/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.web;

import javax.servlet.ServletRequest;


/**
 * A <code>PortResolver</code> determines the port a web request was received
 * on.
 *
 * <P>
 * This interface is necessary because
 * <code>ServletRequest.getServerPort()</code> may not return the correct port
 * in certain circumstances. For example, if the browser does not construct
 * the URL correctly after a redirect.
 * </p>
 *
 * @author Ben Alex
 */
public interface PortResolver {
    //~ Methods ========================================================================================================

    /**
     * Indicates the port the <code>ServletRequest</code> was received on.
     *
     * @param request that the method should lookup the port for
     *
     * @return the port the request was received on
     */
    int getServerPort(ServletRequest request);
}
