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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.model.normalization;
20  
21  import org.apache.maven.api.model.Model;
22  import org.apache.maven.model.building.ModelBuildingRequest;
23  import org.apache.maven.model.building.ModelProblemCollector;
24  
25  /**
26   * Handles normalization of a model. In this context, normalization is the process of producing a canonical
27   * representation for models that physically look different but are semantically equivalent.
28   *
29   * @author Benjamin Bentmann
30   */
31  public interface ModelNormalizer {
32  
33      /**
34       * Merges duplicate elements like multiple declarations of the same build plugin in the specified model.
35       *
36       * @param model The model whose duplicate elements should be merged, must not be {@code null}.
37       * @param request The model building request that holds further settings, must not be {@code null}.
38       * @param problems The container used to collect problems that were encountered, must not be {@code null}.
39       */
40      Model mergeDuplicates(Model model, ModelBuildingRequest request, ModelProblemCollector problems);
41  
42      /**
43       * Sets default values in the specified model that for technical reasons cannot be set directly in the Modello
44       * definition.
45       *
46       * @param model The model in which to set the default values, must not be {@code null}.
47       * @param request The model building request that holds further settings, must not be {@code null}.
48       * @param problems The container used to collect problems that were encountered, must not be {@code null}.
49       */
50      Model injectDefaultValues(Model model, ModelBuildingRequest request, ModelProblemCollector problems);
51  }