    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
    015    package org.apache.tapestry5.ioc.services;
    016
    017    import org.apache.tapestry5.ioc.ObjectProvider;
    018    import 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)
    031    public 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    }