| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.documentsui; |
| |
| import static com.android.documentsui.DocumentsActivity.TAG; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ProviderInfo; |
| import android.content.pm.ResolveInfo; |
| import android.database.Cursor; |
| import android.graphics.drawable.Drawable; |
| import android.net.Uri; |
| import android.provider.DocumentsContract; |
| import android.util.Log; |
| import android.util.Pair; |
| |
| import com.android.documentsui.model.DocumentsProviderInfo; |
| import com.android.documentsui.model.DocumentsProviderInfo.Icon; |
| import com.android.documentsui.model.Root; |
| import com.android.internal.annotations.GuardedBy; |
| import com.google.android.collect.Lists; |
| import com.google.android.collect.Maps; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| /** |
| * Cache of known storage backends and their roots. |
| */ |
| public class RootsCache { |
| |
| // TODO: cache roots in local provider to avoid spinning up backends |
| |
| private static boolean sCached = false; |
| |
| /** Map from authority to cached info */ |
| private static HashMap<String, DocumentsProviderInfo> sProviders = Maps.newHashMap(); |
| /** Map from (authority+rootId) to cached info */ |
| private static HashMap<Pair<String, String>, Root> sRoots = Maps.newHashMap(); |
| |
| public static ArrayList<Root> sRootsList = Lists.newArrayList(); |
| |
| private static Root sRecentOpenRoot; |
| |
| /** |
| * Gather roots from all known storage providers. |
| */ |
| private static void ensureCache(Context context) { |
| if (sCached) return; |
| sCached = true; |
| |
| sProviders.clear(); |
| sRoots.clear(); |
| sRootsList.clear(); |
| |
| { |
| // Create special root for recents |
| final Root root = Root.buildRecentOpen(context); |
| sRootsList.add(root); |
| sRecentOpenRoot = root; |
| } |
| |
| // Query for other storage backends |
| final PackageManager pm = context.getPackageManager(); |
| final List<ProviderInfo> providers = pm.queryContentProviders( |
| null, -1, PackageManager.GET_META_DATA); |
| for (ProviderInfo providerInfo : providers) { |
| if (providerInfo.metaData != null && providerInfo.metaData.containsKey( |
| DocumentsContract.META_DATA_DOCUMENT_PROVIDER)) { |
| final DocumentsProviderInfo info = DocumentsProviderInfo.parseInfo( |
| context, providerInfo); |
| if (info == null) { |
| Log.w(TAG, "Missing info for " + providerInfo); |
| continue; |
| } |
| |
| sProviders.put(info.providerInfo.authority, info); |
| |
| // TODO: remove deprecated customRoots flag |
| // TODO: populate roots on background thread, and cache results |
| final Uri uri = DocumentsContract.buildRootsUri(providerInfo.authority); |
| final Cursor cursor = context.getContentResolver() |
| .query(uri, null, null, null, null); |
| try { |
| while (cursor.moveToNext()) { |
| final Root root = Root.fromCursor(context, info, cursor); |
| sRoots.put(Pair.create(info.providerInfo.authority, root.rootId), root); |
| sRootsList.add(root); |
| } |
| } finally { |
| cursor.close(); |
| } |
| } |
| } |
| } |
| |
| @GuardedBy("ActivityThread") |
| public static DocumentsProviderInfo findProvider(Context context, String authority) { |
| ensureCache(context); |
| return sProviders.get(authority); |
| } |
| |
| @GuardedBy("ActivityThread") |
| public static Root findRoot(Context context, String authority, String rootId) { |
| ensureCache(context); |
| return sRoots.get(Pair.create(authority, rootId)); |
| } |
| |
| @GuardedBy("ActivityThread") |
| public static Root getRecentOpenRoot(Context context) { |
| ensureCache(context); |
| return sRecentOpenRoot; |
| } |
| |
| @GuardedBy("ActivityThread") |
| public static Collection<Root> getRoots() { |
| return sRootsList; |
| } |
| |
| @GuardedBy("ActivityThread") |
| public static Drawable resolveDocumentIcon(Context context, String authority, String mimeType) { |
| // Custom icons take precedence |
| ensureCache(context); |
| final DocumentsProviderInfo info = sProviders.get(authority); |
| if (info != null) { |
| for (Icon icon : info.customIcons) { |
| if (MimePredicate.mimeMatches(icon.mimeType, mimeType)) { |
| return icon.icon; |
| } |
| } |
| } |
| |
| if (DocumentsContract.MIME_TYPE_DIRECTORY.equals(mimeType)) { |
| return context.getResources().getDrawable(R.drawable.ic_dir); |
| } else { |
| final PackageManager pm = context.getPackageManager(); |
| final Intent intent = new Intent(Intent.ACTION_VIEW); |
| intent.setType(mimeType); |
| |
| final ResolveInfo activityInfo = pm.resolveActivity( |
| intent, PackageManager.MATCH_DEFAULT_ONLY); |
| if (activityInfo != null) { |
| return activityInfo.loadIcon(pm); |
| } else { |
| return null; |
| } |
| } |
| } |
| } |