Source Code Cross Referenced for DataElementSerializer.java in  » 6.0-JDK-Modules » j2me » com » sun » kvem » jsr082 » bluetooth » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.kvem.jsr082.bluetooth 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:        package com.sun.kvem.jsr082.bluetooth;
027:
028:        import java.io.IOException;
029:        import java.util.Enumeration;
030:        import java.util.Stack;
031:        import javax.bluetooth.DataElement;
032:        import javax.bluetooth.ServiceRecord;
033:        import javax.bluetooth.UUID;
034:
035:        /**
036:         * Serializes and restores DataElement objects.
037:         */
038:        class DataElementSerializer {
039:            /** NULL data header. */
040:            private static final byte NULL_DATA = 0x00;
041:
042:            /** Boolean data header. */
043:            private static final byte BOOLEAN_DATA = 0x28;
044:
045:            /** 1-byte signed integer header. */
046:            private static final byte INT1_SIGNED = 0x10;
047:
048:            /** 2-byte signed integer header. */
049:            private static final byte INT2_SIGNED = 0x11;
050:
051:            /** 4-byte signed integer header. */
052:            private static final byte INT4_SIGNED = 0x12;
053:
054:            /** 8-byte signed integer header. */
055:            private static final byte INT8_SIGNED = 0x13;
056:
057:            /** 16-byte signed integer header. */
058:            private static final byte INT16_SIGNED = 0x14;
059:
060:            /** 1-byte unsigned integer header. */
061:            private static final byte INT1_UNSIGNED = 0x08;
062:
063:            /** 2-byte unsigned integer header. */
064:            private static final byte INT2_UNSIGNED = 0x09;
065:
066:            /** 4-byte unsigned integer header. */
067:            private static final byte INT4_UNSIGNED = 0x0a;
068:
069:            /** 8-byte unsigned integer header. */
070:            private static final byte INT8_UNSIGNED = 0x0b;
071:
072:            /** 16-byte unsigned integer header. */
073:            private static final byte INT16_UNSIGNED = 0x0c;
074:
075:            /** 16-bit UUID header. */
076:            private static final byte UUID_2 = 0x19;
077:
078:            /** 32-bit UUID header. */
079:            private static final byte UUID_4 = 0x1a;
080:
081:            /** 128-bit UUID header. */
082:            private static final byte UUID_16 = 0x1c;
083:
084:            /** Mask to get type tag from header. */
085:            private static final byte TYPE_MASK = ((byte) 0xf8);
086:
087:            /** Mask to get size of data size field from header. */
088:            private static final byte SIZE_MASK = 0x07;
089:
090:            /** Tag for string type. */
091:            private static final byte STRING_TYPE = 0x20;
092:
093:            /** Tag for sequence type. */
094:            private static final byte SEQUENCE_TYPE = 0x30;
095:
096:            /** Tag for an alternative type. */
097:            private static final byte ALTERNATIVE_TYPE = 0x38;
098:
099:            /** Tag that identifies that size of data size field is 2 bytes. */
100:            private static final byte SHORT_SIZE = 0x05;
101:
102:            /** Tag that identifies that size of data size field is 4 bytes. */
103:            private static final byte NORMAL_SIZE = 0x06;
104:
105:            /** Tag that identifies that size of data size field is 8 bytes. */
106:            private static final byte LONG_SIZE = 0x07;
107:
108:            /** Destination buffer which collects binary data of a data element. */
109:            protected byte[] writeBuffer = null;
110:
111:            /** Source buffer which contains binary data of a data element. */
112:            protected byte[] readBuffer = null;
113:
114:            /** Current position at the destination buffer. */
115:            protected long writePos = 0;
116:
117:            /** Current position at the source buffer. */
118:            protected long readPos = 0;
119:
120:            /** Allows to store and retrieve positions at the source buffer. */
121:            private Stack readPosStack = new Stack();
122:
123:            /**
124:             * Constructs the serializer object.
