writeFields(ce, dos);
134:                    SerialVersionUID.writeStaticInitializer(ce, dos);
135:                    SerialVersionUID.writeConstructors(ce, dos);
136:                    SerialVersionUID.writeMethods(ce, dos);
137:
138:                    dos.flush();
139:                    dos.close();
140:
141:                } catch (final IOException ex) {
142:                    final String s = ("While computing serial version UID: " + ex);
143:                    throw new IllegalArgumentException(s);
144:                }
145:
146:                // Compute the hash value from the first 64 bites of the digest
147:                final byte[] digest = algorithm.digest();
148:                long uid = 0;
149:                for (int i = 0; i < Math.min(8, digest.length); i++) {
150:                    uid += (long) (digest[i] & 255) << (i * 8);
151:                }
152:                return (uid);
153:
154:            }
155:
156:            /**
157:             * Writes the name of the class to the data output stream
158:             */
159:            private static void writeClassName(final ClassEditor ce,
160:                    final DataOutputStream dos) throws IOException {
161:                dos.writeUTF(ce.name().replace('/', '.'));
162:            }
163:
164:            /**
165:             * Returns the Java reflection modifiers for a given class
166:             */
167:            static int getModifiers(final ClassEditor ce) {
168:                // Translate BLOAT's class modifiers into Java's reflection
169:                // modifiers
170:                int modifiers = 0;
171:
172:                if (ce.isPublic()) {
173:                    modifiers |= Modifier.PUBLIC;
174:                }
175:
176:                if (ce.isPrivate()) {
177:                    modifiers |= Modifier.PRIVATE;
178:                }
179:
180:                if (ce.isProtected()) {
181:                    modifiers |= Modifier.PROTECTED;
182:                }
183:
184:                if (ce.isStatic()) {
185:                    modifiers |= Modifier.STATIC;
186:                }
187:
188:                if (ce.isFinal()) {
189:                    modifiers |= Modifier.FINAL;
190:                }
191:
192:                if (ce.isAbstract()) {
193:                    modifiers |= Modifier.ABSTRACT;
194:                }
195:
196:                if (ce.isInterface()) {
197:                    modifiers |= Modifier.INTERFACE;
198:                }
199:
200:                return (modifiers);
201:            }
202:
203:            /**
204:             * Writes the class's modifiers to the output stream
205:             */
206:            private static void writeClassModifiers(final ClassEditor ce,
207:                    final DataOutputStream dos) throws IOException {
208:                dos.writeInt(SerialVersionUID.getModifiers(ce));
209:            }
210:
211:            /**
212:             * Writes the names of the interfaces implemented by the class to the output
213:             * stream
214:             */
215:            private static void writeInterfaceNames(final ClassEditor ce,
216:                    final DataOutputStream dos) throws IOException {
217:
218:                // Sort interfaces by name
219:                final SortedSet sorted = new TreeSet();
220:
221:                final Type[] interfaces = ce.interfaces();
222:                for (int i = 0; i < interfaces.length; i++) {
223:                    sorted.add(interfaces[i].className().replace('/', '.'));
224:                }
225:
226:                final Iterator iter = sorted.iterator();
227:                while (iter.hasNext()) {
228:                    final String name = (String) iter.next();
229:                    dos.writeUTF(name);
230:                }
231:
232:            }
233:
234:            /**
235:             * Returns the Java reflection modifiers for a field
236:             */
237:            static int getModifiers(final FieldEditor fe) {
238:                int modifiers = 0;
239:
240:                if (fe.isPublic()) {
241:                    modifiers |= Modifier.PUBLIC;
242:                }
243:
244:                if (fe.isPrivate()) {
245:                    modifiers |= Modifier.PRIVATE;
246:                }
247:
248:                if (fe.isProtected()) {
249:                    modifiers |= Modifier.PROTECTED;
250:                }
251:
252:                if (fe.isPackage()) {
253:                    // Nothing
254:                }
255:
256:                if (fe.isStatic()) {
257:                    modifiers |= Modifier.STATIC;
258:                }
259:
260:                if (fe.isFinal()) {
261:                    modifiers |= Modifier.FINAL;
262:                }
263:
264:                if (fe.isVolatile()) {
265:                    modifiers |= Modifier.VOLATILE;
266:                }
267:
268:                if (fe.isTransient()) {
269:                    // Kind of a moot point
270:                    modifiers |= Modifier.TRANSIENT;
271:                }
272:
273:                return (modifiers);
274:            }
275:
276:            /**
277:             * Writes information about the class's fields to the output stream
278:             */
279:            private static void writeFields(final ClassEditor ce,
280:                    final DataOutputStream dos) throws IOException {
281:
282:                // Sort the fields by their names
283:                final SortedSet sorted = new TreeSet(new Comparator() {
284:                    public int compare(Object o1, Object o2) {
285:                        FieldEditor fe1 = (FieldEditor) o1;
286:                        FieldEditor fe2 = (FieldEditor) o2;
287:                        return (fe1.name().compareTo(fe2.name()));
288:                    }
289:                });
290:
291:                final FieldInfo[] infos = ce.fields();
292:                for (int i = 0; i < infos.length; i++) {
293:                    final FieldEditor fe = new FieldEditor(ce, infos[i]);
294:                    // Ignore private static and private transient fields
295:                    if (fe.isPrivate() && fe.isStatic()) {
296:                        break;
297:
298:                    } else if (fe.isPrivate() && fe.isTransient()) {
299:                        break;
300:
301:                    } else {
302:                        sorted.add(fe);
303:                    }
