Merge "Interface for WidgetPickerSearchPipeline." into sc-dev

src/com/android/launcher3/widget/picker/search/WidgetsPickerSearchPipeline.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 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.launcher3.widget.picker.search;
+
+import com.android.launcher3.widget.model.WidgetsListBaseEntry;
+
+import java.util.List;
+import java.util.function.Consumer;
+
+/**
+ * An interface for a pipeline to handle widgets search.
+ */
+public interface WidgetsPickerSearchPipeline {
+
+    /**
+     * Performs a search query asynchronically. Invokes {@code callback} when the search is
+     * complete.
+     */
+    void query(String input, Consumer<List<WidgetsListBaseEntry>> callback);
+
+    /**
+     * Cancels any ongoing search request.
+     */
+    default void cancel() {};
+
+    /**
+     * Cleans up after search is no longer needed.
+     */
+    default void destroy() {};
+}