125:             */
126:            DataElementSerializer() {
127:            }
128:
129:            /**
130:             * Serializes given DataElement object, i.e. creates an array of bytes
131:             * representing DataElement as described in Bluetooth Specification
132:             * Version 1.2, vol 3, page 127.
133:             *
134:             * @param data the data element to serialize
135:             * @return an array containing the serialized data element
136:             * @throws IOException if an I/O error occurs
137:             */
138:            public synchronized byte[] serialize(DataElement data)
139:                    throws IOException {
140:                writeBuffer = new byte[(int) getDataSize(data)];
141:                writePos = 0;
142:                writeDataElement(data);
143:                byte[] result = writeBuffer;
144:                writeBuffer = null;
145:                return result;
146:            }
147:
148:            /**
149:             * Constructs DataElement from byte array containing the element in
150:             * serialized form.
151:             *
152:             * @param data byte array containing the element in serialized form
153:             * @return DataElement constructed from the binary data
154:             * @throws IOException if an I/O error occurs
155:             */
156:            public synchronized DataElement restore(byte[] data)
157:                    throws IOException {
158:                readBuffer = data;
159:                readPos = 0;
160:                DataElement result = readDataElement();
161:                readBuffer = null;
162:                return result;
163:            }
164:
165:            /**
166:             * Returns the size of DataElement with service information
167:             * to get the total size required to work with this DataElement.
168:             *
169:             * @param data the data element to get packet size for
170:             * @return number of bytes needed to store given data element
171:             */
172:            long getDataSize(DataElement data) {
173:                int type = data.getDataType();
174:                long size = getPureDataSize(data);
175:                if ((type == DataElement.NULL) || (type == DataElement.BOOL)
176:                        || (type == DataElement.INT_1)
177:                        || (type == DataElement.U_INT_1)
178:                        || (type == DataElement.INT_2)
179:                        || (type == DataElement.U_INT_2)
180:                        || (type == DataElement.INT_4)
181:                        || (type == DataElement.U_INT_4)
182:                        || (type == DataElement.INT_8)
183:                        || (type == DataElement.U_INT_8)
184:                        || (type == DataElement.INT_16)
185:                        || (type == DataElement.U_INT_16)
186:                        || (type == DataElement.UUID)) {
187:                    return size + 1;
188:                } else if ((type == DataElement.DATSEQ)
189:                        || (type == DataElement.DATALT)
190:                        || (type == DataElement.STRING)
191:                        || (type == DataElement.URL)) {
192:                    if (size <= 0xffL) {
193:                        return size + 2;
194:                    } else if (size <= 0xffffL) {
195:                        return size + 3;
196:                    } else if (size <= 0xffffffffL) {
197:                        return size + 5;
198:                    } else {
199:                        throw new RuntimeException("Data size is too large.");
200:                    }
201:                } else {
202:                    throw new RuntimeException("Unexpected data type.");
203:                }
204:            }
205:
206:            /**
207:             * Returns the size of DataElement without service information.
208:             *
209:             * @param data the data element to get pure data size for
210:             * @return pure data size in bytes
211:             */
212:            long getPureDataSize(DataElement data) {
213:                switch (data.getDataType()) {
214:                case DataElement.NULL:
215:                    return 0;
216:                case DataElement.BOOL:
217:                case DataElement.INT_1:
218:                case DataElement.U_INT_1:
219:                    return 1;
220:                case DataElement.INT_2:
221:                case DataElement.U_INT_2:
222:                    return 2;
223:                case DataElement.INT_4:
224:                case DataElement.U_INT_4:
225:                    return 4;
226:                case DataElement.INT_8:
227:                case DataElement.U_INT_8:
228:                    return 8;
229:                case DataElement.INT_16:
230:                case DataElement.U_INT_16:
231:                    return 16;
232:                case DataElement.DATSEQ:
233:                case DataElement.DATALT:
234:                    long size = 0;
235:                    Enumeration elements = (Enumeration) data.getValue();
236:                    while (elements.hasMoreElements()) {
237:                        size += getDataSize((DataElement) elements
238:                                .nextElement());
239:                    }
240:                    return size;
241:                case DataElement.STRING:
242:                case DataElement.URL:
243:                    return ((String) data.getValue()).length();
244:                case DataElement.UUID:
245:                    return 16;
246:                default:
247:                    throw new RuntimeException("Unknown data type.");
248:                }
249:            }
250:
251:            /**
252:             * Writes given data element into the write buffer.
