| /* |
| * 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. 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.jdeprscan.scan; |
| |
| import com.sun.tools.classfile.ClassFile; |
| import com.sun.tools.classfile.ConstantPoolException; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| import java.nio.file.FileSystem; |
| import java.nio.file.FileSystems; |
| import java.nio.file.Files; |
| import java.nio.file.NoSuchFileException; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.stream.Stream; |
| |
| /** |
| * A simple search path for classes. |
| */ |
| public class ClassFinder { |
| final List<PathEntry> list = new ArrayList<>(); |
| final boolean verbose; |
| |
| public ClassFinder(boolean verbose) { |
| this.verbose = verbose; |
| } |
| |
| /** |
| * Adds a directory to this finder's search path, ignoring errors. |
| * |
| * @param dirName the directory to add |
| */ |
| public void addDir(String dirName) { |
| Path dir = Paths.get(dirName); |
| |
| if (Files.isDirectory(dir)) { |
| list.add(new DirPathEntry(dir)); |
| } |
| } |
| |
| /** |
| * Adds a jar file to this finder's search path, ignoring errors. |
| * |
| * @param jarName the jar file name to add |
| */ |
| public void addJar(String jarName) { |
| try { |
| list.add(new JarPathEntry(new JarFile(jarName))); |
| } catch (IOException ignore) { } |
| } |
| |
| /** |
| * Adds the JRT filesystem to this finder's search path. |
| */ |
| public void addJrt() { |
| list.add(new JrtPathEntry()); |
| } |
| |
| /** |
| * Searches the class path for a class with the given name, |
| * returning a ClassFile for it. Returns null if not found. |
| * |
| * @param className the class to search for |
| * @return a ClassFile instance, or null if not found |
| */ |
| public ClassFile find(String className) { |
| for (PathEntry pe : list) { |
| ClassFile cf = pe.find(className); |
| if (cf != null) { |
| return cf; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * An entry in this finder's class path. |
| */ |
| interface PathEntry { |
| /** |
| * Returns a ClassFile instance corresponding to this name, |
| * or null if it's not present in this entry. |
| * |
| * @param className the class to search for |
| * @return a ClassFile instance, or null if not found |
| */ |
| ClassFile find(String className); |
| } |
| |
| /** |
| * An entry that represents a jar file. |
| */ |
| class JarPathEntry implements PathEntry { |
| final JarFile jarFile; |
| |
| JarPathEntry(JarFile jf) { |
| jarFile = jf; |
| } |
| |
| @Override |
| public ClassFile find(String className) { |
| JarEntry entry = jarFile.getJarEntry(className + ".class"); |
| if (entry == null) { |
| return null; |
| } |
| try { |
| return ClassFile.read(jarFile.getInputStream(entry)); |
| } catch (IOException | ConstantPoolException ex) { |
| if (verbose) { |
| ex.printStackTrace(); |
| } |
| } |
| return null; |
| } |
| } |
| |
| /** |
| * An entry that represents a directory containing a class hierarchy. |
| */ |
| class DirPathEntry implements PathEntry { |
| final Path dir; |
| |
| DirPathEntry(Path dir) { |
| this.dir = dir; |
| } |
| |
| @Override |
| public ClassFile find(String className) { |
| Path classFileName = dir.resolve(className + ".class"); |
| try { |
| return ClassFile.read(classFileName); |
| } catch (NoSuchFileException nsfe) { |
| // not found, return silently |
| } catch (IOException | ConstantPoolException ex) { |
| if (verbose) { |
| ex.printStackTrace(); |
| } |
| } |
| return null; |
| } |
| } |
| |
| /** |
| * An entry that represents the JRT filesystem in the running image. |
| * |
| * JRT filesystem structure is: |
| * /packages/<dotted-pkgname>/<modlink> |
| * where modlink is a symbolic link to /modules/<modname> which is |
| * the top of the usual package-class hierarchy |
| */ |
| class JrtPathEntry implements PathEntry { |
| final FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/")); |
| |
| @Override |
| public ClassFile find(String className) { |
| int end = className.lastIndexOf('/'); |
| if (end < 0) { |
| return null; |
| } |
| String pkg = "/packages/" + className.substring(0, end) |
| .replace('/', '.'); |
| try (Stream<Path> mods = Files.list(fs.getPath(pkg))) { |
| Optional<Path> opath = |
| mods.map(path -> path.resolve(className + ".class")) |
| .filter(Files::exists) |
| .findFirst(); |
| if (opath.isPresent()) { |
| return ClassFile.read(opath.get()); |
| } else { |
| return null; |
| } |
| } catch (NoSuchFileException nsfe) { |
| // not found, return silently |
| } catch (IOException | ConstantPoolException ex) { |
| if (verbose) { |
| ex.printStackTrace(); |
| } |
| } |
| return null; |
| } |
| } |
| } |