Source Code Cross Referenced for Win32FileSystem.java in  » 6.0-JDK-Modules » j2me » java » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)Win32FileSystem.java	1.26 06/10/10
003:         *
004:         * Copyright  1990-2006 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:         */
027:
028:        package java.io;
029:
030:        import java.security.AccessController;
031:        import sun.security.action.GetPropertyAction;
032:
033:        class Win32FileSystem extends FileSystem {
034:
035:            private final char slash;
036:            private final char altSlash;
037:            private final char semicolon;
038:
039:            public Win32FileSystem() {
040:                slash = ((String) AccessController
041:                        .doPrivileged(new GetPropertyAction("file.separator")))
042:                        .charAt(0);
043:                semicolon = ((String) AccessController
044:                        .doPrivileged(new GetPropertyAction("path.separator")))
045:                        .charAt(0);
046:                altSlash = (this .slash == '\\') ? '/' : '\\';
047:            }
048:
049:            private boolean isSlash(char c) {
050:                return (c == '\\') || (c == '/');
051:            }
052:
053:            private boolean isLetter(char c) {
054:                return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
055:            }
056:
057:            private String slashify(String p) {
058:                if ((p.length() > 0) && (p.charAt(0) != slash))
059:                    return slash + p;
060:                else
061:                    return p;
062:            }
063:
064:            /* -- Normalization and construction -- */
065:
066:            public char getSeparator() {
067:                return slash;
068:            }
069:
070:            public char getPathSeparator() {
071:                return semicolon;
072:            }
073:
074:            /* A normal Win32 pathname contains no duplicate slashes, except possibly
075:               for a UNC prefix, and does not end with a slash.  It may be the empty
076:               string.  Normalized Win32 pathnames have the convenient property that
077:               the length of the prefix almost uniquely identifies the type of the path
078:               and whether it is absolute or relative:
079:
080:                   0  relative to both drive and directory
081:               1  drive-relative (begins with '\\')
082:               2  absolute UNC (if first char is '\\'),
083:                    else directory-relative (has form "z:foo")
084:               3  absolute local pathname (begins with "z:\\")
085:             */
086:
087:            private int normalizePrefix(String path, int len, StringBuffer sb) {
088:                int src = 0;
089:                while ((src < len) && isSlash(path.charAt(src)))
090:                    src++;
091:                char c;
092:                if ((len - src >= 2) && isLetter(c = path.charAt(src))
093:                        && path.charAt(src + 1) == ':') {
094:                    /* Remove leading slashes if followed by drive specifier.
095:                       This is necessary to support file URLs containing drive
096:                       specifiers (e.g., "file://c:/path").  As a side effect,
097:                       "/c:/path" can be used as an alternative to "c:/path". */
098:                    sb.append(c);
099:                    sb.append(':');
100:                    src += 2;
101:                } else {
102:                    src = 0;
103:                    if ((len >= 2) && isSlash(path.charAt(0))
104:                            && isSlash(path.charAt(1))) {
105:                        /* UNC pathname: Retain first slash; leave src pointed at
106:                           second slash so that further slashes will be collapsed
107:                           into the second slash.  The result will be a pathname
108:                           beginning with "\\\\" followed (most likely) by a host
109:                           name. */
110:                        src = 1;
111:                        sb.append(slash);
112:                    }
113:                }
114:                return src;
115:            }
116:
117:            /* Normalize the given pathname, whose length is len, starting at the given
118:               offset; everything before this offset is already normal. */
119:            private String normalize(String path, int len, int off) {
120:                if (len == 0)
121:                    return path;
122:                if (off < 3)
123:                    off = 0; /* Avoid fencepost cases with UNC pathnames */
124:                int src;
125:                char slash = this .slash;
126:                StringBuffer sb = new StringBuffer(len);
127:
128:                if (off == 0) {
129:                    /* Complete normalization, including prefix */
130:                    src = normalizePrefix(path, len, sb);
131:                } else {
132:                    /* Partial normalization */
133:                    src = off;
134:                    sb.append(path.substring(0, off));
135:                }
136:
