| // Copyright 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.tapestry.services; |
| |
| import org.apache.tapestry.annotation.Environmental; |
| import org.apache.tapestry.ioc.services.PropertyShadowBuilder; |
| |
| /** |
| * Much like {@link PropertyShadowBuilder}, except that instead of accessing a property of some other service, it |
| * accesses a value from within the {@link Environment} service. This is useful for defining a new service that can be |
| * injected into other services (whereas the {@link Environmental} annotation may only be used within component |
| * classes). |
| */ |
| public interface EnvironmentalShadowBuilder |
| { |
| /** |
| * Returns a proxy that delegates all methods to an object obtained from {@link Environment#peekRequired(Class)}. |
| * Note that at the time this method is invoked, the Environment service may still be virtual, and will often not |
| * yet have been loaded with values, and that's OK, the resolution is deferred to the instant a method is invoked. |
| * |
| * @param <T> |
| * @param serviceType the service type, which is used to obtained the delegate instance |
| * @return a proxy to the service |
| */ |
| <T> T build(Class<T> serviceType); |
| } |