| /* |
| * 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.DirectoryFragment.TYPE_NORMAL; |
| import static com.android.documentsui.DirectoryFragment.TYPE_RECENT_OPEN; |
| import static com.android.documentsui.DirectoryFragment.TYPE_SEARCH; |
| import static com.android.documentsui.DocumentsActivity.TAG; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.os.CancellationSignal; |
| import android.util.Log; |
| |
| import com.android.documentsui.model.DocumentInfo; |
| import com.android.internal.util.Predicate; |
| import com.google.android.collect.Lists; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.FileNotFoundException; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| class DirectoryResult implements AutoCloseable { |
| Cursor cursor; |
| List<DocumentInfo> contents = Lists.newArrayList(); |
| Exception e; |
| |
| @Override |
| public void close() throws Exception { |
| IoUtils.closeQuietly(cursor); |
| } |
| } |
| |
| public class DirectoryLoader extends UriDerivativeLoader<Uri, DirectoryResult> { |
| |
| private final int mType; |
| private Predicate<DocumentInfo> mFilter; |
| private Comparator<DocumentInfo> mSortOrder; |
| |
| public DirectoryLoader(Context context, Uri uri, int type, Predicate<DocumentInfo> filter, |
| Comparator<DocumentInfo> sortOrder) { |
| super(context, uri); |
| mType = type; |
| mFilter = filter; |
| mSortOrder = sortOrder; |
| } |
| |
| @Override |
| public DirectoryResult loadInBackground(Uri uri, CancellationSignal signal) { |
| final DirectoryResult result = new DirectoryResult(); |
| try { |
| loadInBackgroundInternal(result, uri, signal); |
| } catch (Exception e) { |
| result.e = e; |
| } |
| return result; |
| } |
| |
| private void loadInBackgroundInternal( |
| DirectoryResult result, Uri uri, CancellationSignal signal) throws RuntimeException { |
| // TODO: switch to using unstable CPC |
| final ContentResolver resolver = getContext().getContentResolver(); |
| final Cursor cursor = resolver.query(uri, null, null, null, null, signal); |
| result.cursor = cursor; |
| result.cursor.registerContentObserver(mObserver); |
| |
| while (cursor.moveToNext()) { |
| DocumentInfo doc = null; |
| switch (mType) { |
| case TYPE_NORMAL: |
| case TYPE_SEARCH: |
| doc = DocumentInfo.fromDirectoryCursor(uri, cursor); |
| break; |
| case TYPE_RECENT_OPEN: |
| try { |
| doc = DocumentInfo.fromRecentOpenCursor(resolver, cursor); |
| } catch (FileNotFoundException e) { |
| Log.w(TAG, "Failed to find recent: " + e); |
| } |
| break; |
| default: |
| throw new IllegalArgumentException("Unknown type"); |
| } |
| |
| if (doc != null && (mFilter == null || mFilter.apply(doc))) { |
| result.contents.add(doc); |
| } |
| } |
| |
| if (mSortOrder != null) { |
| Collections.sort(result.contents, mSortOrder); |
| } |
| } |
| } |