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    }