Add InspectionCompanionProvider

Bug: 117616612
Test: atest GeneratedInspectionCompanionProviderTest
Change-Id: I7998f4f8d9fdbb042e01b5b0c2fc66933b2035d1

2 files changed, 84 insertions, 0 deletions

diff --git a/core/java/android/view/inspector/GeneratedInspectionCompanionProvider.java b/core/java/android/view/inspector/GeneratedInspectionCompanionProvider.java
new file mode 100644
index 000000000000..8faae1f1da98
--- /dev/null
+++ b/core/java/android/view/inspector/GeneratedInspectionCompanionProvider.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2019 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 android.view.inspector;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+
+/**
+ * An inspection companion provider that loads pre-generated inspection companions
+ *
+ * @see android.processor.view.inspector.PlatformInspectableProcessor
+ */
+public class GeneratedInspectionCompanionProvider implements InspectionCompanionProvider {
+    /**
+     * The suffix used for the generated class
+     */
+    private static final String COMPANION_SUFFIX = "$$InspectionCompanion";
+
+    @Override
+    @Nullable
+    @SuppressWarnings("unchecked")
+    public <T> InspectionCompanion<T> provide(@NonNull Class<T> cls) {
+        final String companionName = cls.getName() + COMPANION_SUFFIX;
+
+        try {
+            final Class<InspectionCompanion<T>> companionClass =
+                    (Class<InspectionCompanion<T>>) cls.getClassLoader().loadClass(companionName);
+            return companionClass.newInstance();
+        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
+            return null;
+        }
+    }
+}
diff --git a/core/java/android/view/inspector/InspectionCompanionProvider.java b/core/java/android/view/inspector/InspectionCompanionProvider.java
new file mode 100644
index 000000000000..c08f49c611ee
--- /dev/null
+++ b/core/java/android/view/inspector/InspectionCompanionProvider.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2019 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 android.view.inspector;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+
+/**
+ * An interface for services that can provide inspection companions for a class.
+ */
+public interface InspectionCompanionProvider {
+    /**
+     * Provide an {@link InspectionCompanion} for the supplied class.
+     *
+     * Implementing classes must not cache companion instances, and should instantiate a new one
+     * for each request.
+     *
+     * @param cls A {@link Class} representing the inspectable type
+     * @param <T> The type to find the companion for
+     * @return The inspection companion for the supplied type
+     */
+    @Nullable
+    <T> InspectionCompanion<T> provide(@NonNull Class<T> cls);
+}