Source Code Cross Referenced for StringConverter.java in  » Database-DBMS » hsql » org » hsqldb » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 1995-2000, The Hypersonic SQL Group.
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the Hypersonic SQL Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         *
030:         * This software consists of voluntary contributions made by many individuals 
031:         * on behalf of the Hypersonic SQL Group.
032:         *
033:         *
034:         * For work added by the HSQL Development Group:
035:         *
036:         * Copyright (c) 2001-2005, The HSQL Development Group
037:         * All rights reserved.
038:         *
039:         * Redistribution and use in source and binary forms, with or without
040:         * modification, are permitted provided that the following conditions are met:
041:         *
042:         * Redistributions of source code must retain the above copyright notice, this
043:         * list of conditions and the following disclaimer.
044:         *
045:         * Redistributions in binary form must reproduce the above copyright notice,
046:         * this list of conditions and the following disclaimer in the documentation
047:         * and/or other materials provided with the distribution.
048:         *
049:         * Neither the name of the HSQL Development Group nor the names of its
050:         * contributors may be used to endorse or promote products derived from this
051:         * software without specific prior written permission.
052:         *
053:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
054:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
055:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
056:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
057:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
060:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
061:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
062:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064:         */
065:
066:        package org.hsqldb.lib;
067:
068:        import java.io.IOException;
069:        import java.io.InputStream;
070:        import java.io.InputStreamReader;
071:        import java.io.StringWriter;
072:        import java.io.UTFDataFormatException;
073:
074:        /**
075:         * Collection of static methods for converting strings between different
076:         * formats and to and from byte arrays.<p>
077:         *
078:         * New class, with extensively enhanced and rewritten Hypersonic code.
079:         *
080:         * @author Thomas Mueller (Hypersonic SQL Group)
081:         * @author fredt@users
082:         * @version 1.8.0
083:         * @since 1.7.2
084:         */
085:
086:        // fredt@users 20020328 - patch 1.7.0 by fredt - error trapping
087:        public class StringConverter {
088:
089:            private static final byte[] HEXBYTES = { (byte) '0', (byte) '1',
090:                    (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6',
091:                    (byte) '7', (byte) '8', (byte) '9', (byte) 'a', (byte) 'b',
092:                    (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f' };
093:            private static final String HEXINDEX = "0123456789abcdef0123456789ABCDEF";
094:
095:            /**
096:             * Converts a String into a byte array by using a big-endian two byte
097:             * representation of each char value in the string.
098:             */
099:            byte[] stringToFullByteArray(String s) {
100:
101:                int length = s.length();
102:                byte[] buffer = new byte[length * 2];
103:                int c;
104:
105:                for (int i = 0; i < length; i++) {
106:                    c = s.charAt(i);
107:                    buffer[i * 2] = (byte) ((c & 0x0000ff00) >> 8);
108:                    buffer[i * 2 + 1] = (byte) (c & 0x000000ff);
109:                }
110:
111:                return buffer;
112:            }
113:
114:            /**
115:             * Compacts a hexadecimal string into a byte array
116:             *
117:             *
118:             * @param s hexadecimal string
119:             *
120:             * @return byte array for the hex string
121:             * @throws IOException
122:             */
123:            public static byte[] hexToByte(String s) throws IOException {
124:
125:                int l = s.length() / 2;
126:                byte[] data = new byte[l];
127:                int j = 0;
128:
129:                if (s.length() % 2 != 0) {
130:                    throw new IOException(
131:                            "hexadecimal string with odd number of characters");
132:                }
133:
134:                for (int i = 0; i < l; i++) {
135:                    char c = s.charAt(j++);
136:                    int n, b;
137:
138:                    n = HEXINDEX.indexOf(c);
139:
140:                    if (n == -1) {
141:                        throw new IOException(
142:                                "hexadecimal string contains non hex character");
143:                    }
144:
145:                    b = (n & 0xf) << 4;
146:                    c = s.charAt(j++);
147:                    n = HEXINDEX.indexOf(c);
148:                    b += (n & 0xf);
149:                    data[i] = (byte) b;
150:                }
151:
152:                return data;
153:            }
154:
155:            /**
156:             * Converts a byte array into a hexadecimal string
157:             *
158:             *
159:             * @param b byte array
160:             *
161:             * @return hex string
162:             */
163:            public static String byteToHex(byte[] b) {
164:
165:                int len = b.length;
166:                char[] s = new char[len * 2];
167:
168:                for (int i = 0, j = 0; i < len; i++) {
169:                    int c = ((int) b[i]) & 0xff;
170:
171:                    s[j++] = (char) HEXBYTES[c >> 4 & 0xf];
172:                    s[j++] = (char) HEXBYTES[c & 0xf];
173:                }
174:
175:                return new String(s);
176:            }
177:
178:            /**
179:             * Converts a byte array into hexadecimal characters
180:             * which are written as ASCII to the given output stream.
