BusStationService.java

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package fr.gotorennes.remote;

import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import fr.gotorennes.domain.Ligne;
import fr.gotorennes.persistence.BusDao;

public class BusStationService {

	private Map<Long, Bitmap> iconCache = new ConcurrentHashMap<Long, Bitmap>();
	private Map<Long, String> urlCache = new ConcurrentHashMap<Long, String>();

	private static BusStationService instance;

	private BusStationService(Context context) {
		BusDao busDao = BusDao.getInstance(context, null);
		for (Ligne ligne : busDao.getLignes()) {
			urlCache.put(ligne.id, "bus/" + ligne.longCode + ".png");
		}
	}

	public static synchronized BusStationService getInstance(Context context) {
		if (instance == null) {
			instance = new BusStationService(context);
		}
		return instance;
	}

	public Bitmap getBitmapIcon(Context context, long idLigne) {

		if (iconCache.containsKey(idLigne)) {
			return iconCache.get(idLigne);
		}

		try {
			InputStream is = context.getAssets().open(urlCache.get(idLigne));
			Bitmap bitmap = BitmapFactory.decodeStream(is);
			if (bitmap != null) {
				iconCache.put(idLigne, bitmap);
			}
			return bitmap;
		} catch (IOException e) {
			Log.e("GoToRennes", "Erreur de chargement de l'icon", e);
		}

		return null;
	}
}