Jeff Sharkey | 9e0036e | 2013-04-26 16:54:55 -0700 | [diff] [blame] | 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.externalstorage; |
| 18 | |
| 19 | import android.content.ContentProvider; |
| 20 | import android.content.ContentResolver; |
| 21 | import android.content.ContentValues; |
| 22 | import android.content.UriMatcher; |
| 23 | import android.database.Cursor; |
| 24 | import android.database.MatrixCursor; |
| 25 | import android.net.Uri; |
| 26 | import android.os.Environment; |
| 27 | import android.os.ParcelFileDescriptor; |
| 28 | import android.provider.BaseColumns; |
| 29 | import android.provider.DocumentsContract; |
| 30 | import android.provider.DocumentsContract.DocumentColumns; |
| 31 | import android.webkit.MimeTypeMap; |
| 32 | |
| 33 | import com.android.internal.annotations.GuardedBy; |
| 34 | import com.google.android.collect.Lists; |
| 35 | |
| 36 | import java.io.File; |
| 37 | import java.io.FileNotFoundException; |
| 38 | import java.util.ArrayList; |
| 39 | |
| 40 | public class ExternalStorageProvider extends ContentProvider { |
| 41 | private static final String TAG = "ExternalStorage"; |
| 42 | |
| 43 | private static final String AUTHORITY = "com.android.externalstorage"; |
| 44 | |
| 45 | // TODO: support searching |
| 46 | // TODO: support multiple storage devices |
| 47 | // TODO: persist GUIDs across launches |
| 48 | |
| 49 | private static final UriMatcher sMatcher = new UriMatcher(UriMatcher.NO_MATCH); |
| 50 | |
| 51 | private static final int URI_DOCS_ID = 1; |
| 52 | private static final int URI_DOCS_ID_CONTENTS = 2; |
| 53 | private static final int URI_SEARCH = 3; |
| 54 | |
| 55 | static { |
| 56 | sMatcher.addURI(AUTHORITY, "docs/#", URI_DOCS_ID); |
| 57 | sMatcher.addURI(AUTHORITY, "docs/#/contents", URI_DOCS_ID_CONTENTS); |
| 58 | sMatcher.addURI(AUTHORITY, "search", URI_SEARCH); |
| 59 | } |
| 60 | |
| 61 | @GuardedBy("mFiles") |
| 62 | private ArrayList<File> mFiles = Lists.newArrayList(); |
| 63 | |
| 64 | @Override |
| 65 | public boolean onCreate() { |
| 66 | mFiles.clear(); |
| 67 | mFiles.add(Environment.getExternalStorageDirectory()); |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, |
| 73 | String sortOrder) { |
| 74 | |
| 75 | // TODO: support custom projections |
| 76 | projection = new String[] { |
| 77 | BaseColumns._ID, |
| 78 | DocumentColumns.DISPLAY_NAME, DocumentColumns.SIZE, DocumentColumns.GUID, |
| 79 | DocumentColumns.MIME_TYPE, DocumentColumns.LAST_MODIFIED, DocumentColumns.FLAGS }; |
| 80 | |
| 81 | final MatrixCursor cursor = new MatrixCursor(projection); |
| 82 | switch (sMatcher.match(uri)) { |
| 83 | case URI_DOCS_ID: { |
| 84 | final int id = Integer.parseInt(uri.getPathSegments().get(1)); |
| 85 | synchronized (mFiles) { |
| 86 | includeFileLocked(cursor, id); |
| 87 | } |
| 88 | break; |
| 89 | } |
| 90 | case URI_DOCS_ID_CONTENTS: { |
| 91 | final int parentId = Integer.parseInt(uri.getPathSegments().get(1)); |
| 92 | synchronized (mFiles) { |
| 93 | final File parent = mFiles.get(parentId); |
| 94 | for (File file : parent.listFiles()) { |
| 95 | final int id = findOrCreateFileLocked(file); |
| 96 | includeFileLocked(cursor, id); |
| 97 | } |
| 98 | } |
| 99 | break; |
| 100 | } |
| 101 | default: { |
| 102 | cursor.close(); |
