--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.editpad/share/classes/jdk/editpad/EditPad.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2015, 2016, 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
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.editpad;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.Font;
+import java.awt.event.ActionListener;
+import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
+import java.util.function.Consumer;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+
+/**
+ * A minimal Swing editor as a fallback when the user does not specify an
+ * external editor.
+ */
+class EditPad implements Runnable {
+
+    private static final String L10N_RB_NAME  = "jdk.editpad.resources.l10n";
+    private ResourceBundle rb  = null;
+    private final String windowLabel;
+    private final Consumer<String> errorHandler;
+    private final String initialText;
+    private final Runnable closeMark;
+    private final Consumer<String> saveHandler;
+
+    /**
+     * Create an Edit Pad minimal editor.
+     *
+     * @param windowLabel the label string for the Edit Pad window
+     * @param errorHandler a handler for unexpected errors
+     * @param initialText the source to load in the Edit Pad
+     * @param closeMark a Runnable that is run when Edit Pad closes
+     * @param saveHandler a handler for changed source (sent the full source)
+     */
+    EditPad(String windowLabel, Consumer<String> errorHandler, String initialText,
+            Runnable closeMark, Consumer<String> saveHandler) {
+        this.windowLabel = windowLabel;
+        this.errorHandler = errorHandler;
+        this.initialText = initialText;
+        this.closeMark = closeMark;
+        this.saveHandler = saveHandler;
+    }
+
+    @Override
+    public void run() {
+        JFrame jframe = new JFrame(windowLabel == null
+                ? getResourceString("editpad.name")
+                : windowLabel);
+        Runnable closer = () -> {
+            jframe.setVisible(false);
+            jframe.dispose();
+            closeMark.run();
+        };
+        jframe.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                closer.run();
+            }
+        });
+        jframe.setLocationRelativeTo(null);
+        jframe.setLayout(new BorderLayout());
+        JTextArea textArea = new JTextArea(initialText);
+        textArea.setFont(new Font("monospaced", Font.PLAIN, 13));
+        jframe.add(new JScrollPane(textArea), BorderLayout.CENTER);
+        jframe.add(buttons(closer, textArea), BorderLayout.SOUTH);
+
+        jframe.setSize(800, 600);
+        jframe.setVisible(true);
+    }
+
+    private JPanel buttons(Runnable closer, JTextArea textArea) {
+        FlowLayout flow = new FlowLayout();
+        flow.setHgap(35);
+        JPanel buttons = new JPanel(flow);
+        addButton(buttons, "editpad.cancel", KeyEvent.VK_C, e -> {
+            closer.run();
+        });
+        addButton(buttons, "editpad.accept", KeyEvent.VK_A, e -> {
+            saveHandler.accept(textArea.getText());
+        });
+        addButton(buttons, "editpad.exit",   KeyEvent.VK_X, e -> {
+            saveHandler.accept(textArea.getText());
+            closer.run();
+        });
+        return buttons;
+    }
+
+    private void addButton(JPanel buttons, String rkey, int mnemonic, ActionListener action) {
+        JButton but = new JButton(getResourceString(rkey));
+        but.setMnemonic(mnemonic);
+        buttons.add(but);
+        but.addActionListener(action);
+    }
+
+    private String getResourceString(String key) {
+        if (rb == null) {
+            try {
+                rb = ResourceBundle.getBundle(L10N_RB_NAME);
+            } catch (MissingResourceException mre) {
+                error("Cannot find ResourceBundle: %s", L10N_RB_NAME);
+                return "";
+            }
+        }
+        String s;
+        try {
+            s = rb.getString(key);
+        } catch (MissingResourceException mre) {
+            error("Missing resource: %s in %s", key, L10N_RB_NAME);
+            return "";
+        }
+        return s;
+    }
+
+    private void error(String fmt, Object... args) {
+        errorHandler.accept(String.format(fmt, args));
+    }
+}