URLDownloader

package crawler;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

public class URLDownloader implements Downloader {

    private Downloader downloader;

    public URLDownloader(Downloader downloader) {
        this.downloader = downloader;
    }

    @Override
    public InputStream download(String url) throws IOException {
        try {
            return this.downloader.download(url);
        } catch (IOException ioe) {
            return new URL(url).openStream();
        }
    }
}