--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/nio/fs/AbstractUserDefinedFileAttributeView.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2008-2009 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 sun.nio.fs;
+
+import java.nio.ByteBuffer;
+import java.nio.file.attribute.UserDefinedFileAttributeView;
+import java.io.IOException;
+import java.util.*;
+
+/**
+ * Base implementation of NamedAttributeView
+ */
+
+abstract class AbstractUserDefinedFileAttributeView
+    implements UserDefinedFileAttributeView
+{
+    protected AbstractUserDefinedFileAttributeView() { }
+
+    protected void checkAccess(String file,
+                               boolean checkRead,
+                               boolean checkWrite)
+    {
+        assert checkRead || checkWrite;
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            if (checkRead)
+                sm.checkRead(file);
+            if (checkWrite)
+                sm.checkWrite(file);
+            sm.checkPermission(new RuntimePermission("accessUserDefinedAttributes"));
+        }
+    }
+
+    @Override
+    public final String name() {
+        return "xattr";
+    }
+
+    @Override
+    public final Object getAttribute(String attribute) throws IOException {
+        int size;
+        try {
+            size = size(attribute);
+        } catch (IOException e) {
+            // not found or some other I/O error
+            if (list().contains(attribute))
+                throw e;
+            return null;
+        }
+        byte[] buf = new byte[size];
+        int n = read(attribute, ByteBuffer.wrap(buf));
+        return (n == size) ? buf : Arrays.copyOf(buf, n);
+    }
+
+    @Override
+    public final void setAttribute(String attribute, Object value)
+        throws IOException
+    {
+        ByteBuffer bb;
+        if (value instanceof byte[]) {
+            bb = ByteBuffer.wrap((byte[])value);
+        } else {
+            bb = (ByteBuffer)value;
+        }
+        write(attribute, bb);
+    }
+
+    @Override
+    public final Map<String,?> readAttributes(String first, String... rest)
+        throws IOException
+    {
+        // names of attributes to return
+        List<String> names = new ArrayList<String>();
+
+        boolean readAll = false;
+        if (first.equals("*")) {
+            readAll = true;
+        } else {
+            names.add(first);
+        }
+        for (String name: rest) {
+            if (name.equals("*")) {
+                readAll = true;
+            } else {
+                names.add(name);
+            }
+        }
+        if (readAll)
+            names = list();
+
+        // read each value and return in map
+        Map<String,Object> result = new HashMap<String,Object>();
+        for (String name: names) {
+            Object value = getAttribute(name);
+            if (value != null)
+                result.put(name, value);
+        }
+
+        return result;
+    }
+}