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diff --git a/mobile_install/adapters/base.bzl b/mobile_install/adapters/base.bzl
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+# Copyright 2018 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.
+"""Provides the base adapter functions."""
+
+def make_adapter(aspect_attrs, adapt):
+    """Creates an Adapter.
+
+    Args:
+      aspect_attrs: A function that returns a list of attrs for the aspect.
+      adapt: A function that extracts and processes data from the target.
+
+    Returns:
+      A struct that represents an adapter.
+    """
+    if not aspect_attrs:
+        fail("aspect_attrs is None.")
+    if not adapt:
+        fail("adapt is None.")
+    return struct(
+        aspect_attrs = aspect_attrs,
+        adapt = adapt,
+    )