253:             *
254:             * @param data the data element to write
255:             * @throws IOException if an I/O error occurs
256:             */
257:            void writeDataElement(DataElement data) throws IOException {
258:                long size = getPureDataSize(data);
259:                int type = data.getDataType();
260:                byte typeBits = 0x00;
261:                if ((type == DataElement.NULL) || (type == DataElement.BOOL)
262:                        || (type == DataElement.INT_1)
263:                        || (type == DataElement.U_INT_1)
264:                        || (type == DataElement.INT_2)
265:                        || (type == DataElement.U_INT_2)
266:                        || (type == DataElement.INT_4)
267:                        || (type == DataElement.U_INT_4)
268:                        || (type == DataElement.INT_8)
269:                        || (type == DataElement.U_INT_8)
270:                        || (type == DataElement.INT_16)
271:                        || (type == DataElement.U_INT_16)) {
272:                    switch (type) {
273:                    case DataElement.NULL:
274:                        writeByte(NULL_DATA);
275:                        break;
276:                    case DataElement.BOOL:
277:                        writeByte(BOOLEAN_DATA);
278:                        writeBoolean(data.getBoolean());
279:                        break;
280:                    case DataElement.INT_1:
281:                        writeByte(INT1_SIGNED);
282:                        writeByte((byte) data.getLong());
283:                        break;
284:                    case DataElement.U_INT_1:
285:                        writeByte(INT1_UNSIGNED);
286:                        writeByte((byte) data.getLong());
287:                        break;
288:                    case DataElement.INT_2:
289:                        writeByte(INT2_SIGNED);
290:                        writeShort((short) data.getLong());
291:                        break;
292:                    case DataElement.U_INT_2:
293:                        writeByte(INT2_UNSIGNED);
294:                        writeShort((short) data.getLong());
295:                        break;
296:                    case DataElement.INT_4:
297:                        writeByte(INT4_SIGNED);
298:                        writeInteger((int) data.getLong());
299:                        break;
300:                    case DataElement.U_INT_4:
301:                        writeByte(INT4_UNSIGNED);
302:                        writeInteger((int) data.getLong());
303:                        break;
304:                    case DataElement.INT_8:
305:                        writeByte(INT8_SIGNED);
306:                        writeLong(data.getLong());
307:                        break;
308:                    case DataElement.U_INT_8:
309:                        writeByte(INT8_UNSIGNED);
310:                        writeBytes((byte[]) data.getValue());
311:                        break;
312:                    case DataElement.INT_16:
313:                        writeByte(INT16_SIGNED);
314:                        writeBytes((byte[]) data.getValue());
315:                        break;
316:                    case DataElement.U_INT_16:
317:                        writeByte(INT16_UNSIGNED);
318:                        writeBytes((byte[]) data.getValue());
319:                        break;
320:                    }
321:                } else if ((type == DataElement.DATSEQ)
322:                        || (type == DataElement.DATALT)
323:                        || (type == DataElement.STRING)
324:                        || (type == DataElement.URL)) {
325:                    switch (type) {
326:                    case DataElement.DATSEQ:
327:                        typeBits = (TYPE_MASK & SEQUENCE_TYPE);
328:                        break;
329:                    case DataElement.DATALT:
330:                        typeBits = (TYPE_MASK & ALTERNATIVE_TYPE);
331:                        break;
332:                    case DataElement.STRING:
333:                    case DataElement.URL:
334:                        typeBits = (TYPE_MASK & STRING_TYPE);
335:                        break;
336:                    }
337:                    if (size <= 0xff) {
338:                        writeByte(typeBits | (SIZE_MASK & SHORT_SIZE));
339:                        writeByte((byte) size);
340:                    } else if (size <= 0xffff) {
341:                        writeByte(typeBits | (SIZE_MASK & NORMAL_SIZE));
