/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

package java.net;

import java.security.AccessController;

/**

 * This class defines a factory for creating DatagramSocketImpls. It defaults

 * to creating plain DatagramSocketImpls, but may create other DatagramSocketImpls

 * by setting the impl.prefix system property.

 *

 * @author Chris Hegarty

 */

class DefaultDatagramSocketImplFactory {

    static {

        String prefix = null;

        try {

            prefix = AccessController.doPrivileged(

                new sun.security.action.GetPropertyAction("impl.prefix", null));

            if (prefix != null)

                prefixImplClass = Class.forName("java.net."+prefix+"DatagramSocketImpl");

        } catch (Exception e) {

            System.err.println("Can't find class: java.net." +

                                prefix +

                                "DatagramSocketImpl: check impl.prefix property");

            //prefixImplClass = null;

        }

    }

    /**

     * Creates a new <code>DatagramSocketImpl</code> instance.

     *

     * @param   isMulticast     true if this impl if for a MutlicastSocket

     * @return  a new instance of a <code>DatagramSocketImpl</code>.

     */

    static DatagramSocketImpl createDatagramSocketImpl(boolean isMulticast /*unused on unix*/)

        throws SocketException {

        if (prefixImplClass != null) {

            try {

                return (DatagramSocketImpl)prefixImplClass.newInstance();

            } catch (Exception e) {

                throw new SocketException("can't instantiate DatagramSocketImpl");

            }

        } else {

            return new java.net.PlainDatagramSocketImpl();

        }

    }

}