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