--- /dev/null	2012-10-24 11:46:27.564410214 +0200
+++ new/langtools/src/share/classes/com/sun/tools/jdeps/ClassFileReader.java	2012-12-06 15:26:12.057771440 +0100
@@ -0,0 +1,275 @@
+/*
+ * Copyright (c) 2012, 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.jdeps;
+
+import com.sun.tools.classfile.ClassFile;
+import com.sun.tools.classfile.ConstantPoolException;
+import com.sun.tools.classfile.Dependencies.ClassFileError;
+import java.io.*;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.*;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+/**
+ * ClassFileReader reads ClassFile(s) of a given path that can be
+ * a .class file, a directory, or a JAR file.
+ */
+public class ClassFileReader {
+    /**
+     * Returns a ClassFileReader instance of a given path.
+     */
+    public static ClassFileReader newInstance(File path) throws IOException {
+        if (!path.exists()) {
+            throw new FileNotFoundException(path.getAbsolutePath());
+        }
+
+        if (path.isDirectory()) {
+            return new DirectoryReader(path.toPath());
+        } else if (path.getName().endsWith(".jar")) {
+            return new JarFileReader(path.toPath());
+        } else {
+            return new ClassFileReader(path.toPath());
+        }
+    }
+
+    protected final Path path;
+    protected final String baseFileName;
+    private ClassFileReader(Path path) {
+        this.path = path;
+        this.baseFileName = path.getFileName().toString();
+    }
+
+    public String getFileName() {
+        return path.getFileName().toString();
+    }
+
+    public ClassFile getClassFile(String classname) {
+        String fn = classname.replace('.', File.separatorChar) + ".class";
+        if (!fn.equals(baseFileName)) {
+            return null;
+        }
+
+        try (InputStream is = Files.newInputStream(path)) {
+            return ClassFile.read(is);
+        } catch (IOException | ConstantPoolException e) {
+            throw new ClassFileError(e);
+        }
+    }
+
+    public Iterable<ClassFile> getClassFiles() throws IOException {
+        return new Iterable<ClassFile>() {
+            public Iterator<ClassFile> iterator() {
+                return new FileIterator();
+            }
+        };
+    }
+
+    class FileIterator implements Iterator<ClassFile> {
+        int count;
+        FileIterator() {
+            this.count = 0;
+        }
+        public boolean hasNext() {
+            return count == 0 && baseFileName.endsWith(".class");
+        }
+
+        public ClassFile next() {
+            if (!hasNext()) {
+                throw new NoSuchElementException();
+            }
+
+            try (InputStream is = Files.newInputStream(path)) {
+                count++;
+                return ClassFile.read(is);
+            } catch (IOException | ConstantPoolException e) {
+                throw new ClassFileError(e);
+            }
+        }
+
+        public void remove() {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+    }
+
+    public String toString() {
+        return path.toString();
+    }
+
+    private static class DirectoryReader extends ClassFileReader {
+        DirectoryReader(Path path) throws IOException {
+            super(path);
+        }
+
+        @Override
+        public ClassFile getClassFile(String classname) {
+            String fn = classname.replace('.', '/') + ".class";
+            Path p = path.resolve(fn);
+            if (!p.toFile().exists()) {
+                return null;
+            }
+            try (InputStream is = Files.newInputStream(p)) {
+                return ClassFile.read(is);
+            } catch (IOException | ConstantPoolException e) {
+                throw new ClassFileError(e);
+            }
+        }
+
+        public Iterable<ClassFile> getClassFiles() throws IOException {
+            final Iterator<ClassFile> iter = new DirectoryIterator();
+            return new Iterable<ClassFile>() {
+                public Iterator<ClassFile> iterator() {
+                    return iter;
+                }
+            };
+        }
+
+        private List<Path> walkTree(Path dir) throws IOException {
+            final List<Path> files = new ArrayList<>();
+            Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
+                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
+                        throws IOException {
+                    if (file.toFile().getName().endsWith(".class")) {
+                        files.add(file);
+                    }
+                    return FileVisitResult.CONTINUE;
+                }
+            });
+            return files;
+        }
+
+        class DirectoryIterator implements Iterator<ClassFile> {
+            private List<Path> entries;
+            private int index = 0;
+            DirectoryIterator() throws IOException {
+                entries = walkTree(path);
+                index = 0;
+            }
+
+            public boolean hasNext() {
+                return index != entries.size();
+            }
+
+            public ClassFile next() {
+                if (!hasNext()) {
+                    throw new NoSuchElementException();
+                }
+                Path path = entries.get(index++);
+                try (InputStream is = Files.newInputStream(path)) {
+                    return ClassFile.read(is);
+                } catch (IOException | ConstantPoolException e) {
+                    throw new ClassFileError(e);
+                }
+            }
+
+            public void remove() {
+                throw new UnsupportedOperationException("Not supported yet.");
+            }
+        }
+    }
+
+    private static class JarFileReader extends ClassFileReader {
+        final JarFile jarfile;
+        JarFileReader(Path path) throws IOException {
+            super(path);
+            this.jarfile = new JarFile(path.toFile());
+        }
+
+        public ClassFile getClassFile(String classname) {
+            String fn = classname.replace('.', '/') + ".class";
+            JarEntry e = jarfile.getJarEntry(fn);
+            if (e == null) {
+                return null;
+            }
+
+            try (InputStream is = jarfile.getInputStream(e)) {
+                return ClassFile.read(is);
+            } catch (IOException | ConstantPoolException ex) {
+                throw new ClassFileError(ex);
+            }
+        }
+
+        public Iterable<ClassFile> getClassFiles() throws IOException {
+            final Iterator<ClassFile> iter = new JarFileIterator();
+            return new Iterable<ClassFile>() {
+                public Iterator<ClassFile> iterator() {
+                    return iter;
+                }
+            };
+        }
+
+        class JarFileIterator implements Iterator<ClassFile> {
+            private Enumeration<JarEntry> entries;
+            private JarEntry nextEntry;
+            JarFileIterator() {
+                this.entries = jarfile.entries();
+                while (entries.hasMoreElements()) {
+                    JarEntry e = entries.nextElement();
+                    String name = e.getName();
+                    if (name.endsWith(".class")) {
+                        this.nextEntry = e;
+                        break;
+                    }
+                }
+            }
+
+            public boolean hasNext() {
+                return nextEntry != null;
+            }
+
+            public ClassFile next() {
+                if (!hasNext()) {
+                    throw new NoSuchElementException();
+                }
+
+                ClassFile cf;
+                try {
+                    cf = ClassFile.read(jarfile.getInputStream(nextEntry));
+                } catch (IOException | ConstantPoolException ex) {
+                    throw new ClassFileError(ex);
+                }
+                JarEntry entry = nextEntry;
+                nextEntry = null;
+                while (entries.hasMoreElements()) {
+                    JarEntry e = entries.nextElement();
+                    String name = e.getName();
+                    if (name.endsWith(".class")) {
+                        nextEntry = e;
+                        break;
+                    }
+                }
+                return cf;
+            }
+
+            public void remove() {
+                throw new UnsupportedOperationException("Not supported yet.");
+            }
+        }
+    }
+}