Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | package com.android.documentsui; |
| 17 | |
| 18 | import android.content.ContentResolver; |
| 19 | import android.database.Cursor; |
| 20 | import android.database.MatrixCursor; |
| 21 | import android.os.Bundle; |
| 22 | import android.provider.DocumentsContract.Root; |
| 23 | |
| 24 | import java.io.FileNotFoundException; |
| 25 | |
| 26 | /** |
| 27 | * Test provider w/ support for paging, and various sub-scenarios of paging. |
| 28 | */ |
| 29 | public class PagingProvider extends TestRootProvider { |
| 30 | |
| 31 | /** |
| 32 | * Pass test result size to inform the provider of the result size. Defaults to 1k. |
| 33 | */ |
Steve McKay | 71e84b9 | 2017-04-24 12:32:55 -0700 | [diff] [blame] | 34 | private static final String TEST_RECORDSET_COUNT = "test-recordset-size"; |
| 35 | private static final int DEFAULT_RECORDSET_COUNT = 100; |
| 36 | private static final int UNDETERMINED_RECORDSET_COUNT = -1; |
Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 37 | |
| 38 | private static final String ROOT_ID = "paging-root"; |
| 39 | private static final String ROOT_DOC_ID = "root0"; |
| 40 | private static final int ROOT_FLAGS = Root.FLAG_SUPPORTS_SEARCH | Root.FLAG_SUPPORTS_IS_CHILD; |
| 41 | |
| 42 | public PagingProvider() { |
| 43 | super("Paging Root", ROOT_ID, ROOT_FLAGS, ROOT_DOC_ID); |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public Cursor queryDocument(String documentId, String[] projection) |
| 48 | throws FileNotFoundException { |
| 49 | MatrixCursor c = createDocCursor(projection); |
| 50 | addFolder(c, documentId); |
| 51 | return c; |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | public Cursor queryChildDocuments( |
| 56 | String parentDocumentId, String[] projection, String sortOrder) |
| 57 | throws FileNotFoundException { |
| 58 | throw new UnsupportedOperationException(); |
| 59 | } |
| 60 | |
| 61 | @Override |
| 62 | public Cursor queryChildDocuments( |
| 63 | String parentDocumentId, String[] projection, Bundle queryArgs) |
| 64 | throws FileNotFoundException { |
| 65 | |
Steve McKay | 961f1ec | 2017-07-26 17:37:24 -0700 | [diff] [blame] | 66 | queryArgs = queryArgs != null ? queryArgs : Bundle.EMPTY; |
Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 67 | |
| 68 | MatrixCursor c = createDocCursor(projection); |
| 69 | Bundle extras = c.getExtras(); |
| 70 | |
| 71 | int offset = queryArgs.getInt(ContentResolver.QUERY_ARG_OFFSET, 0); |
| 72 | int limit = queryArgs.getInt(ContentResolver.QUERY_ARG_LIMIT, Integer.MIN_VALUE); |
Steve McKay | 71e84b9 | 2017-04-24 12:32:55 -0700 | [diff] [blame] | 73 | int recordsetSize = queryArgs.getInt(TEST_RECORDSET_COUNT, DEFAULT_RECORDSET_COUNT); |
Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 74 | |
| 75 | // Can be -1 (magic unknown), or 0 or more, but not less than -1. |
| 76 | assert(recordsetSize > -2); |
| 77 | |
| 78 | // Client may force override the recordset size to -1 which is MAGIC unknown value. |
| 79 | // Even if, we still need some finite number against to work. |
Steve McKay | 71e84b9 | 2017-04-24 12:32:55 -0700 | [diff] [blame] | 80 | int size = (recordsetSize == UNDETERMINED_RECORDSET_COUNT) |
| 81 | ? DEFAULT_RECORDSET_COUNT |
Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 82 | : recordsetSize; |
| 83 | |
| 84 | // Calculate the number of items to include in the cursor. |
| 85 | int numItems = (limit >= 0) |
| 86 | ? Math.min(limit, size - offset) |
| 87 | : size - offset; |
| 88 | |
| 89 | assert(offset >= 0); |
| 90 | assert(numItems >= 0); |
| 91 | for (int i = 0; i < numItems; i++) { |
| 92 | addFile(c, String.format("%05d", offset + i)); |
| 93 | } |
Steve McKay | 71e84b9 | 2017-04-24 12:32:55 -0700 | [diff] [blame] | 94 | extras.putInt(ContentResolver.EXTRA_TOTAL_COUNT, recordsetSize); |
Steve McKay | ffc1108 | 2017-01-17 11:12:08 -0800 | [diff] [blame] | 95 | return c; |
| 96 | } |
| 97 | } |