001package 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
022import org.apache.maven.model.Model;
023import org.apache.maven.model.building.ModelBuildingRequest;
024import org.apache.maven.model.building.ModelProblemCollector;
025
026/**
027 * Handles inheritance of model values.
028 * 
029 * @author Benjamin Bentmann
030 */
031public 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}