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diff --git a/java/com/android/dialer/rootcomponentgenerator/annotation/InstallIn.java b/java/com/android/dialer/rootcomponentgenerator/annotation/InstallIn.java
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+++ b/java/com/android/dialer/rootcomponentgenerator/annotation/InstallIn.java
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+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.android.dialer.rootcomponentgenerator.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation for {@link dagger.Module dagger.Modules} which causes them to be installed in the
+ * specified variants.
+ *
+ * <p>It has a parameter for users to enter on which variants annotated module will be installed and
+ * also must be non-empty. Example:
+ *
+ * <pre>
+ * <code>
+ * @InstallIn(variants = {DialerVariant.DIALER_AOSP, DialerVariant.DIALER_TEST})
+ * public class Module1 {}
+ *
+ * </code>
+ * </pre>
+ */
+@Target(ElementType.TYPE)
+public @interface InstallIn {
+  DialerVariant[] variants();
+}