--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/jdk/jshell/CustomEditor.java	Mon Oct 19 19:15:16 2015 +0200
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Collections;
+
+public class CustomEditor implements AutoCloseable {
+
+    public static final int SOURCE_CODE = 0;
+    public static final int GET_SOURCE_CODE = 1;
+    public static final int REMOVE_CODE = 2;
+
+    public static final int EXIT_CODE = -1;
+    public static final int ACCEPT_CODE = -2;
+    public static final int CANCEL_CODE = -3;
+
+    private final Socket socket;
+    private final Path path;
+    private final StringWriter writer;
+    private final String source;
+
+    public CustomEditor(int port, String fileName) throws IOException {
+        this.socket = new Socket((String) null, port);
+        this.path = Paths.get(fileName);
+        this.writer = new StringWriter();
+        this.source = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
+    }
+
+    public void loop() throws IOException {
+        DataInputStream input = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
+        DataOutputStream output = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
+
+        while (true) {
+            int cmd = input.readInt();
+            switch (cmd) {
+                case EXIT_CODE: {
+                    Files.write(path, Collections.singletonList(writer.toString()));
+                    return;
+                }
+                case GET_SOURCE_CODE: {
+                    byte[] bytes = source.getBytes(StandardCharsets.UTF_8);
+                    output.writeInt(bytes.length);
+                    output.write(bytes);
+                    output.flush();
+                    break;
+                }
+                case REMOVE_CODE: {
+                    // only for external editor
+                    Files.delete(path);
+                    break;
+                }
+                case CANCEL_CODE: {
+                    return;
+                }
+                case ACCEPT_CODE: {
+                    Files.write(path, Collections.singletonList(writer.toString()));
+                    break;
+                }
+                case SOURCE_CODE: {
+                    int length = input.readInt();
+                    byte[] bytes = new byte[length];
+                    input.readFully(bytes);
+                    writer.write(new String(bytes, StandardCharsets.UTF_8));
+                    break;
+                }
+            }
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        if (args.length != 2) {
+            System.err.println("Usage: port file");
+            System.exit(1);
+        }
+        try (CustomEditor editor = new CustomEditor(Integer.parseInt(args[0]), args[1])) {
+            editor.loop();
+        }
+    }
+
+    @Override
+    public void close() throws IOException {
+        socket.close();
+    }
+}