001// Copyright 2004, 2005 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 015package org.apache.tapestry.engine; 016 017import org.apache.tapestry.spec.IComponentSpecification; 018 019/** 020 * A provider of enhanced classes, classes with new methods and new attributes, and possibly, 021 * implementing new Java interfaces. The primary use of class enhancement is to automate the 022 * creation of transient and persistant properties. 023 * <p> 024 * Implementations of this interface must be threadsafe. 025 * 026 * @author Howard Lewis Ship 027 * @since 3.0 028 * @deprecated To be removed in 4.1 029 * @see org.apache.tapestry.services.ComponentConstructorFactory 030 */ 031 032public interface IComponentClassEnhancer 033{ 034 /** 035 * Used to access the class for a given component (or page). Returns the specified class, or an 036 * enhanced version of the class if the component requires enhancement. 037 * 038 * @param specification 039 * the specification for the component 040 * @param className 041 * the name of base class to enhance, as extracted from the specification (or 042 * possibly, from a default). 043 * @throws org.apache.tapestry.ApplicationRuntimeException 044 * if the class does not exist, is invalid, or may not be enhanced. 045 */ 046 047 public Class getEnhancedClass(IComponentSpecification specification, String className); 048}