181:             *
182:             * @param o output stream
183:             * @param b byte array
184:             */
185:            public static void writeHex(byte[] o, int from, byte[] b) {
186:
187:                int len = b.length;
188:
189:                for (int i = 0; i < len; i++) {
190:                    int c = ((int) b[i]) & 0xff;
191:
192:                    o[from++] = HEXBYTES[c >> 4 & 0xf];
193:                    o[from++] = HEXBYTES[c & 0xf];
194:                }
195:            }
196:
197:            public static String byteToString(byte[] b, String charset) {
198:
199:                try {
200:                    return (charset == null) ? new String(b) : new String(b,
201:                            charset);
202:                } catch (Exception e) {
203:                }
204:
205:                return null;
206:            }
207:
208:            /**
209:             * Converts a Unicode string into UTF8 then convert into a hex string
210:             *
211:             *
212:             * @param s normal Unicode string
213:             *
214:             * @return hex string representation of UTF8 encoding of the input
215:             */
216:            public static String unicodeToHexString(String s) {
217:
218:                HsqlByteArrayOutputStream bout = new HsqlByteArrayOutputStream();
219:
220:                writeUTF(s, bout);
221:
222:                return byteToHex(bout.toByteArray());
223:            }
224:
225:            // fredt@users 20011120 - patch 450455 by kibu@users - modified
226:            // method return type changed to HsqlStringBuffer with spare
227:            // space for end-of-line characters -- to reduce String concatenation
228:
229:            /**
230:             * Hsqldb specific encoding used only for log files.
231:             *
232:             * The SQL statements that need to be written to the log file (input) are
233:             * Java Unicode strings. input is converted into a 7bit escaped ASCII
234:             * string (output)with the following transformations.
235:             * All characters outside the 0x20-7f range are converted to a
236:             * escape sequence and added to output.
237:             * If a backslash character is immdediately followed by 'u', the
238:             * backslash character is converted to escape sequence and
239:             * added to output.
240:             * All the remaining characters in input are added to output without
241:             * conversion.
242:             *
243:             * The escape sequence is backslash, letter u, xxxx, where xxxx
244:             * is the hex representation of the character code.
245:             * (fredt@users)
246:             *
247:             * @param b output stream to wite to
248:             * @param s Java Unicode string
249:             *
250:             * @return number of bytes written out
251:             *
252:             */
253:            public static int unicodeToAscii(HsqlByteArrayOutputStream b,
254:                    String s, boolean doubleSingleQuotes) {
255:
256:                int count = 0;
257:
258:                if ((s == null) || (s.length() == 0)) {
259:                    return 0;
260:                }
261:
262:                int len = s.length();
263:
264:                for (int i = 0; i < len; i++) {
265:                    char c = s.charAt(i);
266:
267:                    if (c == '\\') {
268:                        if ((i < len - 1) && (s.charAt(i + 1) == 'u')) {
269:                            b.write(c); // encode the \ as unicode, so 'u' is ignored
270:                            b.write('u');
271:                            b.write('0');
272:                            b.write('0');
273:                            b.write('5');
274:                            b.write('c');
275:
276:                            count += 6;
277:                        } else {
278:                            b.write(c);
279:
280:                            count++;
281:                        }
282:                    } else if ((c >= 0x0020) && (c <= 0x007f)) {
283:                        b.write(c); // this is 99%
284:
285:                        count++;
286:
287:                        if (c == '\'' && doubleSingleQuotes) {
288:                            b.write(c);
289:
290:                            count++;
291:                        }
292:                    } else {
293:                        b.write('\\');
294:                        b.write('u');
295:                        b.write(HEXBYTES[(c >> 12) & 0xf]);
296:                        b.write(HEXBYTES[(c >> 8) & 0xf]);
297:                        b.write(HEXBYTES[(c >> 4) & 0xf]);
298:                        b.write(HEXBYTES[c & 0xf]);
299:
300:                        count += 6;
301:                    }
302:                }
303:
304:                return count;
305:            }
306:
307:            // fredt@users 20020522 - fix for 557510 - backslash bug
308:            // this legacy bug resulted from forward reading the input when a backslash
309:            // was present and manifested itself when a backslash was followed
310:            // immdediately by a character outside the 0x20-7f range in a database field.
311:
312:            /**
313:             * Hsqldb specific decoding used only for log files.
