--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/jdk/internal/jimage/ImageReaderFactory.java	Thu Jun 25 18:24:39 2015 +0200
@@ -0,0 +1,79 @@
+/*
+ * 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.  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.internal.jimage;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.Map;
+
+/**
+ * Factory to get ImageReader
+ */
+public class ImageReaderFactory {
+    private ImageReaderFactory() {}
+
+    private static final String JAVA_HOME = System.getProperty("java.home");
+    private static final Path BOOT_MODULES_JIMAGE =
+        Paths.get(JAVA_HOME, "lib", "modules", "bootmodules.jimage");
+
+    private static final Map<Path, ImageReader> readers = new ConcurrentHashMap<>();
+
+    /**
+     * Returns an {@code ImageReader} to read from the given image file
+     */
+    public static ImageReader get(Path jimage) throws IOException {
+        ImageReader reader = readers.get(jimage);
+        if (reader != null) {
+            return reader;
+        }
+        reader = ImageReader.open(jimage.toString());
+        // potential race with other threads opening the same URL
+        ImageReader r = readers.putIfAbsent(jimage, reader);
+        if (r == null) {
+            return reader;
+        } else {
+            reader.close();
+            return r;
+        }
+    }
+
+    /**
+     * Returns the {@code ImageReader} to read the image file in this
+     * run-time image.
+     *
+     * @throws UncheckedIOException if an I/O error occurs
+     */
+    public static ImageReader getImageReader() {
+        try {
+            return get(BOOT_MODULES_JIMAGE);
+        } catch (IOException ioe) {
+            throw new UncheckedIOException(ioe);
+        }
+    }
+}