342:                        writeShort((short) size);
343:                    } else {
344:                        writeByte(typeBits | (SIZE_MASK & LONG_SIZE));
345:                        writeInteger((int) size);
346:                    }
347:                    if ((type == DataElement.DATSEQ)
348:                            || (type == DataElement.DATALT)) {
349:                        Enumeration elements = (Enumeration) data.getValue();
350:                        while (elements.hasMoreElements()) {
351:                            writeDataElement((DataElement) elements
352:                                    .nextElement());
353:                        }
354:                    } else {
355:                        writeBytes(((String) data.getValue()).getBytes());
356:                    }
357:                } else if (type == DataElement.UUID) {
358:                    writeByte(UUID_16);
359:                    String uuid = ((UUID) data.getValue()).toString();
360:                    while (uuid.length() < 32) {
361:                        uuid = '0' + uuid;
362:                    }
363:                    for (int i = 0; i < 16; i++) {
364:                        writeByte(Integer.parseInt(uuid.substring(i * 2,
365:                                i * 2 + 2), 16));
366:                    }
367:                } else {
368:                    throw new RuntimeException("Unknown data type.");
369:                }
370:            }
371:
372:            /**
373:             * Creates a data element from the binary data in the read buffer.
374:             *
375:             * @return <code>DataElement</code> read
376:             * @throws IOException if an I/O error occurs
377:             */
378:            DataElement readDataElement() throws IOException {
379:                byte header = readByte();
380:                if ((header == NULL_DATA) || (header == BOOLEAN_DATA)
381:                        || (header == INT1_SIGNED) || (header == INT1_UNSIGNED)
382:                        || (header == INT2_SIGNED) || (header == INT2_UNSIGNED)
383:                        || (header == INT4_SIGNED) || (header == INT4_UNSIGNED)
384:                        || (header == INT8_SIGNED) || (header == INT8_UNSIGNED)
385:                        || (header == INT16_SIGNED)
386:                        || (header == INT16_UNSIGNED)) {
387:                    switch (header) {
388:                    case NULL_DATA:
389:                        return new DataElement(DataElement.NULL);
390:                    case BOOLEAN_DATA:
391:                        return new DataElement(readBoolean());
392:                    case INT1_SIGNED:
393:                        return new DataElement(DataElement.INT_1, readByte());
394:                    case INT1_UNSIGNED:
395:                        return new DataElement(DataElement.U_INT_1,
396:                                (readByte() & 0xffL));
397:                    case INT2_SIGNED:
398:                        return new DataElement(DataElement.INT_2, readShort());
399:                    case INT2_UNSIGNED:
400:                        return new DataElement(DataElement.U_INT_2,
401:                                (readShort() & 0xffffL));
402:                    case INT4_SIGNED:
403:                        return new DataElement(DataElement.INT_4, readInteger());
404:                    case INT4_UNSIGNED:
405:                        return new DataElement(DataElement.U_INT_4,
406:                                (readInteger() & 0xffffffffL));
407:                    case INT8_SIGNED:
408:                        return new DataElement(DataElement.INT_8, readLong());
409:                    case INT8_UNSIGNED:
410:                        return new DataElement(DataElement.U_INT_8,
411:                                readBytes(8));
412:                    case INT16_SIGNED:
413:                        return new DataElement(DataElement.INT_16,
414:                                readBytes(16));
415:                    case INT16_UNSIGNED:
416:                        return new DataElement(DataElement.U_INT_16,
417:                                readBytes(16));
418:                    }
419:                } else if (((header & TYPE_MASK) == STRING_TYPE)
420:                        || ((header & TYPE_MASK) == SEQUENCE_TYPE)
421:                        || ((header & TYPE_MASK) == ALTERNATIVE_TYPE)) {
422:                    long size = 0;
423:                    if ((header & SIZE_MASK) == SHORT_SIZE) {
424:                        size = readByte() & 0xffL;
