diff -r 115e09b7a004 -r 3acf8e5e2ca0 jdk/src/share/classes/sun/nio/fs/AbstractFileTypeDetector.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/nio/fs/AbstractFileTypeDetector.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,69 @@
+/*
+ * 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.file.FileRef;
+import java.nio.file.spi.FileTypeDetector;
+import java.io.IOException;
+import sun.nio.fs.MimeType;
+
+/**
+ * Base implementation of FileTypeDetector
+ */
+
+public abstract class AbstractFileTypeDetector
+    extends FileTypeDetector
+{
+    protected AbstractFileTypeDetector() {
+        super();
+    }
+
+    /**
+     * Invokes the implProbeContentType method to guess the file's content type,
+     * and this validates that the content type's syntax is valid.
+     */
+    @Override
+    public final String probeContentType(FileRef file) throws IOException {
+        if (file == null)
+            throw new NullPointerException("'file' is null");
+        String result = implProbeContentType(file);
+        if (result != null) {
+            // check the content type
+            try {
+                MimeType.parse(result);
+            } catch (IllegalArgumentException ignore) {
+                result = null;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Probes the given file to guess its content type.
+     */
+    protected abstract String implProbeContentType(FileRef file)
+        throws IOException;
+}