| 103 | throw new UnsupportedOperationException("Unsupported Uri " + uri); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | return cursor; |
| 108 | } |
| 109 | |
| 110 | private int findOrCreateFileLocked(File file) { |
| 111 | int id = mFiles.indexOf(file); |
| 112 | if (id == -1) { |
| 113 | id = mFiles.size(); |
| 114 | mFiles.add(file); |
| 115 | } |
| 116 | return id; |
| 117 | } |
| 118 | |
| 119 | private void includeFileLocked(MatrixCursor cursor, int id) { |
| 120 | final File file = mFiles.get(id); |
| 121 | int flags = 0; |
| 122 | |
| 123 | if (file.isDirectory() && file.canWrite()) { |
| 124 | flags |= DocumentsContract.FLAG_SUPPORTS_CREATE; |
| 125 | } |
| 126 | if (file.canWrite()) { |
| 127 | flags |= DocumentsContract.FLAG_SUPPORTS_RENAME; |
| 128 | } |
| 129 | |
| 130 | final String mimeType = getTypeLocked(id); |
| 131 | if (mimeType.startsWith("image/")) { |
| 132 | flags |= DocumentsContract.FLAG_SUPPORTS_THUMBNAIL; |
| 133 | } |
| 134 | |
| 135 | cursor.addRow(new Object[] { |
| 136 | id, file.getName(), file.length(), id, mimeType, file.lastModified(), flags }); |
| 137 | } |
| 138 | |
| 139 | @Override |
| 140 | public String getType(Uri uri) { |
| 141 | switch (sMatcher.match(uri)) { |
| 142 | case URI_DOCS_ID: { |
| 143 | final int id = Integer.parseInt(uri.getPathSegments().get(1)); |
| 144 | synchronized (mFiles) { |
| 145 | return getTypeLocked(id); |
| 146 | } |
| 147 | } |
| 148 | default: { |
| 149 | throw new UnsupportedOperationException("Unsupported Uri " + uri); |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | private String getTypeLocked(int id) { |
| 155 | final File file = mFiles.get(id); |
| 156 | |
| 157 | if (file.isDirectory()) { |
| 158 | return DocumentsContract.MIME_TYPE_DIRECTORY; |
| 159 | } |
| 160 | |
| 161 | final int lastDot = file.getName().lastIndexOf('.'); |
| 162 | if (lastDot >= 0) { |
| 163 | final String extension = file.getName().substring(lastDot + 1); |
| 164 | final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension); |
| 165 | if (mime != null) { |
| 166 | return mime; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | return "application/octet-stream"; |
| 171 | } |
| 172 | |
| 173 | @Override |
| 174 | public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException { |
| 175 | switch (sMatcher.match(uri)) { |
| 176 | case URI_DOCS_ID: { |
| 177 | final int id = Integer.parseInt(uri.getPathSegments().get(1)); |
| 178 | synchronized (mFiles) { |
| 179 | final File file = mFiles.get(id); |
| 180 | // TODO: turn into thumbnail |
| 181 | return ParcelFileDescriptor.open(file, ContentResolver.modeToMode(uri, mode)); |
| 182 | } |
| 183 | } |
| 184 | default: { |
| 185 | throw new UnsupportedOperationException("Unsupported Uri " + uri); |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | @Override |
| 191 | public Uri insert(Uri uri, ContentValues values) { |
| 192 | throw new UnsupportedOperationException(); |
| 193 | } |
| 194 | |
| 195 | @Override |
| 196 | public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { |
| 197 | throw new UnsupportedOperationException(); |
| 198 | } |
| 199 | |
| 200 | @Override |
| 201 | public int delete(Uri uri, String selection, String[] selectionArgs) { |
| 202 | throw new UnsupportedOperationException(); |
| 203 | } |
| 204 | } |