001/* 002 * Copyright 2002-2016 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory; 018 019import org.springframework.beans.BeansException; 020 021/** 022 * A variant of {@link ObjectFactory} designed specifically for injection points, 023 * allowing for programmatic optionality and lenient not-unique handling. 024 * 025 * @author Juergen Hoeller 026 * @since 4.3 027 */ 028public interface ObjectProvider<T> extends ObjectFactory<T> { 029 030 /** 031 * Return an instance (possibly shared or independent) of the object 032 * managed by this factory. 033 * <p>Allows for specifying explicit construction arguments, along the 034 * lines of {@link BeanFactory#getBean(String, Object...)}. 035 * @param args arguments to use when creating a corresponding instance 036 * @return an instance of the bean 037 * @throws BeansException in case of creation errors 038 * @see #getObject() 039 */ 040 T getObject(Object... args) throws BeansException; 041 042 /** 043 * Return an instance (possibly shared or independent) of the object 044 * managed by this factory. 045 * @return an instance of the bean, or {@code null} if not available 046 * @throws BeansException in case of creation errors 047 * @see #getObject() 048 */ 049 T getIfAvailable() throws BeansException; 050 051 /** 052 * Return an instance (possibly shared or independent) of the object 053 * managed by this factory. 054 * @return an instance of the bean, or {@code null} if not available or 055 * not unique (i.e. multiple candidates found with none marked as primary) 056 * @throws BeansException in case of creation errors 057 * @see #getObject() 058 */ 059 T getIfUnique() throws BeansException; 060 061}