gt:         int lastDot = fileName.lastIndexOf(".");
context: /*
   * Copyright (c) 2009, 2011, 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 com.sun.tools.javac.nio;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.Reader;
  import java.io.Writer;
  import java.net.URI;
  import java.nio.ByteBuffer;
  import java.nio.CharBuffer;
  import java.nio.charset.CharsetDecoder;
  import java.nio.file.Files;
  import java.nio.file.LinkOption;
  import java.nio.file.Path;
  import java.nio.file.attribute.BasicFileAttributes;
  import javax.lang.model.element.Modifier;
  import javax.lang.model.element.NestingKind;
  import javax.tools.JavaFileObject;
  
  
  /**
   *  Implementation of JavaFileObject using java.nio.file API.
   *
   *  <p>PathFileObjects are, for the most part, straightforward wrappers around
   *  Path objects. The primary complexity is the support for "inferBinaryName".
   *  This is left as an abstract method, implemented by each of a number of
   *  different factory methods, which compute the binary name based on
   *  information available at the time the file object is created.
   *
   *  <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>
   */
  abstract class PathFileObject implements JavaFileObject {
      private JavacPathFileManager fileManager;
      private Path path;
  
      /**
       * Create a PathFileObject within a directory, such that the binary name
       * can be inferred from the relationship to the parent directory.
       */
      static PathFileObject createDirectoryPathFileObject(JavacPathFileManager fileManager,
              final Path path, final Path dir) {
          return new PathFileObject(fileManager, path) {
              @Override
              String inferBinaryName(Iterable<? extends Path> paths) {
                  return toBinaryName(dir.relativize(path));
              }
          };
      }
  
      /**
       * Create a PathFileObject in a file system such as a jar file, such that
       * the binary name can be inferred from its position within the filesystem.
       */
      static PathFileObject createJarPathFileObject(JavacPathFileManager fileManager,
              final Path path) {
          return new PathFileObject(fileManager, path) {
              @Override
              String inferBinaryName(Iterable<? extends Path> paths) {
                  return toBinaryName(path);
              }
          };
      }
  
      /**
       * Create a PathFileObject whose binary name can be inferred from the
       * relative path to a sibling.
       */
      static PathFileObject createSiblingPathFileObject(JavacPathFileManager fileManager,
              final Path path, final String relativePath) {
          return new PathFileObject(fileManager, path) {
              @Override
              String inferBinaryName(Iterable<? extends Path> paths) {
                  return toBinaryName(relativePath, "/");
              }
          };
      }
  
      /**
       * Create a PathFileObject whose binary name might be inferred from its
       * position on a search path.
       */
      static PathFileObject createSimplePathFileObject(JavacPathFileManager fileManager,
              final Path path) {
          return new PathFileObject(fileManager, path) {
              @Override
              String inferBinaryName(Iterable<? extends Path> paths) {
                  Path absPath = path.toAbsolutePath();
                  for (Path p: paths) {
                      Path ap = p.toAbsolutePath();
                      if (absPath.startsWith(ap)) {
                          try {
                              Path rp = ap.relativize(absPath);
                              if (rp != null) // maybe null if absPath same as ap
                                  return toBinaryName(rp);
                          } catch (IllegalArgumentException e) {
                              // ignore this p if cannot relativize path to p
                          }
                      }
                  }
                  return null;
              }
          };
      }
  
      protected PathFileObject(JavacPathFileManager fileManager, Path path) {
          fileManager.getClass(); // null check
          path.getClass();        // null check
          this.fileManager = fileManager;
          this.path = path;
      }
  
      abstract String inferBinaryName(Iterable<? extends Path> paths);
  
      /**
       * Return the Path for this object.
       * @return the Path for this object.
       */
      Path getPath() {
          return path;
      }
  
      @Override
      public Kind getKind() {
          return fileManager.getKind(path.getFileName().toString());
      }
  
      @Override
      public boolean isNameCompatible(String simpleName, Kind kind) {
          simpleName.getClass();
          // null check
          if (kind == Kind.OTHER && getKind() != kind) {
              return false;
          }
          String sn = simpleName + kind.extension;
          String pn = path.getFileName().toString();
          if (pn.equals(sn)) {
              return true;
          }
          if (pn.equalsIgnoreCase(sn)) {
              try {
                  // allow for Windows
                  return path.toRealPath(LinkOption.NOFOLLOW_LINKS).getFileName().toString().equals(sn);
              } catch (IOException e) {
              }
          }
          return false;
      }
  
      @Override
      public NestingKind getNestingKind() {
          return null;
      }
  
      @Override
      public Modifier getAccessLevel() {
          return null;
      }
  
      @Override
      public URI toUri() {
          return path.toUri();
      }
  
      @Override
      public String getName() {
          return path.toString();
      }
  
      @Override
      public InputStream openInputStream() throws IOException {
          return Files.newInputStream(path);
      }
  
      @Override
      public OutputStream openOutputStream() throws IOException {
          ensureParentDirectoriesExist();
          return Files.newOutputStream(path);
      }
  
      @Override
      public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
          CharsetDecoder decoder = fileManager.getDecoder(fileManager.getEncodingName(), ignoreEncodingErrors);
          return new InputStreamReader(openInputStream(), decoder);
      }
  
      @Override
      public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
          CharBuffer cb = fileManager.getCachedContent(this);
          if (cb == null) {
              InputStream in = openInputStream();
              try {
                  ByteBuffer bb = fileManager.makeByteBuffer(in);
                  JavaFileObject prev = fileManager.log.useSource(this);
                  try {
                      cb = fileManager.decode(bb, ignoreEncodingErrors);
                  } finally {
                      fileManager.log.useSource(prev);
                  }
                  fileManager.recycleByteBuffer(bb);
                  if (!ignoreEncodingErrors) {
                      fileManager.cache(this, cb);
                  }
              } finally {
                  in.close();
              }
          }
          return cb;
      }
  
      @Override
      public Writer openWriter() throws IOException {
          ensureParentDirectoriesExist();
          return new OutputStreamWriter(Files.newOutputStream(path), fileManager.getEncodingName());
      }
  
      @Override
      public long getLastModified() {
          try {
              return Files.getLastModifiedTime(path).toMillis();
          } catch (IOException e) {
              return -1;
          }
      }
  
      @Override
      public boolean delete() {
          try {
              Files.delete(path);
              return true;
          } catch (IOException e) {
              return false;
          }
      }
  
      public boolean isSameFile(PathFileObject other) {
          try {
              return Files.isSameFile(path, other.path);
          } catch (IOException e) {
              return false;
          }
      }
  
      @Override
      public boolean equals(Object other) {
          return (other instanceof PathFileObject && path.equals(((PathFileObject) other).path));
      }
  
      @Override
      public int hashCode() {
          return path.hashCode();
      }
  
      @Override
      public String toString() {
          return getClass().getSimpleName() + "[" + path + "]";
      }
  
      private void ensureParentDirectoriesExist() throws IOException {
          Path parent = path.getParent();
          if (parent != null)
              Files.createDirectories(parent);
      }
  
      private long size() {
          try {
              return Files.size(path);
          } catch (IOException e) {
              return -1;
          }
      }
  
      protected static String toBinaryName(Path relativePath) {
          return toBinaryName(relativePath.toString(),
                  relativePath.getFileSystem().getSeparator());
      }
  
      protected static String toBinaryName(String relativePath, String sep) {
          return removeExtension(relativePath).replace(sep, ".");
      }
  
      protected static String removeExtension(String fileName) {
  