Extracting search algorithm in an interface to make it easier to change the search behavior

Change-Id: I0b1d1387c78d13ef749aac39d5c8167c2909716a

src/com/android/launcher3/allapps/search/SearchAlgorithm.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2017 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.allapps.search;
+
+/**
+ * An interface for handling search.
+ */
+public interface SearchAlgorithm {
+
+    /**
+     * Performs search and sends the result to the callback.
+     */
+    void doSearch(String query, AllAppsSearchBarController.Callbacks callback);
+
+    /**
+     * Cancels any active request.
+     */
+    void cancel(boolean interruptActiveRequests);
+}