137:                /* Remove redundant slashes from the remainder of the path, forcing all
138:                   slashes into the preferred slash */
139:                while (src < len) {
140:                    char c = path.charAt(src++);
141:                    if (isSlash(c)) {
142:                        while ((src < len) && isSlash(path.charAt(src)))
143:                            src++;
144:                        if (src == len) {
145:                            /* Check for trailing separator */
146:                            int sn = sb.length();
147:                            if ((sn == 2) && (sb.charAt(1) == ':')) {
148:                                /* "z:\\" */
149:                                sb.append(slash);
150:                                break;
151:                            }
152:                            if (sn == 0) {
153:                                /* "\\" */
154:                                sb.append(slash);
155:                                break;
156:                            }
157:                            if ((sn == 1) && (isSlash(sb.charAt(0)))) {
158:                                /* "\\\\" is not collapsed to "\\" because "\\\\" marks
159:                                       the beginning of a UNC pathname.  Even though it is
160:                                       not, by itself, a valid UNC pathname, we leave it as
161:                                       is in order to be consistent with the win32 APIs,
162:                                       which treat this case as an invalid UNC pathname
163:                                       rather than as an alias for the root directory of
164:                                       the current drive. */
165:                                sb.append(slash);
166:                                break;
167:                            }
168:                            /* Path does not denote a root directory, so do not append
169:                               trailing slash */
170:                            break;
171:                        } else {
172:                            sb.append(slash);
173:                        }
174:                    } else {
175:                        sb.append(c);
176:                    }
177:                }
178:
179:                String rv = sb.toString();
180:                return rv;
181:            }
182:
183:            /* Check that the given pathname is normal.  If not, invoke the real
184:               normalizer on the part of the pathname that requires normalization.
185:               This way we iterate through the whole pathname string only once. */
186:            public String normalize(String path) {
187:                int n = path.length();
188:                char slash = this .slash;
189:                char altSlash = this .altSlash;
190:                char prev = 0;
191:                for (int i = 0; i < n; i++) {
192:                    char c = path.charAt(i);
193:                    if (c == altSlash)
194:                        return normalize(path, n, (prev == slash) ? i - 1 : i);
195:                    if ((c == slash) && (prev == slash) && (i > 1))
196:                        return normalize(path, n, i - 1);
197:                    if ((c == ':') && (i > 1))
198:                        return normalize(path, n, 0);
199:                    prev = c;
200:                }
201:                if (prev == slash)
202:                    return normalize(path, n, n - 1);
203:                return path;
204:            }
205:
206:            public int prefixLength(String path) {
207:                char slash = this .slash;
208:                int n = path.length();
209:                if (n == 0)
210:                    return 0;
211:                char c0 = path.charAt(0);
212:                char c1 = (n > 1) ? path.charAt(1) : 0;
213:                if (c0 == slash) {
214:                    if (c1 == slash)
215:                        return 2; /* Absolute UNC pathname "\\\\foo" */
216:                    return 1; /* Drive-relative "\\foo" */
217:                }
218:                if (isLetter(c0) && (c1 == ':')) {
219:                    if ((n > 2) && (path.charAt(2) == slash))
220:                        return 3; /* Absolute local pathname "z:\\foo" */
221:                    return 2; /* Directory-relative "z:foo" */
222:                }
223:                return 0; /* Completely relative */
224:            }
225:
226:            public String resolve(String parent, String child) {
227:                char slash = this .slash;
228:                int pn = parent.length();
229:                if (pn == 0)
230:                    return child;
231:                int cn = child.length();
232:                if (cn == 0)
233:                    return parent;
234:                String c = child;
235:                if ((cn > 1) && (c.charAt(0) == slash)) {
236:                    if (c.charAt(1) == slash) {
237:                        /* Drop prefix when child is a UNC pathname */
238:                        c = c.substring(2);
239:                    } else {
240:                        /* Drop prefix when child is drive-relative */
241:                        c = c.substring(1);
