author | redestad |
Thu, 21 Apr 2016 13:39:53 +0200 | |
changeset 37593 | 824750ada3d6 |
parent 31471 | ae27c6f1d8bf |
child 37781 | 71ed5645f17c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.io; |
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import java.util.Properties; |
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import sun.security.action.GetPropertyAction; |
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class UnixFileSystem extends FileSystem { |
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private final char slash; |
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private final char colon; |
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private final String javaHome; |
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public UnixFileSystem() { |
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Properties props = GetPropertyAction.getProperties(); |
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slash = props.getProperty("file.separator").charAt(0); |
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colon = props.getProperty("path.separator").charAt(0); |
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javaHome = props.getProperty("java.home"); |
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} |
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/* -- Normalization and construction -- */ |
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public char getSeparator() { |
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return slash; |
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} |
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public char getPathSeparator() { |
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return colon; |
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} |
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/* A normal Unix pathname contains no duplicate slashes and does not end |
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with a slash. It may be the empty string. */ |
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/* Normalize the given pathname, whose length is len, starting at the given |
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offset; everything before this offset is already normal. */ |
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private String normalize(String pathname, int len, int off) { |
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if (len == 0) return pathname; |
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int n = len; |
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while ((n > 0) && (pathname.charAt(n - 1) == '/')) n--; |
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if (n == 0) return "/"; |
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StringBuilder sb = new StringBuilder(pathname.length()); |
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if (off > 0) sb.append(pathname, 0, off); |
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char prevChar = 0; |
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for (int i = off; i < n; i++) { |
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char c = pathname.charAt(i); |
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if ((prevChar == '/') && (c == '/')) continue; |
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sb.append(c); |
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prevChar = c; |
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} |
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return sb.toString(); |
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} |
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/* Check that the given pathname is normal. If not, invoke the real |
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normalizer on the part of the pathname that requires normalization. |
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This way we iterate through the whole pathname string only once. */ |
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public String normalize(String pathname) { |
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int n = pathname.length(); |
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char prevChar = 0; |
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for (int i = 0; i < n; i++) { |
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char c = pathname.charAt(i); |
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if ((prevChar == '/') && (c == '/')) |
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return normalize(pathname, n, i - 1); |
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prevChar = c; |
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} |
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if (prevChar == '/') return normalize(pathname, n, n - 1); |
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return pathname; |
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} |
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public int prefixLength(String pathname) { |
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if (pathname.length() == 0) return 0; |
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return (pathname.charAt(0) == '/') ? 1 : 0; |
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} |
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public String resolve(String parent, String child) { |
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if (child.equals("")) return parent; |
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if (child.charAt(0) == '/') { |
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if (parent.equals("/")) return child; |
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return parent + child; |
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} |
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if (parent.equals("/")) return parent + child; |
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return parent + '/' + child; |
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} |
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public String getDefaultParent() { |
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return "/"; |
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} |
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public String fromURIPath(String path) { |
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String p = path; |
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if (p.endsWith("/") && (p.length() > 1)) { |
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// "/foo/" --> "/foo", but "/" --> "/" |
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p = p.substring(0, p.length() - 1); |
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} |
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return p; |
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} |
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/* -- Path operations -- */ |
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public boolean isAbsolute(File f) { |
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return (f.getPrefixLength() != 0); |
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} |
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public String resolve(File f) { |
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if (isAbsolute(f)) return f.getPath(); |
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return resolve(System.getProperty("user.dir"), f.getPath()); |
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} |
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// Caches for canonicalization results to improve startup performance. |
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// The first cache handles repeated canonicalizations of the same path |
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// name. The prefix cache handles repeated canonicalizations within the |
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// same directory, and must not create results differing from the true |
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// canonicalization algorithm in canonicalize_md.c. For this reason the |
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// prefix cache is conservative and is not used for complex path names. |
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private ExpiringCache cache = new ExpiringCache(); |
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// On Unix symlinks can jump anywhere in the file system, so we only |
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// treat prefixes in java.home as trusted and cacheable in the |
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// canonicalization algorithm |
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private ExpiringCache javaHomePrefixCache = new ExpiringCache(); |
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public String canonicalize(String path) throws IOException { |
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if (!useCanonCaches) { |
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return canonicalize0(path); |
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} else { |
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String res = cache.get(path); |
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if (res == null) { |
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String dir = null; |
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String resDir = null; |
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if (useCanonPrefixCache) { |
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// Note that this can cause symlinks that should |
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// be resolved to a destination directory to be |
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// resolved to the directory they're contained in |
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dir = parentOrNull(path); |
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if (dir != null) { |
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resDir = javaHomePrefixCache.get(dir); |
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if (resDir != null) { |
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// Hit only in prefix cache; full path is canonical |
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String filename = path.substring(1 + dir.length()); |
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res = resDir + slash + filename; |
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cache.put(dir + slash + filename, res); |
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} |
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} |
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} |
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if (res == null) { |
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res = canonicalize0(path); |
