// Copyright 2008 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.ComponentResources;
import org.apache.tapestry5.annotations.InjectComponent;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import org.apache.tapestry5.ioc.util.BodyBuilder;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.services.ClassTransformation;
import org.apache.tapestry5.services.ComponentClassTransformWorker;
import org.apache.tapestry5.services.TransformConstants;
/**
* Recognizes the {@link org.apache.tapestry5.annotations.InjectComponent} annotation, and converts the field into a
* read-only field containing the component. The id of the component may be explicitly stated or will be determined
* from the field name.
*/
public class InjectComponentWorker implements ComponentClassTransformWorker
{
public void transform(ClassTransformation transformation,
MutableComponentModel model)
{
for (String fieldName : transformation.findFieldsWithAnnotation(InjectComponent.class))
{
InjectComponent annotation = transformation.getFieldAnnotation(fieldName, InjectComponent.class);
String type = transformation.getFieldType(fieldName);
String resourcesFieldName = transformation.getResourcesFieldName();
String componentId = annotation.value();
if (InternalUtils.isBlank(componentId))
componentId = InternalUtils.stripMemberPrefix(fieldName);
transformation.makeReadOnly(fieldName);
BodyBuilder builder = new BodyBuilder().addln("try").begin();
builder.addln(
"%s = (%s) %s.getEmbeddedComponent(\"%s\");",
fieldName,
type,
resourcesFieldName,
componentId);
builder.end();
builder.addln("catch (ClassCastException ex)").begin();
builder.addln("throw new RuntimeException(%s.formatMessage(%s, \"%s\", \"%s\", \"%s\"), ex);",
getClass().getName(), resourcesFieldName, fieldName, type, componentId);
builder.end();
transformation.extendMethod(TransformConstants.CONTAINING_PAGE_DID_LOAD_SIGNATURE, builder.toString());
}
}
public static String formatMessage(ComponentResources resources, String fieldName, String fieldType,
String componentId)
{
return String.format(
"Unable to inject component '%s' into field %s of component %s. Class %s is not assignable to a field of type %s.",
componentId, fieldName, resources.getCompleteId(),
resources.getEmbeddedComponent(componentId).getClass().getName(), fieldType);
}
}