242:                    }
243:                }
244:                String p = parent;
245:                if (p.charAt(pn - 1) == slash)
246:                    p = p.substring(0, pn - 1);
247:                return p + slashify(c);
248:            }
249:
250:            public String getDefaultParent() {
251:                return ("" + slash);
252:            }
253:
254:            public String fromURIPath(String path) {
255:                String p = path;
256:                if ((p.length() > 2) && (p.charAt(2) == ':')) {
257:                    // "/c:/foo" --> "c:/foo"
258:                    p = p.substring(1);
259:                    // "c:/foo/" --> "c:/foo", but "c:/" --> "c:/"
260:                    if ((p.length() > 3) && p.endsWith("/"))
261:                        p = p.substring(0, p.length() - 1);
262:                } else if ((p.length() > 1) && p.endsWith("/")) {
263:                    // "/foo/" --> "/foo"
264:                    p = p.substring(0, p.length() - 1);
265:                }
266:                return p;
267:            }
268:
269:            /* -- Path operations -- */
270:
271:            public boolean isAbsolute(File f) {
272:                int pl = f.getPrefixLength();
273:                return (((pl == 2) && (f.getPath().charAt(0) == slash)) || (pl == 3));
274:            }
275:
276:            protected native String getDriveDirectory(int drive);
277:
278:            private static String[] driveDirCache = new String[26];
279:
280:            private static int driveIndex(char d) {
281:                if ((d >= 'a') && (d <= 'z'))
282:                    return d - 'a';
283:                if ((d >= 'A') && (d <= 'Z'))
284:                    return d - 'A';
285:                return -1;
286:            }
287:
288:            private String getDriveDirectory(char drive) {
289:                int i = driveIndex(drive);
290:                if (i < 0)
291:                    return null;
292:                String s = driveDirCache[i];
293:                if (s != null)
294:                    return s;
295:                s = getDriveDirectory(i + 1);
296:                driveDirCache[i] = s;
297:                return s;
298:            }
299:
300:            private String getUserPath() {
301:                /* For both compatibility and security,
302:                   we must look this up every time */
303:                return normalize(System.getProperty("user.dir"));
304:            }
305:
306:            String getDrive(String path) {
307:                int pl = prefixLength(path);
308:                return (pl == 3) ? path.substring(0, 2) : null;
309:            }
310:
311:            public String resolve(File f) {
312:                String path = f.getPath();
313:                int pl = f.getPrefixLength();
314:                if ((pl == 2) && (path.charAt(0) == slash))
315:                    return path; /* UNC */
316:                if (pl == 3)
317:                    return path; /* Absolute local */
318:                if (pl == 0)
319:                    return getUserPath() + slashify(path); /* Completely relative */
320:                if (pl == 1) { /* Drive-relative */
321:                    String up = getUserPath();
322:                    String ud = getDrive(up);
323:                    if (ud != null)
324:                        return ud + path;
325:                    return up + path; /* User dir is a UNC path */
326:                }
327:                if (pl == 2) { /* Directory-relative */
328:                    String up = getUserPath();
329:                    String ud = getDrive(up);
330:                    if ((ud != null) && path.startsWith(ud))
331:                        return up + slashify(path.substring(2));
332:                    char drive = path.charAt(0);
333:                    String dir = getDriveDirectory(drive);
334:                    String np;
335:                    if (dir != null) {
336:                        /* When resolving a directory-relative path that refers to a
337:                           drive other than the current drive, insist that the caller
338:                           have read permission on the result */
339:                        String p = drive
340:                                + (':' + dir + slashify(path.substring(2)));
341:                        SecurityManager security = System.getSecurityManager();
342:                        try {
343:                            if (security != null)
344:                                security.checkRead(p);
345:                        } catch (SecurityException x) {
346:                            /* Don't disclose the drive's directory in the exception */
347:                            throw new SecurityException("Cannot resolve path "
348:                                    + path);
349:                        }
350:                        return p;
351:                    }
352:                    return drive + ":" + slashify(path.substring(2)); /* fake it */
353:                }
354:                throw new InternalError("Unresolvable path: " + path);
355:            }
356:
357:            // Caches for canonicalization results to improve startup performance.
