001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.spi;
018
019/**
020 * A pluggable strategy for creating and possibly dependency injecting objects
021 * which could be implemented using straight forward reflection or using Spring
022 * or Guice to perform dependency injection.
023 * 
024 * @version 
025 */
026public interface Injector {
027
028    /**
029     * Instantiates a new instance of the given type possibly injecting values
030     * into the object in the process
031     * 
032     * @param type the type of object to create
033     * @return a newly created instance
034     */
035    <T> T newInstance(Class<T> type);
036
037    /**
038     * Instantiates a new instance of the given object type possibly injecting values
039     * into the object in the process
040     *
041     * @param type the type of object to create
042     * @param instance an instance of the type to create
043     * @return a newly created instance
044     */
045    <T> T newInstance(Class<T> type, Object instance);
046
047    /**
048     * Whether the injector supports creating new instances using auto-wiring.
049     * If this is possible then bean instances is attempt first to be created this way
050     * and if not, then the bean can only be created if there is a public no-arg constructor.
051     */
052    boolean supportsAutoWiring();
053
054}