    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}