358:            // The first cache handles repeated canonicalizations of the same path
359:            // name. The prefix cache handles repeated canonicalizations within the
360:            // same directory, and must not create results differing from the true
361:            // canonicalization algorithm in canonicalize_md.c. For this reason the
362:            // prefix cache is conservative and is not used for complex path names.
363:            private ExpiringCache cache = new ExpiringCache();
364:            private ExpiringCache prefixCache = new ExpiringCache();
365:
366:            public String canonicalize(String path) throws IOException {
367:                // *** FIXME - temporary workaround for canonicalize problem FIXME
368:                if (path.startsWith("\\\\")) {
369:                    path = path.substring(1);
370:                }
371:                // ***END FIXME - temporary workaround for canonicalize problem FIXME
372:                if (!useCanonCaches) {
373:                    return canonicalize0(path);
374:                } else {
375:                    String res = cache.get(path);
376:                    if (res == null) {
377:                        String dir = null;
378:                        String resDir = null;
379:                        if (useCanonPrefixCache) {
380:                            dir = parentOrNull(path);
381:                            if (dir != null) {
382:                                resDir = prefixCache.get(dir);
383:                                if (resDir != null) {
384:                                    // Hit only in prefix cache; full path is canonical
385:                                    String filename = path.substring(1 + dir
386:                                            .length());
387:                                    res = resDir + File.separatorChar
388:                                            + filename;
389:                                    cache.put(dir + File.separatorChar
390:                                            + filename, res);
391:                                }
392:                            }
393:                        }
394:                        if (res == null) {
395:                            res = canonicalize0(path);
396:                            cache.put(path, res);
397:                            if (useCanonPrefixCache && dir != null) {
398:                                resDir = parentOrNull(res);
399:                                if (resDir != null) {
400:                                    File f = new File(res);
401:                                    if (f.exists() && !f.isDirectory()) {
402:                                        prefixCache.put(dir, resDir);
403:                                    }
404:                                }
405:                            }
406:                        }
407:                    }
408:                    assert canonicalize0(path).equalsIgnoreCase(res);
409:                    return res;
410:                }
411:            }
412:
413:            protected native String canonicalize0(String path)
414:                    throws IOException;
415:
416:            // Best-effort attempt to get parent of this path; used for
417:            // optimization of filename canonicalization. This must return null for
418:            // any cases where the code in canonicalize_md.c would throw an
419:            // exception or otherwise deal with non-simple pathnames like handling
420:            // of "." and "..". It may conservatively return null in other
421:            // situations as well. Returning null will cause the underlying
422:            // (expensive) canonicalization routine to be called.
423:            static String parentOrNull(String path) {
424:                if (path == null)
425:                    return null;
426:                char sep = File.separatorChar;
427:                char altSep = '/';
428:                int last = path.length() - 1;
429:                int idx = last;
430:                int adjacentDots = 0;
431:                int nonDotCount = 0;
432:                while (idx > 0) {
433:                    char c = path.charAt(idx);
434:                    if (c == '.') {
435:                        if (++adjacentDots >= 2) {
436:                            // Punt on pathnames containing . and ..
437:                            return null;
438:                        }
439:                        if (nonDotCount == 0) {
440:                            // Punt on pathnames ending in a .
441:                            return null;
442:                        }
443:                    } else if (c == sep) {
444:                        if (adjacentDots == 1 && nonDotCount == 0) {
445:                            // Punt on pathnames containing . and ..
