diff -r bb1eb01b8c41 -r 2d8dec41f029 langtools/src/share/classes/com/sun/tools/jdeps/Archive.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/jdeps/Archive.java	Fri Dec 28 22:25:21 2012 -0800
@@ -0,0 +1,173 @@
+/*
+ * 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.Dependency;
+import com.sun.tools.classfile.Dependency.Location;
+import java.io.File;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.SortedSet;
+import java.util.TreeMap;
+import java.util.TreeSet;
+
+/**
+ * Represents the source of the class files.
+ */
+public class Archive {
+    private static Map<String,Archive> archiveForClass = new HashMap<String,Archive>();
+    public static Archive find(Location loc) {
+        return archiveForClass.get(loc.getName());
+    }
+
+    private final File file;
+    private final String filename;
+    private final DependencyRecorder recorder;
+    private final ClassFileReader reader;
+    public Archive(String name) {
+        this.file = null;
+        this.filename = name;
+        this.recorder = new DependencyRecorder();
+        this.reader = null;
+    }
+
+    public Archive(File f, ClassFileReader reader) {
+        this.file = f;
+        this.filename = f.getName();
+        this.recorder = new DependencyRecorder();
+        this.reader = reader;
+    }
+
+    public ClassFileReader reader() {
+        return reader;
+    }
+
+    public String getFileName() {
+        return filename;
+    }
+
+    public void addClass(String classFileName) {
+        Archive a = archiveForClass.get(classFileName);
+        assert(a == null || a == this); // ## issue warning?
+        if (!archiveForClass.containsKey(classFileName)) {
+            archiveForClass.put(classFileName, this);
+        }
+    }
+
+    public void addDependency(Dependency d) {
+        recorder.addDependency(d);
+    }
+
+    /**
+     * Returns a sorted map of a class to its dependencies.
+     */
+    public SortedMap<Location, SortedSet<Location>> getDependencies() {
+        DependencyRecorder.Filter filter = new DependencyRecorder.Filter() {
+            public boolean accept(Location origin, Location target) {
+                 return (archiveForClass.get(origin.getName()) !=
+                            archiveForClass.get(target.getName()));
+        }};
+
+        SortedMap<Location, SortedSet<Location>> result =
+            new TreeMap<Location, SortedSet<Location>>(locationComparator);
+        for (Map.Entry<Location, Set<Location>> e : recorder.dependencies().entrySet()) {
+            Location o = e.getKey();
+            for (Location t : e.getValue()) {
+                if (filter.accept(o, t)) {
+                    SortedSet<Location> odeps = result.get(o);
+                    if (odeps == null) {
+                        odeps = new TreeSet<Location>(locationComparator);
+                        result.put(o, odeps);
+                    }
+                    odeps.add(t);
+                }
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Returns the set of archives this archive requires.
+     */
+    public Set<Archive> getRequiredArchives() {
+        SortedSet<Archive> deps = new TreeSet<Archive>(new Comparator<Archive>() {
+            public int compare(Archive a1, Archive a2) {
+                return a1.toString().compareTo(a2.toString());
+            }
+        });
+
+        for (Map.Entry<Location, Set<Location>> e : recorder.dependencies().entrySet()) {
+            Location o = e.getKey();
+            Archive origin = Archive.find(o);
+            for (Location t : e.getValue()) {
+                Archive target = Archive.find(t);
+                assert(origin != null && target != null);
+                if (origin != target) {
+                    if (!deps.contains(target)) {
+                        deps.add(target);
+                    }
+                }
+            }
+        }
+        return deps;
+    }
+
+    public String toString() {
+        return file != null ? file.getPath() : filename;
+    }
+
+    private static class DependencyRecorder {
+        static interface Filter {
+            boolean accept(Location origin, Location target);
+        }
+
+        public void addDependency(Dependency d) {
+            Set<Location> odeps = map.get(d.getOrigin());
+            if (odeps == null) {
+                odeps = new HashSet<Location>();
+                map.put(d.getOrigin(), odeps);
+            }
+            odeps.add(d.getTarget());
+        }
+
+        public Map<Location, Set<Location>> dependencies() {
+            return map;
+        }
+
+        private final Map<Location, Set<Location>> map =
+            new HashMap<Location, Set<Location>>();
+    }
+
+    private static Comparator<Location> locationComparator =
+        new Comparator<Location>() {
+            public int compare(Location o1, Location o2) {
+                return o1.toString().compareTo(o2.toString());
+            }
+        };
+}