001// Copyright 2009, 2010 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.ioc.services; 016 017import org.apache.tapestry5.ioc.ObjectProvider; 018import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration; 019 020/** 021 * Used to override built in services. Simply contribute a mapping from a type to an instance of that type. Anywhere 022 * that exact type is injected, without specifying markers or other annotations, the contributed instance will be 023 * injected, even if there is already a service that implements the interface. 024 * <p> 025 * In fact, this is <em>not</em> limited to overriding services; any object that can be injected based solely on type 026 * can be contributed. 027 * 028 * @since 5.1.0.0 029 */ 030@UsesMappedConfiguration(key = Class.class, value = Object.class) 031public interface ServiceOverride 032{ 033 /** 034 * Returns a provider based on the configuration; this is wired into the 035 * {@link org.apache.tapestry5.ioc.services.MasterObjectProvider}'s configuration. 036 */ 037 ObjectProvider getServiceOverrideProvider(); 038}