Added an exception to unsupported provider methods instead of no-op'i…

…ng or returning null (#12977)

sdk/storage/azure-storage-blob-nio/src/main/java/com/azure/storage/blob/nio/AzureFileSystemProvider.java

@@ -199,12 +199,13 @@ public Path getPath(URI uri) {
     }
 
     /**
+     * @throws UnsupportedOperationException Operation is not supported.
      * {@inheritDoc}
      */
     @Override
     public SeekableByteChannel newByteChannel(Path path, Set<? extends OpenOption> set,
             FileAttribute<?>... fileAttributes) throws IOException {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     /**
@@ -611,19 +612,21 @@ public void copy(Path source, Path destination, CopyOption... copyOptions) throw
     }*/
 
     /**
+     * @throws UnsupportedOperationException Operation is not supported.
      * {@inheritDoc}
      */
     @Override
     public void move(Path path, Path path1, CopyOption... copyOptions) throws IOException {
-
+        throw new UnsupportedOperationException();
     }
 
     /**
+     * @throws UnsupportedOperationException Operation is not supported.
      * {@inheritDoc}
      */
     @Override
     public boolean isSameFile(Path path, Path path1) throws IOException {
-        return false;
+        throw new UnsupportedOperationException();
     }
 
     /**
@@ -635,19 +638,21 @@ public boolean isHidden(Path path) throws IOException {
     }
 
     /**
+     * @throws UnsupportedOperationException Operation is not supported.
      * {@inheritDoc}
      */
     @Override
     public FileStore getFileStore(Path path) throws IOException {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     /**
+     * @throws UnsupportedOperationException Operation is not supported.
      * {@inheritDoc}
      */
     @Override
     public void checkAccess(Path path, AccessMode... accessModes) throws IOException {
-
+        throw new UnsupportedOperationException();
     }
 
     /**