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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.intelligence.search.sitemap;
     18 
     19 import android.content.Context;
     20 import android.database.Cursor;
     21 import android.database.sqlite.SQLiteDatabase;
     22 import android.support.annotation.WorkerThread;
     23 import android.text.TextUtils;
     24 import android.util.Log;
     25 
     26 import com.android.settings.intelligence.search.indexing.IndexDatabaseHelper;
     27 import com.android.settings.intelligence.search.indexing.IndexDatabaseHelper.SiteMapColumns;
     28 
     29 import java.util.ArrayList;
     30 import java.util.List;
     31 
     32 public class SiteMapManager {
     33 
     34     private static final String TAG = "SiteMapManager";
     35     private static final boolean DEBUG_TIMING = false;
     36 
     37     public static final String[] SITE_MAP_COLUMNS = {
     38             SiteMapColumns.PARENT_CLASS,
     39             SiteMapColumns.PARENT_TITLE,
     40             SiteMapColumns.CHILD_CLASS,
     41             SiteMapColumns.CHILD_TITLE
     42     };
     43 
     44     private final List<SiteMapPair> mPairs = new ArrayList<>();
     45 
     46     private boolean mInitialized;
     47 
     48     /**
     49      * Given a fragment class name and its screen title, build a breadcrumb from Settings root to
     50      * this screen.
     51      * <p/>
     52      * Not all screens have a full breadcrumb path leading up to root, it's because either some
     53      * page in the breadcrumb path is not indexed, or it's only reachable via search.
     54      */
     55     @WorkerThread
     56     public synchronized List<String> buildBreadCrumb(Context context, String clazz,
     57             String screenTitle) {
     58         init(context);
     59         final long startTime = System.currentTimeMillis();
     60         final List<String> breadcrumbs = new ArrayList<>();
     61         if (!mInitialized) {
     62             Log.w(TAG, "SiteMap is not initialized yet, skipping");
     63             return breadcrumbs;
     64         }
     65         breadcrumbs.add(screenTitle);
     66         String currentClass = clazz;
     67         String currentTitle = screenTitle;
     68         // Look up current page's parent, if found add it to breadcrumb string list, and repeat.
     69         while (true) {
     70             final SiteMapPair pair = lookUpParent(currentClass, currentTitle);
     71             if (pair == null) {
     72                 if (DEBUG_TIMING) {
     73                     Log.d(TAG, "BreadCrumb timing: " + (System.currentTimeMillis() - startTime));
     74                 }
     75                 return breadcrumbs;
     76             }
     77             breadcrumbs.add(0, pair.getParentTitle());
     78             currentClass = pair.getParentClass();
     79             currentTitle = pair.getParentTitle();
     80         }
     81     }
     82 
     83     /**
     84      * Initialize a list of {@link SiteMapPair}s. Each pair knows about a single parent-child
     85      * page relationship.
     86      */
     87     @WorkerThread
     88     private synchronized void init(Context context) {
     89         if (mInitialized) {
     90             // Make sure only init once.
     91             return;
     92         }
     93         final long startTime = System.currentTimeMillis();
     94         // First load site map from static index table.
     95         final Context appContext = context.getApplicationContext();
     96         final SQLiteDatabase db = IndexDatabaseHelper.getInstance(appContext).getReadableDatabase();
     97         Cursor sitemap = db.query(IndexDatabaseHelper.Tables.TABLE_SITE_MAP, SITE_MAP_COLUMNS, null,
     98                 null, null, null, null);
     99         while (sitemap.moveToNext()) {
    100             final SiteMapPair pair = new SiteMapPair(
    101                     sitemap.getString(sitemap.getColumnIndex(SiteMapColumns.PARENT_CLASS)),
    102                     sitemap.getString(sitemap.getColumnIndex(SiteMapColumns.PARENT_TITLE)),
    103                     sitemap.getString(sitemap.getColumnIndex(SiteMapColumns.CHILD_CLASS)),
    104                     sitemap.getString(sitemap.getColumnIndex(SiteMapColumns.CHILD_TITLE)));
    105             mPairs.add(pair);
    106         }
    107         sitemap.close();
    108         // Done.
    109         mInitialized = true;
    110         if (DEBUG_TIMING) {
    111             Log.d(TAG, "Init timing: " + (System.currentTimeMillis() - startTime));
    112         }
    113     }
    114 
    115     @WorkerThread
    116     private SiteMapPair lookUpParent(String clazz, String title) {
    117         for (SiteMapPair pair : mPairs) {
    118             if (TextUtils.equals(pair.getChildClass(), clazz)
    119                     && TextUtils.equals(title, pair.getChildTitle())) {
    120                 return pair;
    121             }
    122         }
    123         return null;
    124     }
    125 
    126 }