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.enhance.EnhancementOperation;
022    import org.apache.tapestry.spec.IComponentSpecification;
023    import org.apache.tapestry.spec.IParameterSpecification;
024    import org.apache.tapestry.spec.ParameterSpecification;
025    
026    /**
027     * Generates a {@link org.apache.tapestry.spec.IParameterSpecification} from a
028     * {@link org.apache.tapestry.annotations.Parameter} annotation and adds it to the
029     * {@link org.apache.tapestry.spec.IComponentSpecification}.
030     * 
031     * @author Howard M. Lewis Ship
032     * @since 4.0
033     */
034    public class ParameterAnnotationWorker implements MethodAnnotationEnhancementWorker
035    {
036    
037        public void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
038                Method method, Location location)
039        {
040            Parameter parameter = method.getAnnotation(Parameter.class);
041    
042            String propertyName = AnnotationUtils.getPropertyName(method);
043    
044            boolean deprecated = method.isAnnotationPresent(Deprecated.class);
045    
046            IParameterSpecification ps = new ParameterSpecification();
047    
048            String parameterName = parameter.name();
049    
050            if (HiveMind.isBlank(parameterName))
051                parameterName = propertyName;
052    
053            Class propertyType = op.getPropertyType(propertyName);
054    
055            ps.setAliases(parameter.aliases());
056            ps.setCache(parameter.cache());
057    
058            if (HiveMind.isNonBlank(parameter.defaultValue()))
059                ps.setDefaultValue(parameter.defaultValue());
060    
061            ps.setDeprecated(deprecated);
062            ps.setParameterName(parameterName);
063            ps.setPropertyName(propertyName);
064            ps.setRequired(parameter.required());
065            ps.setType(propertyType.getName());
066            ps.setLocation(location);
067    
068            spec.addParameter(ps);
069        }
070    }