diff -r 475eb15dfdad -r f91144b7da75 src/share/classes/com/sun/tools/sjavac/CompileChunk.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/sjavac/CompileChunk.java	Mon Feb 04 18:08:53 2013 -0500
@@ -0,0 +1,57 @@
+/*
+ * 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.net.URI;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A compile chunk is a list of sources/packages to be compiled. Possibly a subset of
+ * the total number of sources/packages to be compiled for this sjavac invocation.
+ *
+ * <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 CompileChunk implements Comparable<CompileChunk> {
+    public int numPackages;
+    public int numDependents;
+    public Set<URI> srcs = new HashSet<URI>();
+    public StringBuilder pkgNames = new StringBuilder();
+    public String pkgFromTos = "";
+
+    public int compareTo(CompileChunk c) {
+        if (numDependents == c.numDependents) return 0;
+        if (numDependents > c.numDependents) return -1;
+        return -1;
+    }
+
+    boolean equal(CompileChunk c) {
+        return numDependents == c.numDependents;
+    }
+}