446:                            return null;
447:                        }
448:                        if (idx == 0 || idx >= last - 1
449:                                || path.charAt(idx - 1) == sep
450:                                || path.charAt(idx - 1) == altSep) {
451:                            // Punt on pathnames containing adjacent slashes
452:                            // toward the end
453:                            return null;
454:                        }
455:                        return path.substring(0, idx);
456:                    } else if (c == altSep) {
457:                        // Punt on pathnames containing both backward and
458:                        // forward slashes
459:                        return null;
460:                    } else if (c == '*' || c == '?') {
461:                        // Punt on pathnames containing wildcards
462:                        return null;
463:                    } else {
464:                        ++nonDotCount;
465:                        adjacentDots = 0;
466:                    }
467:                    --idx;
468:                }
469:                return null;
470:            }
471:
472:            /* -- Attribute accessors -- */
473:
474:            public native int getBooleanAttributes(File f);
475:
476:            public native boolean checkAccess(File f, boolean write);
477:
478:            public native long getLastModifiedTime(File f);
479:
480:            public native long getLength(File f);
481:
482:            /* -- File operations -- */
483:
484:            public native boolean createFileExclusively(String path)
485:                    throws IOException;
486:
487:            public boolean delete(File f) {
488:                // Keep canonicalization caches in sync after file deletion
489:                // and renaming operations. Could be more clever than this
490:                // (i.e., only remove/update affected entries) but probably
491:                // not worth it since these entries expire after 30 seconds
492:                // anyway.
493:                cache.clear();
494:                prefixCache.clear();
495:                return delete0(f);
496:            }
497:
498:            protected native boolean delete0(File f);
499:
500:            public synchronized native boolean deleteOnExit(File f);
501:
502:            public native String[] list(File f);
503:
504:            public native boolean createDirectory(File f);
505:
506:            public boolean rename(File f1, File f2) {
507:                // Keep canonicalization caches in sync after file deletion
508:                // and renaming operations. Could be more clever than this
509:                // (i.e., only remove/update affected entries) but probably
510:                // not worth it since these entries expire after 30 seconds
511:                // anyway.
512:                cache.clear();
513:                prefixCache.clear();
514:                return rename0(f1, f2);
515:            }
516:
517:            protected native boolean rename0(File f1, File f2);
518:
519:            public native boolean setLastModifiedTime(File f, long time);
520:
521:            public native boolean setReadOnly(File f);
522:
523:            /* -- Filesystem interface -- */
524:
525:            private boolean access(String path) {
526:                try {
527:                    SecurityManager security = System.getSecurityManager();
528:                    if (security != null)
529:                        security.checkRead(path);
530:                    return true;
531:                } catch (SecurityException x) {
532:                    return false;
533:                }
534:            }
535:
536:            private static native int listRoots0();
537:
538:            public File[] listRoots() {
539:                int ds = listRoots0();
540:                int n = 0;
541:                for (int i = 0; i < 26; i++) {
542:                    if (((ds >> i) & 1) != 0) {
543:                        if (!access((char) ('A' + i) + ":" + slash))
544:                            ds &= ~(1 << i);
545:                        else
546:                            n++;
547:                    }
548:                }
549:                File[] fs = new File[n];
550:                int j = 0;
551:                char slash = this .slash;
552:                for (int i = 0; i < 26; i++) {
553:                    if (((ds >> i) & 1) != 0)
554:                        fs[j++] = new File((char) ('A' + i) + ":" + slash);
555:                }
556:                return fs;
557:            }
558:
559:            /* -- Basic infrastructure -- */
560:
561:            public int compare(File f1, File f2) {
562:                return f1.getPath().compareToIgnoreCase(f2.getPath());
563:            }
564:
565:            public int hashCode(File f) {
566:                /* Could make this more efficient: String.hashCodeIgnoreCase */
567:                return f.getPath().toLowerCase().hashCode() ^ 1234321;
568:            }
569:
570:            private static native void initIDs();
571:
572:            static {
573:                initIDs();
574:            }
575:
576:        }
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