425:                    } else if ((header & SIZE_MASK) == NORMAL_SIZE) {
426:                        size = readShort() & 0xffffL;
427:                    } else if ((header & SIZE_MASK) == LONG_SIZE) {
428:                        size = readInteger() & 0xffffffffL;
429:                    } else {
430:                        System.err.println("Unknown size mask.");
431:                    }
432:                    if ((header & TYPE_MASK) == STRING_TYPE) {
433:                        return new DataElement(DataElement.STRING, new String(
434:                                readBytes((int) size)));
435:                    } else {
436:                        DataElement data = null;
437:                        DataElement dataElement = null;
438:                        long dataPos = 0;
439:                        if ((header & TYPE_MASK) == SEQUENCE_TYPE) {
440:                            data = new DataElement(DataElement.DATSEQ);
441:                        } else {
442:                            data = new DataElement(DataElement.DATALT);
443:                        }
444:                        while (dataPos < size) {
445:                            pushReadPos();
446:                            dataElement = readDataElement();
447:                            dataPos += readPos - popReadPos();
448:                            data.addElement(dataElement);
449:                        }
450:                        return data;
451:                    }
452:                } else if (header == UUID_2) {
453:                    return new DataElement(DataElement.UUID, readUUID(2));
454:                } else if (header == UUID_4) {
455:                    return new DataElement(DataElement.UUID, readUUID(4));
456:                } else if (header == UUID_16) {
457:                    return new DataElement(DataElement.UUID, readUUID(16));
458:                } else {
459:                    throw new RuntimeException("Unknown data type.");
460:                }
461:                return null;
462:            }
463:
464:            /**
465:             * Writes boolean data to the buffer.
466:             * Writes only value given itself. Note that boolean data header
467:             * should be written before.
468:             *
469:             * @param data boolean value to write.
470:             * @throws IOException if an I/O error occurs
471:             */
472:            void writeBoolean(boolean data) throws IOException {
473:                writeByte(data ? 1 : 0);
474:            }
475:
476:            /**
477:             * Writes 1-byte data to the buffer.
478:             *
479:             * @param data byte value to write.
480:             * @throws IOException if an I/O error occurs
481:             */
482:            void writeByte(long data) throws IOException {
483:                if (writePos < 0 || writePos >= writeBuffer.length) {
484:                    throw new IndexOutOfBoundsException();
485:                }
486:                writeBuffer[(int) writePos++] = (byte) data;
487:            }
488:
489:            /**
490:             * Writes 2-byte data to the buffer.
491:             *
492:             * @param data 2-byte value to write.
493:             * @throws IOException if an I/O error occurs
494:             */
495:            void writeShort(short data) throws IOException {
496:                writeByte((byte) ((data >>> 8) & 0xff));
497:                writeByte((byte) ((data >>> 0) & 0xff));
498:            }
499:
500:            /**
501:             * Writes 4-byte data to the connection.
502:             *
503:             * @param data 4-byte value to write.
504:             * @throws IOException if an I/O error occurs
505:             */
506:            void writeInteger(int data) throws IOException {
507:                writeShort((short) ((data >>> 16) & 0xffff));
508:                writeShort((short) ((data >>> 0) & 0xffff));
509:            }
510:
511:            /**
512:             * Writes 8-byte data to the connection.
513:             *
514:             * @param data 8-byte value to write.
515:             * @throws IOException if an I/O error occurs
516:             */
517:            void writeLong(long data) throws IOException {
518:                writeInteger((int) ((data >>> 32) & 0xffffffff));
519:                writeInteger((int) ((data >>> 0) & 0xffffffff));
520:            }
521:
522:            /**
523:             * Writes given data to the connection.
524:             *
525:             * @param data bytes to write.
