--- /dev/null	2013-02-14 00:07:37.184020992 -0500
+++ new/src/share/classes/java/util/stream/StreamShape.java	2013-02-21 14:11:07.000000000 -0500
@@ -0,0 +1,54 @@
+/*
+ * 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 java.util.stream;
+
+import java.util.function.ToIntFunction;
+
+/**
+ * An enum describing the known shape specializations for stream abstractions.  Each will correspond to
+ * a specific subinterface of {@link BaseStream} (e.g., {@code REFERENCE} corresponds to {@code Stream},
+ * {@code INT_VALUE} corresponds to {@code IntStream}).  Each may also correspond to specializations of
+ * value-handling abstractions such as {@code Spliterator}, {@code Consumer}, etc.
+ *
+ * @apiNote
+ * This enum is used by implementations to determine compatibility between streams and operations (i.e., if the
+ * output shape of a stream is compatible with the input shape of the next operation).  It is also used to reduce
+ * the code bloat associated with having multiple specialized stream types for primitives by allowing some code
+ * to be largely shape-independent.
+ *
+ * <p>Some APIs require you to specify both a generic type and a stream shape for input or output elements, such as
+ * {@link IntermediateOp} which has both generic type parameters for its input and output types, and getters for
+ * the input and output shape.  When representing primitive streams in this way, the generic type parameter should
+ * correspond to the wrapper type for that primitive type.  Accordingly, the {@code IntermediateOp} implementating
+ * {@link Stream#map(ToIntFunction)} would have an output type parameter of {@code Integer} and an output
+ * shape of @{code INT_VALUE}.
+ * @since 1.8
+ */
+enum StreamShape {
+    REFERENCE,
+    INT_VALUE,
+    LONG_VALUE,
+    DOUBLE_VALUE
+}