content: /*
   * Copyright (c) 2022, 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
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   * questions.
   */
  
  package javac.internal.jimage;
  
  import com.itsaky.androidide.javac.config.JavacConfigProvider;
  
  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() {}
  
      // AndroidIDE changed: Allow overriding java home.
      private static final String JAVA_HOME = JavacConfigProvider.getJavaHome();
      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);
          }
      }
  }
  