1/*
2 * Copyright (C) 2011 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
17package com.android.email.widget;
18
19import android.content.Context;
20import android.content.SharedPreferences;
21import android.util.Log;
22
23import com.android.email.Email;
24import com.android.emailcommon.Logging;
25import com.android.emailcommon.provider.Account;
26import com.android.emailcommon.provider.Mailbox;
27
28import java.io.FileDescriptor;
29import java.io.PrintWriter;
30import java.util.Map;
31import java.util.concurrent.ConcurrentHashMap;
32
33/**
34 * Class that maintains references to all widgets.
35 */
36public class WidgetManager {
37    private static final String PREFS_NAME = "com.android.email.widget.WidgetManager";
38    private static final String ACCOUNT_ID_PREFIX = "accountId_";
39    private static final String MAILBOX_ID_PREFIX = "mailboxId_";
40
41    private final static WidgetManager sInstance = new WidgetManager();
42
43    // Widget ID -> Widget
44    private final static Map<Integer, EmailWidget> mWidgets =
45            new ConcurrentHashMap<Integer, EmailWidget>();
46
47    private WidgetManager() {
48    }
49
50    public static WidgetManager getInstance() {
51        return sInstance;
52    }
53
54    public synchronized void createWidgets(Context context, int[] widgetIds) {
55        for (int widgetId : widgetIds) {
56            getOrCreateWidget(context, widgetId);
57        }
58    }
59
60    public synchronized void deleteWidgets(Context context, int[] widgetIds) {
61        for (int widgetId : widgetIds) {
62            // Find the widget in the map
63            final EmailWidget widget = WidgetManager.getInstance().get(widgetId);
64            if (widget != null) {
65                // Stop loading and remove the widget from the map
66                widget.onDeleted();
67            }
68            remove(context, widgetId);
69        }
70    }
71
72    public synchronized void updateWidgets(Context context, int[] widgetIds) {
73        for (int widgetId : widgetIds) {
74            // Find the widget in the map
75            final EmailWidget widget = WidgetManager.getInstance().get(widgetId);
76            if (widget != null) {
77                widget.reset();
78            } else {
79                getOrCreateWidget(context, widgetId);
80            }
81        }
82    }
83
84    public synchronized EmailWidget getOrCreateWidget(Context context, int widgetId) {
85        EmailWidget widget = WidgetManager.getInstance().get(widgetId);
86        if (widget == null) {
87            if (Logging.DEBUG_LIFECYCLE && Email.DEBUG) {
88                Log.d(EmailWidget.TAG, "Create email widget; ID: " + widgetId);
89            }
90            widget = new EmailWidget(context, widgetId);
91            put(widgetId, widget);
92            widget.start();
93        }
94        return widget;
95    }
96
97    private EmailWidget get(int widgetId) {
98        return mWidgets.get(widgetId);
99    }
100
101    private void put(int widgetId, EmailWidget widget) {
102        mWidgets.put(widgetId, widget);
103    }
104
105    private void remove(Context context, int widgetId) {
106        mWidgets.remove(widgetId);
107        WidgetManager.removeWidgetPrefs(context, widgetId);
108    }
109
110    public void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
111        int n = 0;
112        for (EmailWidget widget : mWidgets.values()) {
113            writer.println("Widget #" + (++n));
114            writer.println("    " + widget.toString());
115        }
116    }
117
118    /** Saves shared preferences for the given widget */
119    static void saveWidgetPrefs(Context context, int appWidgetId, long accountId, long mailboxId) {
120        SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
121        prefs.edit()
122            .putLong(ACCOUNT_ID_PREFIX + appWidgetId, accountId)
123            .putLong(MAILBOX_ID_PREFIX + appWidgetId, mailboxId)
124            .commit();    // preferences must be committed before we return
125    }
126
127    /** Removes shared preferences for the given widget */
128    static void removeWidgetPrefs(Context context, int appWidgetId) {
129        SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
130        SharedPreferences.Editor editor = prefs.edit();
131        for (String key : prefs.getAll().keySet()) {
132            if (key.endsWith("_" + appWidgetId)) {
133                editor.remove(key);
134            }
135        }
136        editor.apply();   // just want to clean up; don't care when preferences are actually removed
137    }
138
139    /**
140     * Returns the saved account ID for the given widget. Otherwise, {@link Account#NO_ACCOUNT} if
141     * the account ID was not previously saved.
142     */
143    static long loadAccountIdPref(Context context, int appWidgetId) {
144        SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
145        long accountId = prefs.getLong(ACCOUNT_ID_PREFIX + appWidgetId, Account.NO_ACCOUNT);
146        return accountId;
147    }
148
149    /**
150     * Returns the saved mailbox ID for the given widget. Otherwise, {@link Mailbox#NO_MAILBOX} if
151     * the mailbox ID was not previously saved.
152     */
153    static long loadMailboxIdPref(Context context, int appWidgetId) {
154        SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
155        long mailboxId = prefs.getLong(MAILBOX_ID_PREFIX + appWidgetId, Mailbox.NO_MAILBOX);
156        return mailboxId;
157    }
158}
159