314:             *
315:             * This method converts the 7 bit escaped ASCII strings in a log file
316:             * back into Java Unicode strings. See unicodeToAccii() above,
317:             *
318:             * @param s encoded ASCII string in byte array
319:             * @param offset position of first byte
320:             * @param length number of bytes to use
321:             *
322:             * @return Java Unicode string
323:             */
324:            public static String asciiToUnicode(byte[] s, int offset, int length) {
325:
326:                if (length == 0) {
327:                    return "";
328:                }
329:
330:                char[] b = new char[length];
331:                int j = 0;
332:
333:                for (int i = 0; i < length; i++) {
334:                    byte c = s[offset + i];
335:
336:                    if (c == '\\' && i < length - 5) {
337:                        byte c1 = s[offset + i + 1];
338:
339:                        if (c1 == 'u') {
340:                            i++;
341:
342:                            // 4 characters read should always return 0-15
343:                            int k = HEXINDEX.indexOf(s[offset + (++i)]) << 12;
344:
345:                            k += HEXINDEX.indexOf(s[offset + (++i)]) << 8;
346:                            k += HEXINDEX.indexOf(s[offset + (++i)]) << 4;
347:                            k += HEXINDEX.indexOf(s[offset + (++i)]);
348:                            b[j++] = (char) k;
349:                        } else {
350:                            b[j++] = (char) c;
351:                        }
352:                    } else {
353:                        b[j++] = (char) c;
354:                    }
355:                }
356:
357:                return new String(b, 0, j);
358:            }
359:
360:            public static String asciiToUnicode(String s) {
361:
362:                if ((s == null) || (s.indexOf("\\u") == -1)) {
363:                    return s;
364:                }
365:
366:                int len = s.length();
367:                char[] b = new char[len];
368:                int j = 0;
369:
370:                for (int i = 0; i < len; i++) {
371:                    char c = s.charAt(i);
372:
373:                    if (c == '\\' && i < len - 5) {
374:                        char c1 = s.charAt(i + 1);
375:
376:                        if (c1 == 'u') {
377:                            i++;
378:
379:                            // 4 characters read should always return 0-15
380:                            int k = HEXINDEX.indexOf(s.charAt(++i)) << 12;
381:
382:                            k += HEXINDEX.indexOf(s.charAt(++i)) << 8;
383:                            k += HEXINDEX.indexOf(s.charAt(++i)) << 4;
384:                            k += HEXINDEX.indexOf(s.charAt(++i));
385:                            b[j++] = (char) k;
386:                        } else {
387:                            b[j++] = c;
388:                        }
389:                    } else {
390:                        b[j++] = c;
391:                    }
392:                }
393:
394:                return new String(b, 0, j);
395:            }
396:
397:            public static String readUTF(byte[] bytearr, int offset, int length)
398:                    throws IOException {
399:
400:                char[] buf = new char[length];
401:
402:                return readUTF(bytearr, offset, length, buf);
403:            }
404:
405:            public static String readUTF(byte[] bytearr, int offset,
406:                    int length, char[] buf) throws IOException {
407:
408:                int bcount = 0;
409:                int c, char2, char3;
410:                int count = 0;
411:
412:                while (count < length) {
413:                    c = (int) bytearr[offset + count];
414:
415:                    if (bcount == buf.length) {
416:                        buf = (char[]) ArrayUtil.resizeArray(buf, length);
417:                    }
418:
419:                    if (c > 0) {
420:
421:                        /* 0xxxxxxx*/
422:                        count++;
423:
424:                        buf[bcount++] = (char) c;
425:
426:                        continue;
427:                    }
428:
429:                    c &= 0xff;
430:
431:                    switch (c >> 4) {
432:
433:                    case 12:
434:                    case 13:
435:
436:                        /* 110x xxxx   10xx xxxx*/
437:                        count += 2;
438:
439:                        if (count > length) {
440:                            throw new UTFDataFormatException();
441:                        }
442:
443:                        char2 = (int) bytearr[offset + count - 1];
444:
445:                        if ((char2 & 0xC0) != 0x80) {
446:                            throw new UTFDataFormatException();
447:                        }
448:
449:                        buf[bcount++] = (char) (((c & 0x1F) << 6) | (char2 & 0x3F));
450:                        break;
451:
452:                    case 14:
453:
454:                        /* 1110 xxxx  10xx xxxx  10xx xxxx */
455:                        count += 3;
456:
457:                        if (count > length) {
458:                            throw new UTFDataFormatException();
459:                        }
460:
461:                        char2 = (int) bytearr[offset + count - 2];
462:                        char3 = (int) bytearr[offset + count - 1];
463:
464:                        if (((char2 & 0xC0) != 0x80)
465:                                || ((char3 & 0xC0) != 0x80)) {
466:                            throw new UTFDataFormatException();
467:                        }
468:
469:                        buf[bcount++] = (char) (((c & 0x0F) << 12)
470:                                | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0));
471:                        break;
472:
473:                    default:
474:
475:                        /* 10xx xxxx,  1111 xxxx */
476:                        throw new UTFDataFormatException();
477:                    }
478:                }
479:
480:                // The number of chars produced may be less than length
481:                return new String(buf, 0, bcount);
482:            }
483:
484:            /**
485:             * Writes a string to the specified DataOutput using UTF-8 encoding in a
486:             * machine-independent manner.
