001 // Copyright 2006, 2007, 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.ComponentResources;
018 import org.apache.tapestry5.annotations.InjectContainer;
019 import org.apache.tapestry5.internal.services.ComponentClassCache;
020 import org.apache.tapestry5.model.MutableComponentModel;
021 import org.apache.tapestry5.plastic.*;
022 import org.apache.tapestry5.runtime.Component;
023 import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
024 import org.apache.tapestry5.services.transform.TransformationSupport;
025
026 /**
027 * Identifies the {@link org.apache.tapestry5.annotations.InjectContainer} annotation and adds code
028 * to initialize it to
029 * the core component.
030 */
031 public class InjectContainerWorker implements ComponentClassTransformWorker2
032 {
033 private final ComponentClassCache cache;
034
035 public InjectContainerWorker(ComponentClassCache cache)
036 {
037 this.cache = cache;
038 }
039
040 public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
041 {
042 for (final PlasticField field : plasticClass.getFieldsWithAnnotation(InjectContainer.class))
043 {
044 transformField(field);
045 }
046 }
047
048 private void transformField(PlasticField field)
049 {
050 InjectContainer annotation = field.getAnnotation(InjectContainer.class);
051
052 field.claim(annotation);
053
054 ComputedValue<FieldConduit<Object>> provider = createFieldValueConduitProvider(field);
055
056 field.setComputedConduit(provider);
057 }
058
059 private ComputedValue<FieldConduit<Object>> createFieldValueConduitProvider(PlasticField field)
060 {
061 final String fieldName = field.getName();
062
063 final String fieldTypeName = field.getTypeName();
064
065 return new ComputedValue<FieldConduit<Object>>()
066 {
067 public FieldConduit<Object> get(InstanceContext context)
068 {
069 final Class fieldType = cache.forName(fieldTypeName);
070 final ComponentResources resources = context.get(ComponentResources.class);
071
072 return new ReadOnlyComponentFieldConduit(resources, fieldName)
073 {
074 public Object get(Object instance, InstanceContext context)
075 {
076 Component container = resources.getContainer();
077
078 if (!fieldType.isInstance(container))
079 {
080 String message = String.format(
081 "Component %s (type %s) is not assignable to field %s.%s (of type %s).", container
082 .getComponentResources().getCompleteId(), container.getClass().getName(), resources.getComponentModel()
083 .getComponentClassName(), fieldName, fieldTypeName);
084
085 throw new RuntimeException(message);
086 }
087
088 return container;
089 }
090 };
091 }
092 };
093 }
094 }