| /* |
| * 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.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; |
| import java.util.Objects; |
| import java.util.function.Function; |
| |
| /** |
| * Factory to get ImageReader |
| * |
| * @implNote This class needs to maintain JDK 8 source compatibility. |
| * |
| * It is used internally in the JDK to implement jimage/jrtfs access, |
| * but also compiled and delivered as part of the jrtfs.jar to support access |
| * to the jimage file provided by the shipped JDK by tools running on JDK 8. |
| */ |
| 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"); |
| |
| 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 { |
| Objects.requireNonNull(jimage); |
| try { |
| return readers.computeIfAbsent(jimage, OPENER); |
| } catch (UncheckedIOException io) { |
| throw io.getCause(); |
| } |
| } |
| |
| private static Function<Path, ImageReader> OPENER = new Function<Path, ImageReader>() { |
| public ImageReader apply(Path path) { |
| try { |
| return ImageReader.open(path); |
| } catch (IOException io) { |
| throw new UncheckedIOException(io); |
| } |
| } |
| }; |
| |
| /** |
| * 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); |
| } |
| } |
| } |