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.documentsui.picker;
18 
19 import android.app.Activity;
20 import android.content.ContentResolver;
21 import android.content.ContentValues;
22 import android.database.Cursor;
23 import android.net.Uri;
24 import android.util.Log;
25 
26 import com.android.documentsui.base.DocumentStack;
27 import com.android.documentsui.base.Shared;
28 import com.android.documentsui.base.State;
29 import com.android.documentsui.roots.ProvidersAccess;
30 
31 import libcore.io.IoUtils;
32 
33 import java.io.IOException;
34 
35 import javax.annotation.Nullable;
36 
37 /**
38  * An interface that stores the last accessed stack of the caller
39  */
40 public interface LastAccessedStorage {
41 
getLastAccessed( Activity activity, ProvidersAccess providers, State state)42     @Nullable DocumentStack getLastAccessed(
43             Activity activity, ProvidersAccess providers, State state);
44 
setLastAccessed(Activity activity, DocumentStack stack)45     void setLastAccessed(Activity activity, DocumentStack stack);
46 
setLastAccessedToExternalApp(Activity activity)47     void setLastAccessedToExternalApp(Activity activity);
48 
create()49     static LastAccessedStorage create() {
50         return new RuntimeLastAccessedStorage();
51     }
52 
53     class RuntimeLastAccessedStorage implements LastAccessedStorage {
54 
55         private static final String TAG = "LastAccessedStorage";
56 
RuntimeLastAccessedStorage()57         private RuntimeLastAccessedStorage() {}
58 
59         @Override
getLastAccessed( Activity activity, ProvidersAccess providers, State state)60         public @Nullable DocumentStack getLastAccessed(
61                 Activity activity, ProvidersAccess providers, State state) {
62             final String packageName = Shared.getCallingPackageName(activity);
63             final Uri resumeUri = LastAccessedProvider.buildLastAccessed(packageName);
64             final ContentResolver resolver = activity.getContentResolver();
65             Cursor cursor = resolver.query(resumeUri, null, null, null, null);
66             try {
67                 return DocumentStack.fromLastAccessedCursor(
68                         cursor, providers.getMatchingRootsBlocking(state), resolver);
69             } catch (IOException e) {
70                 Log.w(TAG, "Failed to resume: ", e);
71             } finally {
72                 IoUtils.closeQuietly(cursor);
73             }
74 
75             return null;
76         }
77 
78         @Override
setLastAccessed(Activity activity, DocumentStack stack)79         public void setLastAccessed(Activity activity, DocumentStack stack) {
80             String packageName = Shared.getCallingPackageName(activity);
81             LastAccessedProvider.setLastAccessed(activity.getContentResolver(), packageName, stack);
82         }
83 
84         @Override
setLastAccessedToExternalApp(Activity activity)85         public void setLastAccessedToExternalApp(Activity activity) {
86             final String packageName = Shared.getCallingPackageName(activity);
87             final ContentValues values = new ContentValues();
88             values.put(LastAccessedProvider.Columns.EXTERNAL, 1);
89             activity.getContentResolver().insert(
90                     LastAccessedProvider.buildLastAccessed(packageName), values);
91         }
92     }
93 }
94