001    // Copyright 2006, 2008, 2009 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;
016    
017    /**
018     * Object passed into a service contributor method that allows the method provide contributed values to the service's
019     * configuration.
020     * <p/>
021     * A service can <em>collect</em> contributions in three different ways:
022     * <ul>
023     * <li>As an un-ordered collection of values</li>
024     * <li>As an ordered list of values (where each value has a unique id, pre-requisites and post-requisites)</li>
025     * <li>As a map of keys and values
026     * </ul>
027     * <p/>
028     * This implementation is used for un-ordered configuration data.
029     * <p/>
030     * The service defines the <em>type</em> of contribution, in terms of a base class or service interface. Contributions
031     * must be compatible with the type.
032     */
033    public interface Configuration<T>
034    {
035        /**
036         * Adds an object to the service's contribution.
037         * 
038         * @param object
039         *            to add to the service's configuration
040         */
041        void add(T object);
042    
043        /**
044         * Automatically instantiates an instance of the class, with dependencies injected, and adds it to the
045         * configuration. When the configuration type is an interface and the class to be contributed is a local file,
046         * then a reloadable proxy for the class will be created and contributed.
047         * 
048         * @param clazz
049         *            what class to instantiate
050         * @since 5.1.0.0
051         */
052        void addInstance(Class<? extends T> clazz);
053    }