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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.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.provider.DocumentsContract.Documents;
import android.util.Log;
import android.util.Pair;
import com.android.documentsui.model.Document;
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 sRecentsRoot;
/**
* 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.buildRecents(context);
sRootsList.add(root);
sRecentsRoot = 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);
try {
// 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();
}
} catch (Exception e) {
Log.w(TAG, "Failed to load some roots from " + info.providerInfo.authority
+ ": " + e);
}
}
}
}
@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 findRoot(Context context, Document doc) {
final String authority = doc.uri.getAuthority();
final String rootId = DocumentsContract.getRootId(doc.uri);
return findRoot(context, authority, rootId);
}
@GuardedBy("ActivityThread")
public static Root getRecentsRoot(Context context) {
ensureCache(context);
return sRecentsRoot;
}
@GuardedBy("ActivityThread")
public static Collection<Root> getRoots(Context context) {
ensureCache(context);
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 (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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