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eXist-db NoSQL Database Core

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/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2001-04 The eXist Project
 *  http://exist-db.org
 *
 *  This program 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; either version 2
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  $Id$
 */
package org.exist.source;

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

/**
 * A source loaded through the current context class loader.
 *
 * @author wolf
 */
public class ClassLoaderSource extends URLSource {

    public final static String PROTOCOL = "resource:";

    private final String source;

    /**
     * @param source The resource name (e.g. url).
     *
     *  The name of a resource is a '/'-separated path name that
     *  identifies the resource. Preceding "/" and "resource:"" are removed.
     * @throws IOException in case of an I/O error
     */
    public ClassLoaderSource(String source) throws IOException {
        this.source = source;

        if (source.startsWith(PROTOCOL)) {
            source = source.substring(PROTOCOL.length());
        }
        if (source.startsWith("/")) {
            source = source.substring(1);
        }
        final ClassLoader cl = Thread.currentThread().getContextClassLoader();
        final URL url = cl.getResource(source);
        if (url == null) {
            throw new IOException("Source not found: " + source);
        }
        setURL(url);
    }

    @Override
    public String type() {
        final String protocol = url.getProtocol();
        final String host = url.getHost();
        if (protocol.equals("file") && (host == null || host.length() == 0 || "localhost".equals(host) || "127.0.0.1".equals(host))) {
            return "File";
        }
        return "Classloader";
    }

    public String getSource() {
        return source;
    }
}