    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}