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

/*
 * Copyright (C) 2020 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;

import android.content.Context;
import android.os.CancellationSignal;

import com.android.launcher3.LauncherAppState;
import com.android.launcher3.allapps.AllAppsGridAdapter.AdapterItem;
import com.android.launcher3.allapps.AllAppsSectionDecorator.SectionDecorationHandler;
import com.android.launcher3.model.AllAppsList;
import com.android.launcher3.model.BaseModelUpdateTask;
import com.android.launcher3.model.BgDataModel;
import com.android.launcher3.model.data.AppInfo;
import com.android.launcher3.search.StringMatcherUtility;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;

/**
 * A device search section for handling app searches
 */
public class AppsSearchPipeline implements SearchPipeline {

    private static final int MAX_RESULTS_COUNT = 5;

    private final SectionDecorationInfo mSearchSectionInfo;
    private final LauncherAppState mLauncherAppState;

    public AppsSearchPipeline(Context context, LauncherAppState launcherAppState) {
        mLauncherAppState = launcherAppState;
        mSearchSectionInfo = new SectionDecorationInfo();
        mSearchSectionInfo.setDecorationHandler(
                new SectionDecorationHandler(context, true, 0, true, true));
    }

    @Override
    public void query(String input, Consumer<ArrayList<AdapterItem>> callback,
            CancellationSignal cancellationSignal) {
        mLauncherAppState.getModel().enqueueModelUpdateTask(new BaseModelUpdateTask() {
            @Override
            public void execute(LauncherAppState app, BgDataModel dataModel, AllAppsList apps) {
                List<AppInfo> matchingResults = getTitleMatchResult(apps.data, input);
                callback.accept(getAdapterItems(matchingResults));
            }
        });
    }

    /**
     * Filters {@link AppInfo}s matching specified query
     */
    public static ArrayList<AppInfo> getTitleMatchResult(List<AppInfo> apps, String query) {
        // Do an intersection of the words in the query and each title, and filter out all the
        // apps that don't match all of the words in the query.
        final String queryTextLower = query.toLowerCase();
        final ArrayList<AppInfo> result = new ArrayList<>();
        StringMatcherUtility.StringMatcher matcher =
                StringMatcherUtility.StringMatcher.getInstance();
        for (AppInfo info : apps) {
            if (StringMatcherUtility.matches(queryTextLower, info.title.toString(), matcher)) {
                result.add(info);
            }
        }
        return result;
    }

    private ArrayList<AdapterItem> getAdapterItems(List<AppInfo> matchingApps) {
        ArrayList<AdapterItem> items = new ArrayList<>();
        for (int i = 0; i < matchingApps.size() && i < MAX_RESULTS_COUNT; i++) {
            AdapterItem appItem = AdapterItem.asApp(i, "", matchingApps.get(i), i);
            appItem.sectionDecorationInfo = mSearchSectionInfo;
            items.add(appItem);
        }

        return items;
    }
}