// Copyright 2006, 2007 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.internal.transform;
import java.lang.annotation.Annotation;
import java.util.List;
import javax.inject.Named;
import org.apache.tapestry5.func.Predicate;
import org.apache.tapestry5.ioc.ObjectLocator;
import org.apache.tapestry5.ioc.OperationTracker;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.services.ClassTransformation;
import org.apache.tapestry5.services.ComponentClassTransformWorker;
import org.apache.tapestry5.services.InjectionProvider;
import org.apache.tapestry5.services.TransformField;
/**
* Performs injection triggered by any field annotated with the {@link org.apache.tapestry5.ioc.annotations.Inject}
* annotation or the {@link javax.inject.Inject} annotation.
* <p/>
* The implementation of this worker mostly delegates to a chain of command of
* {@link org.apache.tapestry5.services.InjectionProvider}s.
*/
public class InjectWorker implements ComponentClassTransformWorker
{
private final ObjectLocator locator;
// Really, a chain of command
private final InjectionProvider injectionProvider;
private final OperationTracker tracker;
public InjectWorker(ObjectLocator locator, InjectionProvider injectionProvider, OperationTracker tracker)
{
this.locator = locator;
this.injectionProvider = injectionProvider;
this.tracker = tracker;
}
public final void transform(final ClassTransformation transformation, final MutableComponentModel model)
{
List<TransformField> fields = matchFields(transformation);
for (final TransformField field : fields)
{
final String fieldName = field.getName();
tracker.run("Injecting field " + fieldName, new Runnable()
{
public void run()
{
Inject inject = field.getAnnotation(Inject.class);
Annotation annotation = inject == null? field.getAnnotation(javax.inject.Inject.class): inject;
try
{
String fieldType = field.getType();
Class type = transformation.toClass(fieldType);
boolean success = injectionProvider.provideInjection(fieldName, type, locator, transformation,
model);
if (success)
field.claim(annotation);
}
catch (RuntimeException ex)
{
throw new RuntimeException(TransformMessages.fieldInjectionError(transformation.getClassName(),
fieldName, ex), ex);
}
}
});
}
}
private List<TransformField> matchFields(final ClassTransformation transformation)
{
Predicate<TransformField> predicate = new Predicate<TransformField>()
{
public boolean accept(TransformField field)
{
return field.getAnnotation(Inject.class) != null
|| (field.getAnnotation(javax.inject.Inject.class) != null && field.getAnnotation(Named.class) == null);
}
};
return transformation.matchFields(predicate);
}
}