// 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 org.apache.tapestry5.ioc.ObjectLocator;

 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;

 /**

  * Performs injection triggered by any field annotated with the {@link org.apache.tapestry5.ioc.annotations.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;

     public InjectWorker(ObjectLocator locator, InjectionProvider injectionProvider)

     {

         this.locator = locator;

         this.injectionProvider = injectionProvider;

     }

     public final void transform(ClassTransformation transformation, MutableComponentModel model)

     {

         for (String fieldName : transformation.findFieldsWithAnnotation(Inject.class))

         {

             Inject annotation = transformation.getFieldAnnotation(fieldName, Inject.class);

             try

             {

                 String fieldType = transformation.getFieldType(fieldName);

                 Class type = transformation.toClass(fieldType);

                 boolean success = injectionProvider.provideInjection(

                         fieldName,

                         type,

                         locator,

                         transformation,

                         model);

                 if (success) transformation.claimField(fieldName, annotation);

             }

             catch (RuntimeException ex)

             {

                 throw new RuntimeException(TransformMessages.fieldInjectionError(transformation

                         .getClassName(), fieldName, ex), ex);

             }

         }

     }

 }