--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/lib/testlibrary/ModuleSourceBuilder.java	Mon Dec 19 15:01:14 2016 -0800
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.BufferedWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+
+import static org.testng.Assert.assertTrue;
+
+/**
+ * Utility class for creating test modules.
+ */
+public class ModuleSourceBuilder {
+    private static String MODULE_INFO_JAVA = "module-info.java";
+    private static Pattern MODULE_PATTERN =
+        Pattern.compile("module\\s+((?:\\w+\\.)*)");
+    private static Pattern PACKAGE_PATTERN =
+                       Pattern.compile("package\\s+(((?:\\w+\\.)*)(?:\\w+))");
+    private static Pattern CLASS_PATTERN =
+          Pattern.compile("(?:public\\s+)?(?:class|enum|interface)\\s+(\\w+)");
+
+    private final Path dir;
+    public ModuleSourceBuilder(Path dir) {
+        this.dir = dir;
+    }
+
+    /**
+     * Create java source files of the given module
+     */
+    public void writeJavaFiles(String module, String moduleInfoJava, String... contents)
+        throws IOException
+    {
+        Path msrc = dir.resolve(module);
+        new JavaSource(moduleInfoJava).write(msrc);
+        for (String c : contents) {
+            new JavaSource(c).write(msrc);
+        }
+    }
+
+    /**
+     * Compile the module to the given destination.
+     */
+    public void compile(String module, Path dest, String... options)
+        throws IOException
+    {
+        Path msrc = dir.resolve(module);
+        Stream<String> args =
+            Stream.concat(Arrays.stream(options),
+                          Stream.of("--module-source-path",
+                                    dir.toString()));
+        assertTrue(CompilerUtils.compile(msrc, dest, args.toArray(String[]::new)),
+                   "Fail to compile " + module);
+    }
+
+    static class JavaSource {
+        final String source;
+        JavaSource(String source) {
+            this.source = source;
+        }
+
+        /**
+         * Writes the source code to a file in a specified directory.
+         * @param dir the directory
+         * @throws IOException if there is a problem writing the file
+         */
+        public void write(Path dir) throws IOException {
+            Path file = dir.resolve(getJavaFileNameFromSource(source));
+            Files.createDirectories(file.getParent());
+            try (BufferedWriter out = Files.newBufferedWriter(file)) {
+                out.write(source.replace("\n", System.lineSeparator()));
+            }
+        }
+
+        /**
+         * Extracts the Java file name from the class declaration.
+         * This method is intended for simple files and uses regular expressions,
+         * so comments matching the pattern can make the method fail.
+         */
+        static String getJavaFileNameFromSource(String source) {
+            String packageName = null;
+
+            Matcher matcher = MODULE_PATTERN.matcher(source);
+            if (matcher.find())
+                return MODULE_INFO_JAVA;
+
+            matcher = PACKAGE_PATTERN.matcher(source);
+            if (matcher.find())
+                packageName = matcher.group(1).replace(".", "/");
+
+            matcher = CLASS_PATTERN.matcher(source);
+            if (matcher.find()) {
+                String className = matcher.group(1) + ".java";
+                return (packageName == null) ? className : packageName + "/" + className;
+            } else if (packageName != null) {
+                return packageName + "/package-info.java";
+            } else {
+                throw new Error("Could not extract the java class " +
+                    "name from the provided source");
+            }
+        }
+    }
+}