    001    // Copyright 2006 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    //     http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.services;
    016
    017    import javax.servlet.http.HttpServletRequest;
    018    import javax.servlet.http.HttpServletResponse;
    019    import java.io.IOException;
    020
    021    /**
    022     * Filter interface for {@link org.apache.tapestry5.services.HttpServletRequestHandler}.
    023     */
    024    public interface HttpServletRequestFilter
    025    {
    026        /**
    027         * Filter interface for the HttpServletRequestHandler pipeline. A filter should delegate to the handler. It may
    028         * perform operations before or after invoking the handler, and may modify the request and response passed in to the
    029         * handler.
    030         *
    031         * @return true if the request has been handled, false otherwise
    032         */
    033        boolean service(HttpServletRequest request, HttpServletResponse response, HttpServletRequestHandler handler)
    034                throws IOException;
    035    }