/*
 * Copyright (c) 2007-2011 by The Broad Institute of MIT and Harvard.  All Rights Reserved.
 *
 * This software is licensed under the terms of the GNU Lesser General Public License (LGPL),
 * Version 2.1 which is available at http://www.opensource.org/licenses/lgpl-2.1.php.
 *
 * THE SOFTWARE IS PROVIDED "AS IS." THE BROAD AND MIT MAKE NO REPRESENTATIONS OR
 * WARRANTES OF ANY KIND CONCERNING THE SOFTWARE, EXPRESS OR IMPLIED, INCLUDING,
 * WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, NONINFRINGEMENT, OR THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER
 * OR NOT DISCOVERABLE.  IN NO EVENT SHALL THE BROAD OR MIT, OR THEIR RESPECTIVE
 * TRUSTEES, DIRECTORS, OFFICERS, EMPLOYEES, AND AFFILIATES BE LIABLE FOR ANY DAMAGES
 * OF ANY KIND, INCLUDING, WITHOUT LIMITATION, INCIDENTAL OR CONSEQUENTIAL DAMAGES,
 * ECONOMIC DAMAGES OR INJURY TO PROPERTY AND LOST PROFITS, REGARDLESS OF WHETHER
 * THE BROAD OR MIT SHALL BE ADVISED, SHALL HAVE OTHER REASON TO KNOW, OR IN FACT
 * SHALL KNOW OF THE POSSIBILITY OF THE FOREGOING.
 */

package org.broad.igv.util.stream;

import org.broad.igv.util.HttpUtils;
import org.broad.tribble.util.URLHelper;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * @author jrobinso
 * @date Jul 6, 2011
 */
public class IGVUrlHelper implements URLHelper {

    URL url;

    public IGVUrlHelper(URL url) {
        this.url = url;
    }

    public URL getUrl() {
        return url;
    }

    public long getContentLength() throws IOException {
        return HttpUtils.getInstance().getContentLength(url);
    }

    public InputStream openInputStreamForRange(long start, long end) throws IOException {

        String byteRange = "bytes=" + start + "-" + end;
        Map<String, String> params = new HashMap();
        params.put("Range", byteRange);
        return HttpUtils.getInstance().openConnectionStream(url, params);
    }

    public boolean exists() {
        return HttpUtils.getInstance().resourceAvailable(url);
    }
}
