--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/Main.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2000, 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.javadoc.internal.tool;
+
+import java.io.PrintWriter;
+
+/**
+ * Provides external entry points (tool and programmatic) for the javadoc program.
+ *
+ *  <p><b>This is NOT part of any supported API.
+ *  If you write code that depends on this, you do so at your own risk.
+ *  This code and its internal interfaces are subject to change or
+ *  deletion without notice.</b>
+ */
+
+public class Main {
+
+    /**
+     * Constructor should never be called.
+     */
+    private Main() {}
+
+    /**
+     * The main entry point called by the launcher. This will call
+     * System.exit with an appropriate return value.
+     *
+     * @param args The command line parameters.
+     */
+    public static void main(String... args) {
+        System.exit(execute(args));
+    }
+
+    /**
+     * Programmatic interface.
+     *
+     * @param args The command line parameters.
+     * @return The return code.
+     */
+    public static int execute(String... args) {
+        Start jdoc = new Start();
+        return jdoc.begin(args).exitCode;
+    }
+
+    /**
+     * Programmatic interface.
+     *
+     * @param writer a stream for all output
+     * @param args The command line parameters.
+     * @return The return code.
+     */
+    public static int execute(String[] args, PrintWriter writer) {
+        Start jdoc = new Start(writer, writer);
+        return jdoc.begin(args).exitCode;
+    }
+
+    /**
+     * Programmatic interface.
+     *
+     * @param outWriter a stream for expected output
+     * @param errWriter a stream for diagnostic output
+     * @param args The command line parameters.
+     * @return The return code.
+     */
+    public static int execute(String[] args, PrintWriter outWriter, PrintWriter errWriter) {
+        Start jdoc = new Start(outWriter, errWriter);
+        return jdoc.begin(args).exitCode;
+    }
+
+    public static enum Result {
+        /** completed with no errors */
+        OK(0),
+        /** Completed with reported errors */
+        ERROR(1),
+        /** Bad command-line arguments */
+        CMDERR(2),
+        /** System error or resource exhaustion */
+        SYSERR(3),
+        /** Terminated abnormally */
+        ABNORMAL(4);
+
+        private static final long serialVersionUID = 1L;
+
+        Result(int exitCode) {
+            this.exitCode = exitCode;
+        }
+
+        public boolean isOK() {
+            return (exitCode == 0);
+        }
+
+        public final int exitCode;
+
+        @Override
+        public String toString() {
+            return name() + '(' + exitCode + ')';
+        }
+    }
+}