// Copyright 2006 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.tapestry.internal.services;
import org.apache.tapestry.annotations.Component;
import org.apache.tapestry.annotations.MixinClasses;
import org.apache.tapestry.annotations.Mixins;
import org.apache.tapestry.internal.KeyValue;
import org.apache.tapestry.internal.TapestryUtils;
import org.apache.tapestry.ioc.internal.util.InternalUtils;
import org.apache.tapestry.model.ComponentModel;
import org.apache.tapestry.model.MutableComponentModel;
import org.apache.tapestry.model.MutableEmbeddedComponentModel;
import org.apache.tapestry.services.ClassTransformation;
import org.apache.tapestry.services.ComponentClassResolver;
import org.apache.tapestry.services.ComponentClassTransformWorker;
import org.apache.tapestry.services.TransformConstants;
/**
* Finds fields with the {@link org.apache.tapestry.annotations.Component} annotation and updates
* the model. Also checks for the {@link Mixins} and {@link MixinClasses} annotations and uses them
* to update the {@link ComponentModel}.
*/
public class ComponentWorker implements ComponentClassTransformWorker
{
private final ComponentClassResolver _resolver;
public ComponentWorker(final ComponentClassResolver resolver)
{
_resolver = resolver;
}
public void transform(ClassTransformation transformation, MutableComponentModel model)
{
for (String fieldName : transformation.findFieldsWithAnnotation(Component.class))
{
Component annotation = transformation.getFieldAnnotation(fieldName, Component.class);
String id = annotation.id();
if (InternalUtils.isBlank(id))
id = InternalUtils.stripMemberPrefix(fieldName);
String type = transformation.getFieldType(fieldName);
MutableEmbeddedComponentModel embedded = model.addEmbeddedComponent(id, annotation
.type(), type);
addParameters(embedded, annotation.parameters());
transformation.makeReadOnly(fieldName);
String body = String.format(
"%s = (%s) %s.getEmbeddedComponent(\"%s\");",
fieldName,
type,
transformation.getResourcesFieldName(),
id);
transformation
.extendMethod(TransformConstants.CONTAINING_PAGE_DID_LOAD_SIGNATURE, body);
addMixinClasses(fieldName, transformation, embedded);
addMixinTypes(fieldName, transformation, embedded);
transformation.claimField(fieldName, annotation);
}
}
private void addMixinClasses(String fieldName, ClassTransformation transformation,
MutableEmbeddedComponentModel model)
{
MixinClasses annotation = transformation.getFieldAnnotation(fieldName, MixinClasses.class);
if (annotation == null)
return;
for (Class c : annotation.value())
model.addMixin(c.getName());
}
private void addMixinTypes(String fieldName, ClassTransformation transformation,
MutableEmbeddedComponentModel model)
{
Mixins annotation = transformation.getFieldAnnotation(fieldName, Mixins.class);
if (annotation == null)
return;
for (String typeName : annotation.value())
{
String mixinClassName = _resolver.resolveMixinTypeToClassName(typeName);
model.addMixin(mixinClassName);
}
}
private void addParameters(MutableEmbeddedComponentModel embedded, String[] parameters)
{
for (String parameter : parameters)
{
KeyValue kv = TapestryUtils.parseKeyValue(parameter);
embedded.addParameter(kv.getKey(), kv.getValue());
}
}
}