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    }