--- /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.
+ *
+ * <p> 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<PosixFilePermission> 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.
+ *
+ * <p> 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 '-'}.
+ *
+ * <p> <b>Usage Example:</b>
+ * 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.
+ * <pre>
+ * Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rwxr-x---");
+ * </pre>
+ *
+ * @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<PosixFilePermission> fromString(String perms) {
+ if (perms.length() != 9)
+ throw new IllegalArgumentException("Invalid mode");
+ Set<PosixFilePermission> result = new HashSet<PosixFilePermission>();
+ 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<Set<PosixFilePermission>>
+ asFileAttribute(Set<PosixFilePermission> perms)
+ {
+ // copy set and check for nulls (CCE will be thrown if an element is not
+ // a PosixFilePermission)
+ perms = new HashSet<PosixFilePermission>(perms);
+ for (PosixFilePermission p: perms) {
+ if (p == null)
+ throw new NullPointerException();
+ }
+ final Set<PosixFilePermission> value = perms;
+ return new FileAttribute<Set<PosixFilePermission>>() {
+ @Override
+ public String name() {
+ return "posix:permissions";
+ }
+ @Override
+ public Set<PosixFilePermission> value() {
+ return Collections.unmodifiableSet(value);
+ }
+ };
+ }
+}