diff -r 475eb15dfdad -r f91144b7da75 src/share/classes/com/sun/tools/sjavac/Module.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/sjavac/Module.java	Mon Feb 04 18:08:53 2013 -0500
@@ -0,0 +1,141 @@
+/*
+ * 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.sjavac;
+
+import java.io.File;
+import java.net.URI;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * The module is the root of a set of packages/sources/artifacts.
+ * At the moment there is only one module in use, the empty/no-name/default module.
+ *
+ * <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></p>
+ */
+public class Module implements Comparable<Module> {
+    private String name;
+    private String dirname;
+    private Map<String,Package> packages = new HashMap<String,Package>();
+    private Map<String,Source> sources = new HashMap<String,Source>();
+    private Map<String,File> artifacts = new HashMap<String,File>();
+
+    public Module(String n, String dn) {
+        name = n;
+        dirname = n;
+    }
+
+    public String name() { return name; }
+    public String dirname() { return dirname; }
+    public Map<String,Package> packages() { return packages; }
+    public Map<String,Source> sources() { return sources; }
+    public Map<String,File> artifacts() { return artifacts; }
+
+    @Override
+    public boolean equals(Object o) {
+        return (o instanceof Module) && name.equals(((Module)o).name);
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
+    @Override
+    public int compareTo(Module o) {
+        return name.compareTo(o.name);
+    }
+
+    public void save(StringBuilder b) {
+        b.append("M ").append(name).append(":").append("\n");
+        Package.savePackages(packages, b);
+    }
+
+    public static Module load(String l) {
+        int cp = l.indexOf(':',2);
+        if (cp == -1) return null;
+        String name = l.substring(2,cp);
+        return new Module(name, "");
+    }
+
+    public static void saveModules(Map<String,Module> ms, StringBuilder b)
+    {
+        for (Module m : ms.values()) {
+            m.save(b);
+        }
+    }
+
+    public void addPackage(Package p) {
+        packages.put(p.name(), p);
+    }
+
+    public Package lookupPackage(String pkg) {
+        Package p = packages.get(pkg);
+        if (p == null) {
+            p = new Package(this, pkg);
+            packages.put(pkg, p);
+        }
+        return p;
+    }
+
+    public void addSource(String pkg, Source src) {
+        Package p = lookupPackage(pkg);
+        src.setPackage(p);
+        p.addSource(src);
+        sources.put(src.file().getPath(), src);
+    }
+
+    public Source lookupSource(String path) {
+        return sources.get(path);
+    }
+
+    public void addArtifacts(String pkg, Set<URI> as) {
+        Package p = lookupPackage(pkg);
+        for (URI u : as) {
+            p.addArtifact(new File(u));
+        }
+    }
+
+    public void setDependencies(String pkg, Set<String> deps) {
+        Package p = lookupPackage(pkg);
+        p.setDependencies(deps);
+    }
+
+    public void setPubapi(String pkg, List<String> ps) {
+        Package p = lookupPackage(pkg);
+        p.setPubapi(ps);
+    }
+
+    public boolean hasPubapiChanged(String pkg, List<String> ps) {
+        Package p = lookupPackage(pkg);
+        return p.hasPubapiChanged(ps);
+    }
+}