001    package org.apache.maven.model.inheritance;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import org.apache.maven.model.Model;
023    import org.apache.maven.model.building.ModelBuildingRequest;
024    import org.apache.maven.model.building.ModelProblemCollector;
025    
026    /**
027     * Handles inheritance of model values.
028     * 
029     * @author Benjamin Bentmann
030     */
031    public interface InheritanceAssembler
032    {
033    
034        /**
035         * Merges values from the specified parent model into the given child model. Implementations are expected to keep
036         * parent and child completely decoupled by injecting deep copies of objects into the child rather than the original
037         * objects from the parent.
038         * 
039         * @param child The child model into which to merge the values inherited from the parent, must not be
040         *            <code>null</code>.
041         * @param parent The (read-only) parent model from which to inherit the values, may be <code>null</code>.
042         * @param request The model building request that holds further settings, must not be {@code null}.
043         * @param problems The container used to collect problems that were encountered, must not be {@code null}.
044         */
045        void assembleModelInheritance( Model child, Model parent, ModelBuildingRequest request,
046                                       ModelProblemCollector problems );
047    
048    }