    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
    015package org.apache.tapestry5.internal.transform;
    016
    017import org.apache.tapestry5.annotations.Property;
    018import org.apache.tapestry5.model.MutableComponentModel;
    019import org.apache.tapestry5.plastic.PlasticClass;
    020import org.apache.tapestry5.plastic.PlasticField;
    021import org.apache.tapestry5.plastic.PropertyAccessType;
    022import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
    023import 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 */
    032public 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}