diff -r 115e09b7a004 -r 3acf8e5e2ca0 jdk/src/share/classes/java/nio/file/attribute/PosixFilePermissions.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jdk/src/share/classes/java/nio/file/attribute/PosixFilePermissions.java Sun Feb 15 12:25:54 2009 +0000 @@ -0,0 +1,180 @@ +/* + * Copyright 2007-2009 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Sun designates this + * particular file as subject to the "Classpath" exception as provided + * by Sun in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + */ + +package java.nio.file.attribute; + +import static java.nio.file.attribute.PosixFilePermission.*; +import java.util.*; + +/** + * This class consists exclusively of static methods that operate on sets of + * {@link PosixFilePermission} objects. + * + * @since 1.7 + */ + +public class PosixFilePermissions { + private PosixFilePermissions() { } + + // Write string representation of permission bits to {@code sb}. + private static void writeBits(StringBuilder sb, boolean r, boolean w, boolean x) { + if (r) { + sb.append('r'); + } else { + sb.append('-'); + } + if (w) { + sb.append('w'); + } else { + sb.append('-'); + } + if (x) { + sb.append('x'); + } else { + sb.append('-'); + } + } + + /** + * Returns the {@code String} representation of a set of permissions. + * + *

If the set contains {@code null} or elements that are not of type + * {@code PosixFilePermission} then these elements are ignored. + * + * @param perms + * The set of permissions + * + * @return The string representation of the permission set + * + * @see #fromString + */ + public static String toString(Set perms) { + StringBuilder sb = new StringBuilder(9); + writeBits(sb, perms.contains(OWNER_READ), perms.contains(OWNER_WRITE), + perms.contains(OWNER_EXECUTE)); + writeBits(sb, perms.contains(GROUP_READ), perms.contains(GROUP_WRITE), + perms.contains(GROUP_EXECUTE)); + writeBits(sb, perms.contains(OTHERS_READ), perms.contains(OTHERS_WRITE), + perms.contains(OTHERS_EXECUTE)); + return sb.toString(); + } + + private static boolean isSet(char c, char setValue) { + if (c == setValue) + return true; + if (c == '-') + return false; + throw new IllegalArgumentException("Invalid mode"); + } + private static boolean isR(char c) { return isSet(c, 'r'); } + private static boolean isW(char c) { return isSet(c, 'w'); } + private static boolean isX(char c) { return isSet(c, 'x'); } + + /** + * Returns the set of permissions corresponding to a given {@code String} + * representation. + * + *

The {@code perms} parameter is a {@code String} representing the + * permissions. It has 9 characters that are interpreted as three sets of + * three. The first set refers to the owner's permissions; the next to the + * group permissions and the last to others. Within each set, the first + * character is {@code 'r'} to indicate permission to read, the second + * character is {@code 'w'} to indicate permission to write, and the third + * character is {@code 'x'} for execute permission. Where a permission is + * not set then the corresponding character is set to {@code '-'}. + * + *

Usage Example: + * Suppose we require the set of permissions that indicate the owner has read, + * write, and execute permissions, the group has read and execute permissions + * and others have none. + * 

+     *   Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rwxr-x---");
+     *
+ * + * @param perms + * String representing a set of permissions + * + * @return The resulting set of permissions + * + * @throws IllegalArgumentException + * If the string cannot be converted to a set of permissions + * + * @see #toString(Set) + */ + public static Set fromString(String perms) { + if (perms.length() != 9) + throw new IllegalArgumentException("Invalid mode"); + Set result = new HashSet(); + if (isR(perms.charAt(0))) result.add(OWNER_READ); + if (isW(perms.charAt(1))) result.add(OWNER_WRITE); + if (isX(perms.charAt(2))) result.add(OWNER_EXECUTE); + if (isR(perms.charAt(3))) result.add(GROUP_READ); + if (isW(perms.charAt(4))) result.add(GROUP_WRITE); + if (isX(perms.charAt(5))) result.add(GROUP_EXECUTE); + if (isR(perms.charAt(6))) result.add(OTHERS_READ); + if (isW(perms.charAt(7))) result.add(OTHERS_WRITE); + if (isX(perms.charAt(8))) result.add(OTHERS_EXECUTE); + return result; + } + + /** + * Creates a {@link FileAttribute}, encapsulating a copy of the given file + * permissions, suitable for passing to the {@link java.nio.file.Path#createFile + * createFile} or {@link java.nio.file.Path#createDirectory createDirectory} + * methods. + * + * @param perms + * The set of permissions + * + * @return An attribute encapsulating the given file permissions with + * {@link FileAttribute#name name} {@code "posix:permissions"} + * + * @throws ClassCastException + * If the sets contains elements that are not of type {@code + * PosixFilePermission} + */ + public static FileAttribute> + asFileAttribute(Set perms) + { + // copy set and check for nulls (CCE will be thrown if an element is not + // a PosixFilePermission) + perms = new HashSet(perms); + for (PosixFilePermission p: perms) { + if (p == null) + throw new NullPointerException(); + } + final Set value = perms; + return new FileAttribute>() { + @Override + public String name() { + return "posix:permissions"; + } + @Override + public Set value() { + return Collections.unmodifiableSet(value); + } + }; + } +}