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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.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.Document;
import com.android.internal.util.Predicate;
import com.google.android.collect.Lists;
import libcore.io.IoUtils;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class DirectoryLoader extends UriDerivativeLoader<List<Document>> {
private final int mType;
private Predicate<Document> mFilter;
private Comparator<Document> mSortOrder;
public DirectoryLoader(Context context, Uri uri, int type, Predicate<Document> filter,
Comparator<Document> sortOrder) {
super(context, uri);
mType = type;
mFilter = filter;
mSortOrder = sortOrder;
}
@Override
public List<Document> loadInBackground(Uri uri, CancellationSignal signal) {
final ArrayList<Document> result = Lists.newArrayList();
// TODO: send selection and sorting hints to backend
final ContentResolver resolver = getContext().getContentResolver();
final Cursor cursor = resolver.query(uri, null, null, null, null, signal);
try {
while (cursor != null && cursor.moveToNext()) {
Document doc = null;
switch (mType) {
case TYPE_NORMAL:
case TYPE_SEARCH:
doc = Document.fromDirectoryCursor(uri, cursor);
break;
case TYPE_RECENT_OPEN:
try {
doc = Document.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.add(doc);
}
}
} finally {
IoUtils.closeQuietly(cursor);
}
if (mSortOrder != null) {
Collections.sort(result, mSortOrder);
}
return result;
}
}
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