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    
015    package org.apache.tapestry.annotations;
016    
017    import java.lang.reflect.Method;
018    
019    import org.apache.hivemind.HiveMind;
020    import org.apache.hivemind.Location;
021    import org.apache.tapestry.bean.LightweightBeanInitializer;
022    import org.apache.tapestry.enhance.EnhancementOperation;
023    import org.apache.tapestry.spec.BeanSpecification;
024    import org.apache.tapestry.spec.IBeanSpecification;
025    import org.apache.tapestry.spec.IComponentSpecification;
026    
027    /**
028     * Creates a {@link org.apache.tapestry.spec.IBeanSpecification} from the
029     * {@link org.apache.tapestry.annotations.Bean} annotation.
030     * 
031     * @author Howard M. Lewis Ship
032     * @since 4.0
033     */
034    public class BeanAnnotationWorker implements MethodAnnotationEnhancementWorker
035    {
036        public void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
037                Method method, Location location)
038        {
039            Bean bean = method.getAnnotation(Bean.class);
040            String propertyName = AnnotationUtils.getPropertyName(method);
041    
042            Class beanClass = bean.value();
043            if (beanClass.equals(Object.class))
044                beanClass = op.getPropertyType(propertyName);
045    
046            IBeanSpecification bs = new BeanSpecification();
047    
048            // A shame to convert it to a string then back to
049            // a class later, but ...
050    
051            bs.setClassName(beanClass.getName());
052            bs.setPropertyName(propertyName);
053            bs.setLocation(location);
054    
055            // Starting to like enums!
056    
057            bs.setLifecycle(bean.lifecycle().getBeanLifecycle());
058    
059            String initializer = bean.initializer();
060    
061            if (HiveMind.isNonBlank(initializer))
062                bs.addInitializer(new LightweightBeanInitializer(initializer));
063    
064            spec.addBeanSpecification(propertyName, bs);
065        }
066    
067    }