// Copyright 2006, 2007, 2010 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.services;
import org.apache.tapestry5.ioc.Messages;
import org.apache.tapestry5.ioc.ObjectLocator;
import org.apache.tapestry5.ioc.services.MasterObjectProvider;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.services.ClassTransformation;
import org.apache.tapestry5.services.InjectionProvider;
import org.apache.tapestry5.services.TransformField;
/**
* Worker for the {@link org.apache.tapestry5.ioc.annotations.Inject} annotation that delegates out to the master
* {@link org.apache.tapestry5.ioc.services.MasterObjectProvider} to access the value. This worker must be scheduled
* after certain other workers, such as {@link BlockInjectionProvider} (which is keyed off a combination of type and
* the Inject annotation).
*
* @see org.apache.tapestry5.ioc.services.MasterObjectProvider
*/
public class DefaultInjectionProvider implements InjectionProvider
{
private final MasterObjectProvider masterObjectProvider;
private final ObjectLocator locator;
public DefaultInjectionProvider(MasterObjectProvider masterObjectProvider, ObjectLocator locator)
{
this.masterObjectProvider = masterObjectProvider;
this.locator = locator;
}
@SuppressWarnings("unchecked")
public boolean provideInjection(String fieldName, Class fieldType, ObjectLocator locator,
final ClassTransformation transformation, MutableComponentModel componentModel)
{
// I hate special cases, but we have a conflict between the ObjectProvider contributed so as to inject
// the global application messages into services, and the injection of per-component Messages into components.
// For yet other reasons, this InjectionProvider gets invoked before CommonResources, and will attempt
// to inject the wrong Messages (the global application messages, not the component messages) ... so we
// make a special check here.
if (fieldType.equals(Messages.class))
return false;
TransformField field = transformation.getField(fieldName);
Object injectionValue = masterObjectProvider.provide(fieldType, field, this.locator, false);
// Null means that no ObjectProvider could provide the value. We have set up the chain of
// command so that InjectResources can give it a try next. Later, we'll try to match against
// a service.
if (injectionValue != null)
{
field.inject(injectionValue);
return true;
}
return false;
}
}