/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2005-2008, Open Source Geospatial Foundation (OSGeo)
 *    
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.styling;

import java.net.MalformedURLException;
import java.net.URL;

/**
 * Default locator for online resources. Searches by absolute URL, relative
 * path w.r.t. to SLD document or classpath.
 * 
 * @author Jan De Moerloose
 * 
 */
public class DefaultResourceLocator implements ResourceLocator {

    URL sourceUrl;

    private static final java.util.logging.Logger LOGGER = org.geotools.util.logging.Logging
        .getLogger("org.geotools.styling");

    public void setSourceUrl(URL sourceUrl) {
        this.sourceUrl = sourceUrl;
    }
    
    public URL locateResource(String uri) {
        URL url = null;
        try {
            url = new URL(uri);
        } catch (MalformedURLException mfe) {
            LOGGER.fine("Looks like " + uri + " is a relative path..");
            if (sourceUrl != null) {
                try {
                    url = new URL(sourceUrl, uri);
                } catch (MalformedURLException e) {
                    LOGGER.warning("can't parse " + uri + " as relative to"
                            + sourceUrl.toExternalForm());
                }
            }
            if (url == null)
            {
                url = getClass().getResource(uri);
                if (url == null)
                        LOGGER.warning("can't parse " + uri + " as a java resource present in the classpath");
            }
        }
        return url;
    }
}