new3d/src/com/android/gallery3d/data/LocalAlbum.java

/*
 * Copyright (C) 2010 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.gallery3d.data;

import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Video;
import android.provider.MediaStore.Images.ImageColumns;
import android.provider.MediaStore.Video.VideoColumns;

import com.android.gallery3d.app.GalleryContext;
import com.android.gallery3d.util.Utils;

import java.util.ArrayList;
import java.util.Comparator;

// LocalAlbumSet lists all media items in one bucket on local storage.
// The media items need to be all images or all videos, but not both.
public class LocalAlbum extends MediaSet {
    private static final String TAG = "LocalAlbum";
    private static final String[] COUNT_PROJECTION = { "count(*)" };
    private final String mWhereClause;
    private final String mOrderClause;
    private final Uri mBaseUri;
    private final String[] mProjection;
    public static final Comparator<LocalAlbum> sBucketNameComparator =
            new BucketNameComparator();
    public static final Comparator<MediaItem> sDateTakenComparator =
            new DateTakenComparator();

    private final GalleryContext mContext;
    private final ContentResolver mResolver;
    private final int mBucketId;
    private final String mBucketName;
    private boolean mIsImage;
    private long mUniqueId;

    public LocalAlbum(GalleryContext context, int bucketId, String name, boolean isImage) {
        mContext = context;
        mResolver = context.getContentResolver();
        mBucketId = bucketId;
        mBucketName = name;
        mIsImage = isImage;

        if (isImage) {
            mWhereClause = ImageColumns.BUCKET_ID + "=?";
            mOrderClause = ImageColumns.DATE_TAKEN + " DESC, "
                    + ImageColumns._ID + " ASC";
            mBaseUri = Images.Media.EXTERNAL_CONTENT_URI;
            mProjection = LocalImage.PROJECTION;
            mUniqueId = DataManager.makeId(
                    DataManager.ID_LOCAL_IMAGE_ALBUM, bucketId);
        } else {
            mWhereClause = VideoColumns.BUCKET_ID + "=?";
            mOrderClause = VideoColumns.DATE_TAKEN + " DESC, "
                    + VideoColumns._ID + " ASC";
            mBaseUri = Video.Media.EXTERNAL_CONTENT_URI;
            mProjection = LocalVideo.PROJECTION;
            mUniqueId = DataManager.makeId(
                    DataManager.ID_LOCAL_VIDEO_ALBUM, bucketId);
        }
    }

    public long getUniqueId() {
        return mUniqueId;
    }

    public ArrayList<MediaItem> getMediaItem(int start, int count) {
        ImageService imageService = mContext.getImageService();
        DataManager dataManager = mContext.getDataManager();

        Uri uri = mBaseUri.buildUpon()
                .appendQueryParameter("limit", start + "," + count).build();
        ArrayList<MediaItem> list = new ArrayList<MediaItem>();
        Cursor cursor = mResolver.query(
                uri, mProjection, mWhereClause,
                new String[]{String.valueOf(mBucketId)},
                mOrderClause);

        try {
            while (cursor.moveToNext()) {
                if (mIsImage) {
                    list.add(LocalImage.load(imageService, cursor, dataManager));
                } else {
                    list.add(LocalVideo.load(imageService, cursor, dataManager));
                }
            }
        } finally {
            cursor.close();
        }
        return list;
    }

    public int getMediaItemCount() {
        Cursor cursor = mResolver.query(
                mBaseUri, COUNT_PROJECTION, mWhereClause,
                new String[]{String.valueOf(mBucketId)}, null);
        try {
            Utils.Assert(cursor.moveToNext());
            return cursor.getInt(0);
        } finally {
            cursor.close();
        }
    }

    public String getName() {
        return mBucketName;
    }

    public int getTotalMediaItemCount() {
        return getMediaItemCount();
    }

    private static class BucketNameComparator implements Comparator<LocalAlbum> {
        public int compare(LocalAlbum s1, LocalAlbum s2) {
            int result = s1.mBucketName.compareTo(s2.mBucketName);
            if (result != 0) return result;
            if (s1.mBucketId > s2.mBucketId) {
                return 1;
            } else if (s1.mBucketId < s2.mBucketId) {
                return -1;
            } else {
                return 0;
            }
        }
    }

    private static class DateTakenComparator implements Comparator<MediaItem> {
        public int compare(MediaItem item1, MediaItem item2) {
            LocalMediaItem s1 = (LocalMediaItem) item1;
            LocalMediaItem s2 = (LocalMediaItem) item2;
            if (s1.mDateTakenInMs > s2.mDateTakenInMs) {
                return -1;
            } else if (s1.mDateTakenInMs < s2.mDateTakenInMs) {
                return 1;
            } else {
                return 0;
            }
        }
    }

    public void reload() {
        // do nothing
    }

    @Override
    public int getSupportedOperations() {
        return 0;
    }

    @Override
    public boolean supportOpeation(int operation) {
        return false;
    }

    @Override
    public void delete() {
    }
}