001// Copyright 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.annotations; 016 017import java.lang.reflect.Method; 018 019import org.apache.hivemind.Location; 020import org.apache.tapestry.enhance.EnhancementOperation; 021import org.apache.tapestry.spec.IComponentSpecification; 022import org.apache.tapestry.spec.IPropertySpecification; 023import org.apache.tapestry.spec.PropertySpecification; 024 025/** 026 * Allow a property to be marked as persistent, and (optionally) allows a strategy to be set. Works 027 * by adding a new {@link org.apache.tapestry.spec.IPropertySpecification} to the 028 * {@link org.apache.tapestry.spec.IComponentSpecification}. 029 * <p> 030 * The {@link org.apache.tapestry.annotations.Persist} annotation may <em>optionally</em> by 031 * accompanied by a {@link org.apache.tapestry.annotations.InitialValue} annotation; this sets the 032 * initial value, as a binding reference, used to initialize and re-initialize the property. 033 * 034 * @author Howard M. Lewis Ship 035 * @since 4.0 036 * @see org.apache.tapestry.annotations.Persist 037 */ 038public class PersistAnnotationWorker implements MethodAnnotationEnhancementWorker 039{ 040 public void performEnhancement(EnhancementOperation op, IComponentSpecification spec, 041 Method method, Location location) 042 { 043 Persist p = method.getAnnotation(Persist.class); 044 InitialValue iv = method.getAnnotation(InitialValue.class); 045 046 String propertyName = AnnotationUtils.getPropertyName(method); 047 String stategy = p.value(); 048 049 IPropertySpecification pspec = new PropertySpecification(); 050 051 pspec.setName(propertyName); 052 pspec.setPersistence(stategy); 053 pspec.setLocation(location); 054 pspec.setInitialValue(iv == null ? null : iv.value()); 055 056 spec.addPropertySpecification(pspec); 057 } 058 059}