304:                }
305:
306:                final Iterator iter = sorted.iterator();
307:                while (iter.hasNext()) {
308:                    final FieldEditor fe = (FieldEditor) iter.next();
309:                    dos.writeUTF(fe.name());
310:                    dos.writeInt(SerialVersionUID.getModifiers(fe));
311:                    dos.writeUTF(fe.type().descriptor());
312:                }
313:            }
314:
315:            /**
316:             * Returns the Java reflection descriptors for a method
317:             */
318:            static int getModifiers(final MethodEditor me) {
319:                int modifiers = 0;
320:
321:                if (me.isPublic()) {
322:                    modifiers |= Modifier.PUBLIC;
323:                }
324:
325:                if (me.isPrivate()) {
326:                    modifiers |= Modifier.PRIVATE;
327:                }
328:
329:                if (me.isProtected()) {
330:                    modifiers |= Modifier.PROTECTED;
331:                }
332:
333:                if (me.isPackage()) {
334:                    // Nothing
335:                }
336:
337:                if (me.isStatic()) {
338:                    modifiers |= Modifier.STATIC;
339:                }
340:
341:                if (me.isFinal()) {
342:                    modifiers |= Modifier.FINAL;
343:                }
344:
345:                if (me.isSynchronized()) {
346:                    modifiers |= Modifier.SYNCHRONIZED;
347:                }
348:
349:                if (me.isNative()) {
350:                    modifiers |= Modifier.NATIVE;
351:                }
352:
353:                if (me.isAbstract()) {
354:                    modifiers |= Modifier.ABSTRACT;
355:                }
356:
357:                if (me.isInterface()) {
358:                    modifiers |= Modifier.INTERFACE;
359:                }
360:
361:                return (modifiers);
362:            }
363:
364:            /**
365:             * Writes information about the classes static initializer if it has one
366:             */
367:            private static void writeStaticInitializer(final ClassEditor ce,
368:                    final DataOutputStream dos) throws IOException {
369:
370:                MethodEditor clinit = null;
371:
372:                final MethodInfo[] methods = ce.methods();
373:                for (int i = 0; i < methods.length; i++) {
374:                    final MethodEditor me = new MethodEditor(ce, methods[i]);
375:                    if (me.name().equals("<clinit>")) {
376:                        clinit = me;
377:                        break;
378:                    }
379:                }
380:
381:                if (clinit != null) {
382:                    dos.writeUTF("<clinit>");
383:                    dos.writeInt(Modifier.STATIC);
384:                    dos.writeUTF("()V");
385:                }
386:            }
387:
388:            /**
389:             * Writes information about the class's constructors
390:             */
391:            private static void writeConstructors(final ClassEditor ce,
392:                    final DataOutputStream dos) throws IOException {
393:
394:                // Sort constructors by their signatures
395:                final SortedSet sorted = new TreeSet(new Comparator() {
396:                    public int compare(Object o1, Object o2) {
397:                        MethodEditor me1 = (MethodEditor) o1;
398:                        MethodEditor me2 = (MethodEditor) o2;
399:                        return (me1.type().descriptor().compareTo(me2.type()
400:                                .descriptor()));
401:                    }
402:                });
403:
404:                final MethodInfo[] methods = ce.methods();
405:                for (int i = 0; i < methods.length; i++) {
406:                    final MethodEditor me = new MethodEditor(ce, methods[i]);
407:                    if (me.name().equals("<init>")) {
408:                        if (!me.isPrivate()) {
409:                            // Ignore private constructors
410:                            sorted.add(me);
411:                        }
412:                    }
413:                }
414:
415:                final Iterator iter = sorted.iterator();
416:                while (iter.hasNext()) {
417:                    final MethodEditor init = (MethodEditor) iter.next();
418:                    dos.writeUTF("<init>");
419:                    dos.writeInt(SerialVersionUID.getModifiers(init));
420:                    dos.writeUTF(init.type().descriptor());
421:                }
422:            }
423:
424:            /**
425:             * Write information about the class's methods
426:             */
427:            private static void writeMethods(final ClassEditor ce,
428:                    final DataOutputStream dos) throws IOException {
429:
430:                // Sort constructors by their names and signatures
431:                final SortedSet sorted = new TreeSet(new Comparator() {
432:                    public int compare(Object o1, Object o2) {
433:                        MethodEditor me1 = (MethodEditor) o1;
434:                        MethodEditor me2 = (MethodEditor) o2;
435:
436:                        String d1 = me1.name() + me1.type().descriptor();
437:                        String d2 = me2.name() + me2.type().descriptor();
438:                        return (d1.compareTo(d2));
439:                    }
440:                });
441:
442:                final MethodInfo[] methods = ce.methods();
443:                for (int i = 0; i < methods.length; i++) {
444:                    final MethodEditor me = new MethodEditor(ce, methods[i]);
445:                    if (!me.isPrivate() && !me.isConstructor()
446:                            && !me.name().equals("<clinit>")) {
447:                        // Ignore private methods
448:                        sorted.add(me);
449:                    }
450:                }
451:
452:                final Iterator iter = sorted.iterator();
453:                while (iter.hasNext()) {
454:                    final MethodEditor me = (MethodEditor) iter.next();
455:                    dos.writeUTF(me.name());
456:                    dos.writeInt(SerialVersionUID.getModifiers(me));
457:                    dos.writeUTF(me.type().descriptor());
458:                }
459:
460:            }
461:
462:        }
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