src/java.base/unix/classes/sun/nio/fs/UnixPath.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2018, Oracle and/or its affiliates. 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.  Oracle designates this

@@ -23,20 +23,35 @@
  * questions.
  */
 
 package sun.nio.fs;
 
-import java.nio.*;
-import java.nio.file.*;
-import java.nio.charset.*;
-import java.io.*;
-import java.net.URI;
-import java.util.*;
+import java.io.IOException;
 import java.lang.ref.SoftReference;
-
-import static sun.nio.fs.UnixNativeDispatcher.*;
-import static sun.nio.fs.UnixConstants.*;
+import java.net.URI;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.CoderResult;
+import java.nio.charset.CodingErrorAction;
+import java.nio.file.InvalidPathException;
+import java.nio.file.LinkOption;
+import java.nio.file.ProviderMismatchException;
+import java.nio.file.Path;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchService;
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.stream.Stream;
+
+import static sun.nio.fs.UnixConstants.EINVAL;
+import static sun.nio.fs.UnixConstants.ELOOP;
+import static sun.nio.fs.UnixConstants.O_NOFOLLOW;
+import static sun.nio.fs.UnixConstants.O_RDONLY;
+import static sun.nio.fs.UnixNativeDispatcher.open;
+import static sun.nio.fs.UnixNativeDispatcher.realpath;
 
 /**
  * Solaris/Linux implementation of java.nio.file.Path
  */
 

@@ -320,10 +335,33 @@
         System.arraycopy(path, 0, result, 0, len);
         return new UnixPath(getFileSystem(), result);
     }
 
     @Override
+    public String getExtension() {
+        final int length = path.length;
+
+        int lastDotIndex = -1;
+        for (int i = length - 1; i >= 0; i--) {
+            byte b = path[i];
+            if (b == '.') {
+                lastDotIndex = i;
+                break;
+            } else if (b == '/') {
+                break;
+            }
+        }
+
+        if (lastDotIndex < 0 || lastDotIndex == length - 1) {
+            return "";
+        }
+
+        int offset = lastDotIndex + 1;
+        return Util.toString(path, offset, length - offset);
+    }
+
+    @Override
     public int getNameCount() {
         initOffsets();
         return offsets.length;
     }