| // 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.ioc.internal.services; |
| |
| import org.apache.tapestry.ioc.AnnotationProvider; |
| import org.apache.tapestry.ioc.ObjectLocator; |
| import org.apache.tapestry.ioc.ObjectProvider; |
| import org.apache.tapestry.ioc.services.MasterObjectProvider; |
| |
| import java.util.List; |
| |
| public class MasterObjectProviderImpl implements MasterObjectProvider |
| { |
| private final List<ObjectProvider> configuration; |
| |
| public MasterObjectProviderImpl(List<ObjectProvider> configuration) |
| { |
| this.configuration = configuration; |
| } |
| |
| public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider, ObjectLocator locator, |
| boolean required) |
| { |
| for (ObjectProvider provider : configuration) |
| { |
| T result = provider.provide(objectType, annotationProvider, locator); |
| |
| if (result != null) return result; |
| } |
| |
| // If required, then we must obtain it the hard way, by |
| // seeing if there's a single service that implements the interface. |
| |
| if (required) return locator.getService(objectType); |
| |
| return null; |
| } |
| |
| } |