487:             * <p>
488:             * @param      str   a string to be written.
489:             * @param      out   destination to write to
490:             * @return     The number of bytes written out.
491:             */
492:            public static int writeUTF(String str, HsqlByteArrayOutputStream out) {
493:
494:                int strlen = str.length();
495:                int c, count = 0;
496:
497:                for (int i = 0; i < strlen; i++) {
498:                    c = str.charAt(i);
499:
500:                    if (c >= 0x0001 && c <= 0x007F) {
501:                        out.write(c);
502:
503:                        count++;
504:                    } else if (c > 0x07FF) {
505:                        out.write(0xE0 | ((c >> 12) & 0x0F));
506:                        out.write(0x80 | ((c >> 6) & 0x3F));
507:                        out.write(0x80 | ((c >> 0) & 0x3F));
508:
509:                        count += 3;
510:                    } else {
511:                        out.write(0xC0 | ((c >> 6) & 0x1F));
512:                        out.write(0x80 | ((c >> 0) & 0x3F));
513:
514:                        count += 2;
515:                    }
516:                }
517:
518:                return count;
519:            }
520:
521:            public static int getUTFSize(String s) {
522:
523:                int len = (s == null) ? 0 : s.length();
524:                int l = 0;
525:
526:                for (int i = 0; i < len; i++) {
527:                    int c = s.charAt(i);
528:
529:                    if ((c >= 0x0001) && (c <= 0x007F)) {
530:                        l++;
531:                    } else if (c > 0x07FF) {
532:                        l += 3;
533:                    } else {
534:                        l += 2;
535:                    }
536:                }
537:
538:                return l;
539:            }
540:
541:            /**
542:             * Using a Reader and a Writer, returns a String from an InputStream.
543:             */
544:            public static String inputStreamToString(InputStream x, int length)
545:                    throws IOException {
546:
547:                InputStreamReader in = new InputStreamReader(x);
548:                StringWriter writer = new StringWriter();
549:                int blocksize = 8 * 1024;
550:                char[] buffer = new char[blocksize];
551:
552:                for (int left = length; left > 0;) {
553:                    int read = in.read(buffer, 0, left > blocksize ? blocksize
554:                            : left);
555:
556:                    if (read == -1) {
557:                        break;
558:                    }
559:
560:                    writer.write(buffer, 0, read);
561:
562:                    left -= read;
563:                }
564:
565:                writer.close();
566:
567:                return writer.toString();
568:            }
569:
570:            // fredt@users 20020130 - patch 497872 by Nitin Chauhan - use byte[] of exact size
571:
572:            /**
573:             * Returns the quoted version of the string using the quotechar argument.
574:             * doublequote argument indicates whether each instance of quotechar
575:             * inside the string is doubled.<p>
576:             *
577:             * null string argument returns null. If the caller needs the literal
578:             * "NULL" it should created it itself <p>
579:             *
580:             * The reverse conversion is handled in Tokenizer.java
581:             */
582:            public static String toQuotedString(String s, char quoteChar,
583:                    boolean extraQuote) {
584:
585:                if (s == null) {
586:                    return null;
587:                }
588:
589:                int count = extraQuote ? count(s, quoteChar) : 0;
590:                int len = s.length();
591:                char[] b = new char[2 + count + len];
592:                int i = 0;
593:                int j = 0;
594:
595:                b[j++] = quoteChar;
596:
597:                for (; i < len; i++) {
598:                    char c = s.charAt(i);
599:
600:                    b[j++] = c;
601:
602:                    if (extraQuote && c == quoteChar) {
603:                        b[j++] = c;
604:                    }
605:                }
606:
607:                b[j] = quoteChar;
608:
609:                return new String(b);
610:            }
611:
612:            /**
613:             * Counts Character c in String s
614:             *
615:             * @param String s
616:             *
617:             * @return int count
618:             */
619:            static int count(final String s, final char c) {
620:
621:                int pos = 0;
622:                int count = 0;
623:
624:                if (s != null) {
625:                    while ((pos = s.indexOf(c, pos)) > -1) {
626:                        count++;
627:                        pos++;
628:                    }
629:                }
630:
631:                return count;
632:            }
633:        }
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