de.dan_nrw.android.scroid.dao.wallpapers.WallpaperDAO.java Source code

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Here is the source code for de.dan_nrw.android.scroid.dao.wallpapers.WallpaperDAO.java

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/* 
 * Android Scroid - Screen Android
 * 
 * Copyright (C) 2009  Daniel Czerwonk <d.czerwonk@googlemail.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, or
 * (at your option) any later version.
 * 
 * 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 de.dan_nrw.android.scroid.dao.wallpapers;

import java.io.IOException;
import java.net.URI;
import java.text.ParseException;
import java.util.List;

import org.apache.http.HttpRequest;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;

import com.google.inject.Inject;

import android.content.Context;
import android.graphics.Bitmap;

import de.dan_nrw.android.scroid.R;
import de.dan_nrw.android.scroid.Wallpaper;
import de.dan_nrw.android.scroid.dao.wallpapers.parsing.IWallpaperParser;
import de.dan_nrw.android.util.net.BitmapHttpResponseHandler;
import de.dan_nrw.android.util.net.TextFileHttpResponseHandler;

/**
 * @author Daniel Czerwonk
 *
 */
public final class WallpaperDAO implements IWallpaperDAO {

    private final IWallpaperParser wallpaperParser;

    private static final int MAX_DOWNLOAD_RETRIES = 10;

    /**
     * Creates a new instance of WallpaperDAO.
     */
    @Inject
    WallpaperDAO(IWallpaperParser wallpaperParser) {
        super();

        this.wallpaperParser = wallpaperParser;
    }

    /* (non-Javadoc)
     * @see de.dan_nrw.android.scroid.dao.wallpapers.IWallpaperDAO#getAvailableWallpapers(android.content.Context)
     */
    public Wallpaper[] getAvailableWallpapers(Context context) throws WallpaperListReceivingException {
        try {
            String data = this.download(URI.create(context.getString(R.string.galleryUrl)),
                    new TextFileHttpResponseHandler(), MAX_DOWNLOAD_RETRIES);

            List<Wallpaper> wallpapers = this.wallpaperParser.parse(data);

            return wallpapers.toArray(new Wallpaper[wallpapers.size()]);
        } catch (IllegalStateException ex) {
            throw new WallpaperListReceivingException(context.getString(R.string.receivingException), ex);
        } catch (IOException ex) {
            throw new WallpaperListReceivingException(context.getString(R.string.receivingException), ex);
        } catch (ParseException ex) {
            throw new WallpaperListReceivingException(context.getString(R.string.parseExceptionText), ex);
        }
    }

    /* (non-Javadoc)
      * @see de.dan_nrw.boobleftboobright.IWallpaperManager#downloadImage(java.net.URI)
      */
    @Override
    public Bitmap downloadImage(URI uri) throws ClientProtocolException, IOException {
        return this.download(uri, new BitmapHttpResponseHandler(), MAX_DOWNLOAD_RETRIES);
    }

    /**
     * Downlaods a file
     * @param <T> Type of return
     * @param uri URI of file to download
     * @param responseHandler Response handler parsing the response
     * @param maxRetries Max count of retries before exception
     * @return Parsed object based on download data
     * @throws ClientProtocolException
     * @throws IOException
     */
    private <T> T download(URI uri, ResponseHandler<T> responseHandler, int maxRetries)
            throws ClientProtocolException, IOException {
        try {
            DefaultHttpClient client = new DefaultHttpClient();
            client.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(maxRetries, false));

            HttpRequest request = new HttpGet(uri);

            return client.execute((HttpUriRequest) request, responseHandler);
        } catch (IOException ex) {
            throw ex;
        }
    }
}