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      1 /*
      2  * Copyright (C) 2013 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.calendar.selectcalendars;
     18 
     19 import android.content.Context;
     20 import android.database.Cursor;
     21 import android.provider.CalendarContract.Colors;
     22 
     23 import com.android.calendar.AsyncQueryService;
     24 
     25 import java.util.HashSet;
     26 
     27 /**
     28  * CalendarColorCache queries the provider and stores the account identifiers (name and type)
     29  * of the accounts which contain optional calendar colors, and thus should allow for the
     30  * user to choose calendar colors.
     31  */
     32 public class CalendarColorCache {
     33 
     34     private HashSet<String> mCache = new HashSet<String>();
     35 
     36     private static final String SEPARATOR = "::";
     37 
     38     private AsyncQueryService mService;
     39     private OnCalendarColorsLoadedListener mListener;
     40 
     41     private StringBuffer mStringBuffer = new StringBuffer();
     42 
     43     private static String[] PROJECTION = new String[] {Colors.ACCOUNT_NAME, Colors.ACCOUNT_TYPE };
     44 
     45     /**
     46      * Interface which provides callback after provider query of calendar colors.
     47      */
     48     public interface OnCalendarColorsLoadedListener {
     49 
     50         /**
     51          * Callback after the set of accounts with additional calendar colors are loaded.
     52          */
     53         void onCalendarColorsLoaded();
     54     }
     55 
     56     public CalendarColorCache(Context context, OnCalendarColorsLoadedListener listener) {
     57         mListener = listener;
     58         mService = new AsyncQueryService(context) {
     59 
     60             @Override
     61             public void onQueryComplete(int token, Object cookie, Cursor c) {
     62                 if (c == null) {
     63                     return;
     64                 }
     65                 if (c.moveToFirst()) {
     66                     clear();
     67                     do {
     68                         insert(c.getString(0), c.getString(1));
     69                     } while (c.moveToNext());
     70                     mListener.onCalendarColorsLoaded();
     71                 }
     72                 if (c != null) {
     73                     c.close();
     74                 }
     75             }
     76         };
     77         mService.startQuery(0, null, Colors.CONTENT_URI, PROJECTION,
     78                 Colors.COLOR_TYPE + "=" + Colors.TYPE_CALENDAR, null, null);
     79     }
     80 
     81     /**
     82      * Inserts a specified account into the set.
     83      */
     84     private void insert(String accountName, String accountType) {
     85         mCache.add(generateKey(accountName, accountType));
     86     }
     87 
     88     /**
     89      * Does a set lookup to determine if a specified account has more optional calendar colors.
     90      */
     91     public boolean hasColors(String accountName, String accountType) {
     92         return mCache.contains(generateKey(accountName, accountType));
     93     }
     94 
     95     /**
     96      * Clears the cached set.
     97      */
     98     private void clear() {
     99         mCache.clear();
    100     }
    101 
    102     /**
    103      * Generates a single key based on account name and account type for map lookup/insertion.
    104      */
    105     private String generateKey(String accountName, String accountType) {
    106         mStringBuffer.setLength(0);
    107         return mStringBuffer.append(accountName).append(SEPARATOR).append(accountType).toString();
    108     }
    109 }
    110