001 // Copyright 2007, 2011 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 org.apache.tapestry5.MarkupWriter; 018 019 /** 020 * Filter interface for {@link org.apache.tapestry5.services.MarkupRenderer}, which allows for code to execute before 021 * and/or after the main rendering process. Typically, this is to allow for the placement of 022 * {@linkplain org.apache.tapestry5.services.Environment environmental services}. 023 * 024 * @see org.apache.tapestry5.services.TapestryModule#contributeMarkupRenderer 025 */ 026 public interface MarkupRendererFilter 027 { 028 /** 029 * Implementations should perform work before or after passing the writer to the renderer. 030 * 031 * @param writer 032 * to which markup should be written 033 * @param renderer 034 * delegate to which the writer should be passed. 035 */ 036 void renderMarkup(MarkupWriter writer, MarkupRenderer renderer); 037 }