--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/nio/file/attribute/UserPrincipalLookupService.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,104 @@
+/*
+ * 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 java.io.IOException;
+
+/**
+ * An object to lookup user and group principals by name. A {@link UserPrincipal}
+ * represents an identity that may be used to determine access rights to objects
+ * in a file system. A {@link GroupPrincipal} represents a <em>group identity</em>.
+ * A {@code UserPrincipalLookupService} defines methods to lookup identities by
+ * name or group name (which are typically user or account names). Whether names
+ * and group names are case sensitive or not depends on the implementation.
+ * The exact definition of a group is implementation specific but typically a
+ * group represents an identity created for administrative purposes so as to
+ * determine the access rights for the members of the group. In particular it is
+ * implementation specific if the <em>namespace</em> for names and groups is the
+ * same or is distinct. To ensure consistent and correct behavior across
+ * platforms it is recommended that this API be used as if the namespaces are
+ * distinct. In other words, the {@link #lookupPrincipalByName
+ * lookupPrincipalByName} should be used to lookup users, and {@link
+ * #lookupPrincipalByGroupName lookupPrincipalByGroupName} should be used to
+ * lookup groups.
+ *
+ * @since 1.7
+ *
+ * @see java.nio.file.FileSystem#getUserPrincipalLookupService
+ */
+
+public abstract class UserPrincipalLookupService {
+
+    /**
+     * Initializes a new instance of this class.
+     */
+    protected UserPrincipalLookupService() {
+    }
+
+    /**
+     * Lookup a user principal by name.
+     *
+     * @param   name
+     *          The string representation of the user principal to lookup
+     *
+     * @return  A user principal
+     *
+     * @throws  UserPrincipalNotFoundException
+     *          The principal does not exist
+     * @throws  IOException
+     *          If an I/O error occurs
+     * @throws  SecurityException
+     *          In the case of the default provider, and a security manager is
+     *          installed, it checks {@link RuntimePermission}<tt>("lookupUserInformation")</tt>
+     */
+    public abstract UserPrincipal lookupPrincipalByName(String name)
+        throws IOException;
+
+    /**
+     * Lookup a group principal by group name.
+     *
+     * <p> Where an implementation does not support any notion of group then
+     * this method always throws {@link UserPrincipalNotFoundException}. Where
+     * the namespace for user accounts and groups is the same, then this method
+     * is identical to invoking {@link #lookupPrincipalByName
+     * lookupPrincipalByName}.
+     *
+     * @param   group
+     *          The string representation of the group to lookup
+     *
+     * @return  A user principal.
+     *
+     * @throws  UserPrincipalNotFoundException
+     *          The principal does not exist or is not a group
+     * @throws  IOException
+     *          If an I/O error occurs
+     * @throws  SecurityException
+     *          In the case of the default provider, and a security manager is
+     *          installed, it checks {@link RuntimePermission}<tt>("lookupUserInformation")</tt>
+     */
+    public abstract GroupPrincipal lookupPrincipalByGroupName(String group)
+        throws IOException;
+}