Introduce an AspectClass: a representation of a class of aspects.
For native aspects, AspectClass is a facade for Class<AspectFactory<...>>.
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diff --git a/src/main/java/com/google/devtools/build/lib/packages/AspectClass.java b/src/main/java/com/google/devtools/build/lib/packages/AspectClass.java
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+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.packages;
+
+/**
+ * A class of aspects.
+ *
+ * <p>This interface serves as a factory for {@link AspectFactory}.
+ */
+public interface AspectClass {
+
+ /**
+ * Returns an aspect name.
+ */
+ String getName();
+
+ /**
+ * Instantiates an {@link AspectFactory} for this aspect class.
+ */
+ AspectFactory<?, ?, ?> newInstance();
+}
