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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.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ProviderInfo;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.provider.DocumentsContract;
import android.provider.DocumentsContract.DocumentRoot;
import android.provider.DocumentsContract.Documents;
import android.util.Log;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.util.Objects;
import com.google.android.collect.Lists;
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 final Context mContext;
public List<DocumentRoot> mRoots = Lists.newArrayList();
private DocumentRoot mRecentsRoot;
public RootsCache(Context context) {
mContext = context;
update();
}
/**
* Gather roots from all known storage providers.
*/
@GuardedBy("ActivityThread")
public void update() {
mRoots.clear();
{
// Create special root for recents
final DocumentRoot root = new DocumentRoot();
root.rootType = DocumentRoot.ROOT_TYPE_SHORTCUT;
root.docId = null;
root.icon = R.drawable.ic_dir;
root.title = mContext.getString(R.string.root_recent);
root.summary = null;
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: remove deprecated customRoots flag
// TODO: populate roots on background thread, and cache results
final ContentProviderClient client = resolver
.acquireUnstableContentProviderClient(info.authority);
try {
final List<DocumentRoot> roots = DocumentsContract.getDocumentRoots(client);
for (DocumentRoot root : roots) {
root.authority = info.authority;
}
mRoots.addAll(roots);
} catch (Exception e) {
Log.w(TAG, "Failed to load some roots from " + info.authority + ": " + e);
} finally {
ContentProviderClient.closeQuietly(client);
}
}
}
}
public DocumentRoot findRoot(Uri uri) {
final String authority = uri.getAuthority();
final String docId = DocumentsContract.getDocId(uri);
for (DocumentRoot root : mRoots) {
if (Objects.equal(root.authority, authority) && Objects.equal(root.docId, docId)) {
return root;
}
}
return null;
}
@GuardedBy("ActivityThread")
public DocumentRoot getRecentsRoot() {
return mRecentsRoot;
}
@GuardedBy("ActivityThread")
public boolean isRecentsRoot(DocumentRoot root) {
return mRecentsRoot == root;
}
@GuardedBy("ActivityThread")
public List<DocumentRoot> getRoots() {
return mRoots;
}
@GuardedBy("ActivityThread")
public static Drawable resolveDocumentIcon(Context context, String mimeType) {
if (Documents.MIME_TYPE_DIR.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;
}
}
}
}
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