526:             * @throws IOException if an I/O error occurs
527:             */
528:            void writeBytes(byte[] data) throws IOException {
529:                if (writePos < 0 || writePos + data.length > writeBuffer.length) {
530:                    throw new IndexOutOfBoundsException();
531:                }
532:                System.arraycopy(data, 0, writeBuffer, (int) writePos,
533:                        data.length);
534:                writePos += data.length;
535:            }
536:
537:            /**
538:             * Reads boolean value from the connection.
539:             *
540:             * @return boolean value recieved.
541:             * @throws IOException if an I/O error occurs
542:             */
543:            boolean readBoolean() throws IOException {
544:                return (readByte() != 0);
545:            }
546:
547:            /**
548:             * Reads 1-byte value from the connection.
549:             *
550:             * @return byte recieved.
551:             * @throws IOException if an I/O error occurs
552:             */
553:            byte readByte() throws IOException {
554:                if (readPos < 0 || readPos >= readBuffer.length) {
555:                    throw new IndexOutOfBoundsException();
556:                }
557:                return readBuffer[(int) readPos++];
558:            }
559:
560:            /**
561:             * Reads 2-byte value from the connection.
562:             *
563:             * @return short which is the 2 bytes read.
564:             * @throws IOException if an I/O error occurs
565:             */
566:            short readShort() throws IOException {
567:                int data1 = ((int) readByte()) & 0xff;
568:                int data2 = ((int) readByte()) & 0xff;
569:                return (short) ((data1 << 8) + (data2 << 0));
570:            }
571:
572:            /**
573:             * Reads 4-byte value from the connection.
574:             *
575:             * @return int which is the 4 bytes read.
576:             * @throws IOException if an I/O error occurs
577:             */
578:            int readInteger() throws IOException {
579:                int data1 = ((int) readShort()) & 0xffff;
580:                int data2 = ((int) readShort()) & 0xffff;
581:                return ((data1 << 16) + (data2 << 0));
582:            }
583:
584:            /**
585:             * Reads 8-byte value from the connection.
586:             *
587:             * @return long which is the 8 bytes read.
588:             * @throws IOException if an I/O error occurs
589:             */
590:            long readLong() throws IOException {
591:                long data1 = ((long) readInteger()) & 0xffffffffL;
592:                long data2 = ((long) readInteger()) & 0xffffffffL;
593:                return ((data1 << 32) + (data2 << 0));
594:            }
595:
596:            /**
597:             * Reads given number of bytes from the connection.
598:             *
599:             * @param size number of bytes to read.
600:             * @return array of bytes read.
601:             * @throws IOException if an I/O error occurs
602:             */
603:            byte[] readBytes(int size) throws IOException {
604:                byte[] data = new byte[size];
605:                int dataPos = 0;
606:                if (readPos < 0 || readPos + data.length > readBuffer.length) {
607:                    throw new IndexOutOfBoundsException();
608:                }
609:                System.arraycopy(readBuffer, (int) readPos, data, 0,
610:                        data.length);
611:                readPos += data.length;
612:                return data;
613:            }
614:
615:            /**
616:             * Reads UUID of a given size.
617:             *
618:             * @param len number of bytes to read
619:             * @return UUID created from <code>len</code> bytes
620:             * @throws IOException if an I/O error occurs
621:             */
622:            UUID readUUID(int len) throws IOException {
623:                String uuid = "";
624:                for (int i = 0; i < len; i++) {
625:                    String digit = Integer.toHexString(readByte() & 0xff);
626:                    if (digit.length() == 1)
627:                        digit = '0' + digit;
628:                    uuid += digit;
629:                }
630:                return new UUID(uuid, len < 16);
631:            }
632:
633:            /** Saves the current read position. */
634:            private void pushReadPos() {
635:                readPosStack.push(new Long(readPos));
636:            }
637:
638:            /** Extracts saved read position. */
639:            private long popReadPos() {
640:                return ((Long) readPosStack.pop()).longValue();
641:            }
642:
643:        }
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