// 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.annotations.InjectContainer;
import org.apache.tapestry5.ioc.util.BodyBuilder;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.runtime.Component;
import org.apache.tapestry5.services.ClassTransformation;
import org.apache.tapestry5.services.ComponentClassTransformWorker;
import org.apache.tapestry5.services.TransformConstants;
import java.util.List;
/**
* Identifies the {@link org.apache.tapestry5.annotations.InjectContainer} annotation and adds code to initialize it to
* the core component.
*/
public class InjectContainerWorker implements ComponentClassTransformWorker
{
public void transform(ClassTransformation transformation, MutableComponentModel model)
{
List<String> names = transformation.findFieldsWithAnnotation(InjectContainer.class);
if (names.isEmpty())
return;
// I can't imagine a scenario where a component would have more than one
// field with InjectComponent, but that's the way these APIs work, lists of names.
BodyBuilder builder = new BodyBuilder();
builder.begin();
builder.addln("%s container = %s.getContainer();", Component.class.getName(), transformation
.getResourcesFieldName());
for (String fieldName : names)
{
InjectContainer annotation = transformation.getFieldAnnotation(
fieldName,
InjectContainer.class);
String fieldType = transformation.getFieldType(fieldName);
builder.addln("try");
builder.begin();
builder.addln("this.%s = (%s) container;", fieldName, fieldType);
builder.end();
builder.addln("catch (ClassCastException ex)");
builder.begin();
builder.addln(
"String message = %s.buildCastExceptionMessage(container, \"%s.%s\", \"%s\");",
InjectContainerWorker.class.getName(),
model.getComponentClassName(),
fieldName,
fieldType);
builder.addln("throw new RuntimeException(message, ex);");
builder.end();
transformation.makeReadOnly(fieldName);
transformation.claimField(fieldName, annotation);
}
builder.end();
transformation.extendMethod(TransformConstants.CONTAINING_PAGE_DID_LOAD_SIGNATURE, builder
.toString());
}
public static String buildCastExceptionMessage(Component component, String fieldName,
String fieldType)
{
return TransformMessages.componentNotAssignableToField(component, fieldName, fieldType);
}
}