1/*
2 * Copyright (C) 2014 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 android.support.v4.provider;
18
19import android.content.ContentResolver;
20import android.content.Context;
21import android.database.Cursor;
22import android.net.Uri;
23import android.provider.DocumentsContract;
24import android.util.Log;
25
26import java.util.ArrayList;
27
28class DocumentsContractApi21 {
29    private static final String TAG = "DocumentFile";
30
31    public static Uri createFile(Context context, Uri self, String mimeType,
32            String displayName) {
33        return DocumentsContract.createDocument(context.getContentResolver(), self, mimeType,
34                displayName);
35    }
36
37    public static Uri createDirectory(Context context, Uri self, String displayName) {
38        return createFile(context, self, DocumentsContract.Document.MIME_TYPE_DIR, displayName);
39    }
40
41    public static Uri prepareTreeUri(Uri treeUri) {
42        return DocumentsContract.buildDocumentUriUsingTree(treeUri,
43                DocumentsContract.getTreeDocumentId(treeUri));
44    }
45
46    public static Uri[] listFiles(Context context, Uri self) {
47        final ContentResolver resolver = context.getContentResolver();
48        final Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(self,
49                DocumentsContract.getDocumentId(self));
50        final ArrayList<Uri> results = new ArrayList<Uri>();
51
52        Cursor c = null;
53        try {
54            c = resolver.query(childrenUri, new String[] {
55                    DocumentsContract.Document.COLUMN_DOCUMENT_ID }, null, null, null);
56            while (c.moveToNext()) {
57                final String documentId = c.getString(0);
58                final Uri documentUri = DocumentsContract.buildDocumentUriUsingTree(self,
59                        documentId);
60                results.add(documentUri);
61            }
62        } catch (Exception e) {
63            Log.w(TAG, "Failed query: " + e);
64        } finally {
65            closeQuietly(c);
66        }
67
68        return results.toArray(new Uri[results.size()]);
69    }
70
71    public static Uri renameTo(Context context, Uri self, String displayName) {
72        return DocumentsContract.renameDocument(context.getContentResolver(), self, displayName);
73    }
74
75    private static void closeQuietly(AutoCloseable closeable) {
76        if (closeable != null) {
77            try {
78                closeable.close();
79            } catch (RuntimeException rethrown) {
80                throw rethrown;
81            } catch (Exception ignored) {
82            }
83        }
84    }
85}
86