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cache.put(path, res); |
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if (useCanonPrefixCache && |
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dir != null && dir.startsWith(javaHome)) { |
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resDir = parentOrNull(res); |
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// Note that we don't allow a resolved symlink |
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// to elsewhere in java.home to pollute the |
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// prefix cache (java.home prefix cache could |
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// just as easily be a set at this point) |
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if (resDir != null && resDir.equals(dir)) { |
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File f = new File(res); |
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if (f.exists() && !f.isDirectory()) { |
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javaHomePrefixCache.put(dir, resDir); |
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} |
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} |
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} |
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} |
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} |
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return res; |
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} |
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} |
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private native String canonicalize0(String path) throws IOException; |
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// Best-effort attempt to get parent of this path; used for |
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// optimization of filename canonicalization. This must return null for |
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// any cases where the code in canonicalize_md.c would throw an |
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// exception or otherwise deal with non-simple pathnames like handling |
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// of "." and "..". It may conservatively return null in other |
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// situations as well. Returning null will cause the underlying |
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// (expensive) canonicalization routine to be called. |
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static String parentOrNull(String path) { |
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if (path == null) return null; |
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char sep = File.separatorChar; |
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int last = path.length() - 1; |
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int idx = last; |
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int adjacentDots = 0; |
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int nonDotCount = 0; |
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while (idx > 0) { |
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char c = path.charAt(idx); |
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if (c == '.') { |
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if (++adjacentDots >= 2) { |
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// Punt on pathnames containing . and .. |
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return null; |
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} |
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} else if (c == sep) { |
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if (adjacentDots == 1 && nonDotCount == 0) { |
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// Punt on pathnames containing . and .. |
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return null; |
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} |
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if (idx == 0 || |
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idx >= last - 1 || |
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path.charAt(idx - 1) == sep) { |
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// Punt on pathnames containing adjacent slashes |
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// toward the end |
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return null; |
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} |
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return path.substring(0, idx); |
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} else { |
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++nonDotCount; |
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adjacentDots = 0; |
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} |
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--idx; |
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} |
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return null; |
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} |
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/* -- Attribute accessors -- */ |
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public native int getBooleanAttributes0(File f); |
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public int getBooleanAttributes(File f) { |
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int rv = getBooleanAttributes0(f); |
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String name = f.getName(); |
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boolean hidden = (name.length() > 0) && (name.charAt(0) == '.'); |
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return rv | (hidden ? BA_HIDDEN : 0); |
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} |
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public native boolean checkAccess(File f, int access); |
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public native long getLastModifiedTime(File f); |
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public native long getLength(File f); |
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public native boolean setPermission(File f, int access, boolean enable, boolean owneronly); |
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/* -- File operations -- */ |
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public native boolean createFileExclusively(String path) |
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throws IOException; |
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public boolean delete(File f) { |
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// Keep canonicalization caches in sync after file deletion |
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// and renaming operations. Could be more clever than this |
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// (i.e., only remove/update affected entries) but probably |
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// not worth it since these entries expire after 30 seconds |
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// anyway. |
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cache.clear(); |
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javaHomePrefixCache.clear(); |
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return delete0(f); |
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} |
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private native boolean delete0(File f); |
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public native String[] list(File f); |
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public native boolean createDirectory(File f); |
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public boolean rename(File f1, File f2) { |
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// Keep canonicalization caches in sync after file deletion |
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// and renaming operations. Could be more clever than this |
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// (i.e., only remove/update affected entries) but probably |
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// not worth it since these entries expire after 30 seconds |
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// anyway. |
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cache.clear(); |
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javaHomePrefixCache.clear(); |
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return rename0(f1, f2); |
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} |
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private native boolean rename0(File f1, File f2); |
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public native boolean setLastModifiedTime(File f, long time); |
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public native boolean setReadOnly(File f); |
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/* -- Filesystem interface -- */ |
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public File[] listRoots() { |
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try { |
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SecurityManager security = System.getSecurityManager(); |
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if (security != null) { |
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security.checkRead("/"); |
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} |
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return new File[] { new File("/") }; |
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} catch (SecurityException x) { |
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return new File[0]; |
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} |
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} |
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/* -- Disk usage -- */ |
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public native long getSpace(File f, int t); |
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/* -- Basic infrastructure -- */ |
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public int compare(File f1, File f2) { |
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return f1.getPath().compareTo(f2.getPath()); |
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} |
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public int hashCode(File f) { |
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return f.getPath().hashCode() ^ 1234321; |
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} |
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private static native void initIDs(); |
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static { |
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initIDs(); |
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} |
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} |