FilterSource.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.fastergallery.data;

import com.android.fastergallery.app.GalleryApp;

public class FilterSource extends MediaSource {
	@SuppressWarnings("unused")
	private static final String TAG = "FilterSource";
	private static final int FILTER_BY_MEDIATYPE = 0;
	private static final int FILTER_BY_DELETE = 1;
	private static final int FILTER_BY_EMPTY = 2;
	private static final int FILTER_BY_EMPTY_ITEM = 3;
	private static final int FILTER_BY_CAMERA_SHORTCUT = 4;
	private static final int FILTER_BY_CAMERA_SHORTCUT_ITEM = 5;

	public static final String FILTER_EMPTY_ITEM = "/filter/empty_prompt";
	public static final String FILTER_CAMERA_SHORTCUT = "/filter/camera_shortcut";
	private static final String FILTER_CAMERA_SHORTCUT_ITEM = "/filter/camera_shortcut_item";

	private GalleryApp mApplication;
	private PathMatcher mMatcher;
	private MediaItem mEmptyItem;
	private MediaItem mCameraShortcutItem;

	public FilterSource(GalleryApp application) {
		super("filter");
		mApplication = application;
		mMatcher = new PathMatcher();
		mMatcher.add("/filter/mediatype/*/*", FILTER_BY_MEDIATYPE);
		mMatcher.add("/filter/delete/*", FILTER_BY_DELETE);
		mMatcher.add("/filter/empty/*", FILTER_BY_EMPTY);
		mMatcher.add(FILTER_EMPTY_ITEM, FILTER_BY_EMPTY_ITEM);
		mMatcher.add(FILTER_CAMERA_SHORTCUT, FILTER_BY_CAMERA_SHORTCUT);
		mMatcher.add(FILTER_CAMERA_SHORTCUT_ITEM,
				FILTER_BY_CAMERA_SHORTCUT_ITEM);

		mEmptyItem = new EmptyAlbumImage(Path.fromString(FILTER_EMPTY_ITEM),
				mApplication);
		mCameraShortcutItem = new CameraShortcutImage(
				Path.fromString(FILTER_CAMERA_SHORTCUT_ITEM), mApplication);
	}

	// The name we accept are:
	// /filter/mediatype/k/{set} where k is the media type we want.
	// /filter/delete/{set}
	@Override
	public MediaObject createMediaObject(Path path) {
		int matchType = mMatcher.match(path);
		DataManager dataManager = mApplication.getDataManager();
		switch (matchType) {
		case FILTER_BY_MEDIATYPE: {
			int mediaType = mMatcher.getIntVar(0);
			String setsName = mMatcher.getVar(1);
			MediaSet[] sets = dataManager.getMediaSetsFromString(setsName);
			return new FilterTypeSet(path, dataManager, sets[0], mediaType);
		}
		case FILTER_BY_DELETE: {
			String setsName = mMatcher.getVar(0);
			MediaSet[] sets = dataManager.getMediaSetsFromString(setsName);
			return new FilterDeleteSet(path, sets[0]);
		}
		case FILTER_BY_EMPTY: {
			String setsName = mMatcher.getVar(0);
			MediaSet[] sets = dataManager.getMediaSetsFromString(setsName);
			return new FilterEmptyPromptSet(path, sets[0], mEmptyItem);
		}
		case FILTER_BY_EMPTY_ITEM: {
			return mEmptyItem;
		}
		case FILTER_BY_CAMERA_SHORTCUT: {
			return new SingleItemAlbum(path, mCameraShortcutItem);
		}
		case FILTER_BY_CAMERA_SHORTCUT_ITEM: {
			return mCameraShortcutItem;
		}
		default:
			throw new RuntimeException("bad path: " + path);
		}
	}
}