| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.felix.ipojo; |
| |
| /** |
| * Interface implemented to support constructor parameter injection. |
| * When a new POJO object has to be created, all constructor injectors are |
| * called to gets the objects to injects as well as the type (to discover |
| * the constructor). |
| * Handlers willing to inject constructor parameters must register themselves |
| * using {@link InstanceManager#register(int, ConstructorInjector)} where |
| * the integer is the parameter index. Only one injector can inject a value |
| * for a specific index. If several injectors are registered for the same index, |
| * the component type is declared as invalid. |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public interface ConstructorInjector { |
| |
| /** |
| * Gets the object to inject in the constructor parameter. |
| * @param index the parameter index |
| * @return the object to be injected. |
| */ |
| Object getConstructorParameter(int index); |
| |
| /** |
| * Gets the type of the object to inject in the constructor parameter. |
| * This is the type looked into the Pojo class, so it must match. |
| * Returning <code>null</code> will try to get the class from the |
| * injected object, however this can be wrong (implementation instead of interface, |
| * boxed objects...) and error-prone. |
| * @param index the parameter index |
| * @return the Class object (must fit also for primitive type) |
| */ |
| Class getConstructorParameterType(int index); |
| |
| } |