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/*
* 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.ContentProviderClient;
import android.content.ContentResolver;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.ProviderInfo;
import android.database.Cursor;
import android.net.Uri;
import android.provider.DocumentsContract;
import android.provider.DocumentsContract.Root;
import android.util.Log;
import com.android.documentsui.DocumentsActivity.State;
import com.android.documentsui.model.RootInfo;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.util.Objects;
import com.google.android.collect.Lists;
import libcore.io.IoUtils;
import java.util.ArrayList;
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
// TODO: root updates should trigger UI refresh
private static final boolean RECENTS_ENABLED = true;
private final Context mContext;
public List<RootInfo> mRoots = Lists.newArrayList();
private RootInfo mRecentsRoot;
public RootsCache(Context context) {
mContext = context;
update();
}
/**
* Gather roots from all known storage providers.
*/
@GuardedBy("ActivityThread")
public void update() {
mRoots.clear();
if (RECENTS_ENABLED) {
// Create special root for recents
final RootInfo root = new RootInfo();
root.rootType = Root.ROOT_TYPE_SHORTCUT;
root.icon = R.drawable.ic_root_recent;
root.flags = Root.FLAG_LOCAL_ONLY | Root.FLAG_SUPPORTS_CREATE;
root.title = mContext.getString(R.string.root_recent);
root.availableBytes = -1;
mRoots.add(root);
mRecentsRoot = root;
}
// Query for other storage backends
final ContentResolver resolver = mContext.getContentResolver();
final PackageManager pm = mContext.getPackageManager();
final List<ProviderInfo> providers = pm.queryContentProviders(
null, -1, PackageManager.GET_META_DATA);
for (ProviderInfo info : providers) {
if (info.metaData != null && info.metaData.containsKey(
DocumentsContract.META_DATA_DOCUMENT_PROVIDER)) {
// TODO: populate roots on background thread, and cache results
final Uri rootsUri = DocumentsContract.buildRootsUri(info.authority);
final ContentProviderClient client = resolver
.acquireUnstableContentProviderClient(info.authority);
Cursor cursor = null;
try {
cursor = client.query(rootsUri, null, null, null, null);
while (cursor.moveToNext()) {
final RootInfo root = RootInfo.fromRootsCursor(info.authority, cursor);
mRoots.add(root);
}
} catch (Exception e) {
Log.w(TAG, "Failed to load some roots from " + info.authority + ": " + e);
} finally {
IoUtils.closeQuietly(cursor);
ContentProviderClient.closeQuietly(client);
}
}
}
Log.d(TAG, "Update found " + mRoots.size() + " roots");
}
@Deprecated
public RootInfo findRoot(Uri uri) {
final String authority = uri.getAuthority();
final String docId = DocumentsContract.getDocumentId(uri);
for (RootInfo root : mRoots) {
if (Objects.equal(root.authority, authority) && Objects.equal(root.documentId, docId)) {
return root;
}
}
return null;
}
@GuardedBy("ActivityThread")
public RootInfo getRoot(String authority, String rootId) {
for (RootInfo root : mRoots) {
if (Objects.equal(root.authority, authority) && Objects.equal(root.rootId, rootId)) {
return root;
}
}
return null;
}
@GuardedBy("ActivityThread")
public boolean isIconUnique(RootInfo root) {
final int rootIcon = root.derivedIcon != 0 ? root.derivedIcon : root.icon;
for (RootInfo test : mRoots) {
if (Objects.equal(test.authority, root.authority)) {
if (Objects.equal(test.rootId, root.rootId)) {
continue;
}
final int testIcon = test.derivedIcon != 0 ? test.derivedIcon : test.icon;
if (testIcon == rootIcon) {
return false;
}
}
}
return true;
}
@GuardedBy("ActivityThread")
public RootInfo getRecentsRoot() {
return mRecentsRoot;
}
@GuardedBy("ActivityThread")
public boolean isRecentsRoot(RootInfo root) {
return mRecentsRoot == root;
}
@GuardedBy("ActivityThread")
public List<RootInfo> getRoots() {
return mRoots;
}
@GuardedBy("ActivityThread")
public List<RootInfo> getMatchingRoots(State state) {
return getMatchingRoots(mRoots, state);
}
public static List<RootInfo> getMatchingRoots(List<RootInfo> roots, State state) {
ArrayList<RootInfo> matching = Lists.newArrayList();
for (RootInfo root : roots) {
final boolean supportsCreate = (root.flags & Root.FLAG_SUPPORTS_CREATE) != 0;
final boolean advanced = (root.flags & Root.FLAG_ADVANCED) != 0;
final boolean localOnly = (root.flags & Root.FLAG_LOCAL_ONLY) != 0;
final boolean empty = (root.flags & Root.FLAG_EMPTY) != 0;
// Exclude read-only devices when creating
if (state.action == State.ACTION_CREATE && !supportsCreate) continue;
// Exclude advanced devices when not requested
if (!state.showAdvanced && advanced) continue;
// Exclude non-local devices when local only
if (state.localOnly && !localOnly) continue;
// Only show empty roots when creating
if (state.action != State.ACTION_CREATE && empty) continue;
// Only include roots that serve requested content
final boolean overlap =
MimePredicate.mimeMatches(root.derivedMimeTypes, state.acceptMimes) ||
MimePredicate.mimeMatches(state.acceptMimes, root.derivedMimeTypes);
if (!overlap) {
continue;
}
matching.add(root);
}
return matching;
}
}
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