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.ApplicationRuntimeException;
020    import org.apache.hivemind.Location;
021    import org.apache.tapestry.enhance.EnhancementOperation;
022    import org.apache.tapestry.spec.BindingSpecification;
023    import org.apache.tapestry.spec.BindingType;
024    import org.apache.tapestry.spec.ContainedComponent;
025    import org.apache.tapestry.spec.IBindingSpecification;
026    import org.apache.tapestry.spec.IComponentSpecification;
027    import org.apache.tapestry.spec.IContainedComponent;
028    
029    /**
030     * Adds a {@link org.apache.tapestry.spec.IContainedComponent} to the
031     * {@link org.apache.tapestry.spec.IComponentSpecification}.
032     * 
033     * @author Howard Lewis Ship
034     * @since 4.0
035     * @see org.apache.tapestry.annotations.Component
036     * @see org.apache.tapestry.annotations.Binding
037     */
038    public class ComponentAnnotationWorker implements MethodAnnotationEnhancementWorker
039    {
040    
041        public void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
042                Method method, Location location)
043        {
044            Component component = method.getAnnotation(Component.class);
045    
046            String propertyName = AnnotationUtils.getPropertyName(method);
047            String type = component.type();
048            if (type.equals(""))
049            {
050                Class retTypeClazz = method.getReturnType();
051                type = retTypeClazz.getSimpleName();
052            }
053    
054            IContainedComponent cc = new ContainedComponent();
055    
056            cc.setInheritInformalParameters(component.inheritInformalParameters());
057            cc.setType(type);
058            cc.setPropertyName(propertyName);
059            cc.setLocation(location);
060    
061            for (String binding : component.bindings())
062            {
063                addBinding(cc, binding, location);
064            }
065    
066            String id = component.id();
067    
068            if (id.equals(""))
069                id = propertyName;
070    
071            spec.addComponent(id, cc);
072        }
073    
074        void addBinding(IContainedComponent component, String binding, Location location)
075        {
076            int equalsx = binding.indexOf('=');
077    
078            if (equalsx < 1)
079                invalidBinding(binding);
080    
081            if (equalsx + 1 >= binding.length())
082                invalidBinding(binding);
083    
084            String name = binding.substring(0, equalsx).trim();
085            String value = binding.substring(equalsx + 1).trim();
086    
087            IBindingSpecification bs = new BindingSpecification();
088            bs.setType(BindingType.PREFIXED);
089            bs.setValue(value);
090            bs.setLocation(location);
091    
092            component.setBinding(name, bs);
093        }
094    
095        private void invalidBinding(String binding)
096        {
097            throw new ApplicationRuntimeException(AnnotationMessages.bindingWrongFormat(binding));
098        }
099    }