/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.camera.data;
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import android.content.ContentResolver;
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import android.database.Cursor;
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import android.net.Uri;
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import android.provider.MediaStore;
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import com.android.camera.Storage;
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import com.android.camera.debug.Log;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* A set of queries for loading data from a content resolver.
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*/
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public class FilmstripContentQueries {
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private static final Log.Tag TAG = new Log.Tag("LocalDataQuery");
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private static final String CAMERA_PATH = Storage.DIRECTORY + "%";
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private static final String SELECT_BY_PATH = MediaStore.MediaColumns.DATA + " LIKE ?";
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public interface CursorToFilmstripItemFactory<I extends FilmstripItem> {
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/**
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* Convert a cursor at a given location to a Local Data object.
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*
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* @param cursor the current cursor state.
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* @return a LocalData object that represents the current cursor state.
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*/
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public I get(Cursor cursor);
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}
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/**
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* Query the camera storage directory and convert it to local data
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* objects.
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*
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* @param contentResolver to resolve content with.
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* @param contentUri to resolve an item at
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* @param projection the columns to extract
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* @param minimumId the lower bound of results
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* @param orderBy the order by clause
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* @param factory an object that can turn a given cursor into a LocalData object.
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* @return A list of LocalData objects that satisfy the query.
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*/
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public static <I extends FilmstripItem> List<I> forCameraPath(ContentResolver contentResolver,
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Uri contentUri, String[] projection, long minimumId, String orderBy,
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CursorToFilmstripItemFactory<I> factory) {
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String selection = SELECT_BY_PATH + " AND " + MediaStore.MediaColumns._ID + " > ?";
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String[] selectionArgs = new String[] { CAMERA_PATH, Long.toString(minimumId) };
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Cursor cursor = contentResolver.query(contentUri, projection,
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selection, selectionArgs, orderBy);
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List<I> result = new ArrayList<>();
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if (cursor != null) {
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while (cursor.moveToNext()) {
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I item = factory.get(cursor);
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if (item != null) {
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result.add(item);
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} else {
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final int dataIndex = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
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Log.e(TAG, "Error loading data:" + cursor.getString(dataIndex));
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}
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}
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cursor.close();
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}
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return result;
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}
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}
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