    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    }