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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.camera.data;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import com.android.camera.Storage;
import com.android.camera.debug.Log;
import java.util.ArrayList;
import java.util.List;
/**
* A set of queries for loading data from a content resolver.
*/
public class FilmstripContentQueries {
private static final Log.Tag TAG = new Log.Tag("LocalDataQuery");
private static final String CAMERA_PATH = Storage.DIRECTORY + "%";
private static final String SELECT_BY_PATH = MediaStore.MediaColumns.DATA + " LIKE ?";
public interface CursorToFilmstripItemFactory<I extends FilmstripItem> {
/**
* Convert a cursor at a given location to a Local Data object.
*
* @param cursor the current cursor state.
* @return a LocalData object that represents the current cursor state.
*/
public I get(Cursor cursor);
}
/**
* Query the camera storage directory and convert it to local data
* objects.
*
* @param contentResolver to resolve content with.
* @param contentUri to resolve an item at
* @param projection the columns to extract
* @param minimumId the lower bound of results
* @param orderBy the order by clause
* @param factory an object that can turn a given cursor into a LocalData object.
* @return A list of LocalData objects that satisfy the query.
*/
public static <I extends FilmstripItem> List<I> forCameraPath(ContentResolver contentResolver,
Uri contentUri, String[] projection, long minimumId, String orderBy,
CursorToFilmstripItemFactory<I> factory) {
String selection = SELECT_BY_PATH + " AND " + MediaStore.MediaColumns._ID + " > ?";
String[] selectionArgs = new String[] { CAMERA_PATH, Long.toString(minimumId) };
Cursor cursor = contentResolver.query(contentUri, projection,
selection, selectionArgs, orderBy);
List<I> result = new ArrayList<>();
if (cursor != null) {
while (cursor.moveToNext()) {
I item = factory.get(cursor);
if (item != null) {
result.add(item);
} else {
final int dataIndex = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
Log.e(TAG, "Error loading data:" + cursor.getString(dataIndex));
}
}
cursor.close();
}
return result;
}
}
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