001    // Copyright 2008, 2010, 2011 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.tapestry5.internal.transform;
016    
017    import org.apache.tapestry5.annotations.Property;
018    import org.apache.tapestry5.model.MutableComponentModel;
019    import org.apache.tapestry5.plastic.PlasticClass;
020    import org.apache.tapestry5.plastic.PlasticField;
021    import org.apache.tapestry5.plastic.PropertyAccessType;
022    import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
023    import org.apache.tapestry5.services.transform.TransformationSupport;
024    
025    /**
026     * Provides the getter and setter methods. The methods are added as "existing", meaning that field access to them will
027     * be transformed as necessary by other annotations. This worker needs to be scheduled before any worker that might
028     * delete a field.
029     * 
030     * @see org.apache.tapestry5.annotations.Property
031     */
032    public class PropertyWorker implements ComponentClassTransformWorker2
033    {
034    
035        public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
036        {
037            for (PlasticField field : plasticClass.getFieldsWithAnnotation(Property.class))
038            {
039                createAccessorsForField(field);
040            }
041        }
042    
043        private void createAccessorsForField(PlasticField field)
044        {
045            PropertyAccessType accessType = toType(field);
046    
047            field.createAccessors(accessType);
048        }
049    
050        private PropertyAccessType toType(PlasticField field)
051        {
052            Property annotation = field.getAnnotation(Property.class);
053    
054            boolean read = annotation.read();
055            boolean write = annotation.write();
056    
057            if (read && write)
058                return PropertyAccessType.READ_WRITE;
059    
060            if (read)
061                return PropertyAccessType.READ_ONLY;
062    
063            if (write)
064                return PropertyAccessType.WRITE_ONLY;
065    
066            throw new IllegalArgumentException(String.format(
067                    "@Property annotation on %s.%s should have either read() or write() enabled.", field.getPlasticClass()
068                            .getClassName(), field.getName()));
069        }
070    }