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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.lifecycle.internal;
20  
21  import javax.inject.Named;
22  import javax.inject.Singleton;
23  
24  import java.util.ArrayList;
25  import java.util.Collections;
26  import java.util.List;
27  
28  import org.apache.maven.execution.MavenSession;
29  import org.apache.maven.lifecycle.internal.builder.BuilderCommon;
30  import org.apache.maven.project.MavenProject;
31  
32  /**
33   * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
34   *
35   * @since 3.0
36   */
37  @Named
38  @Singleton
39  public class BuildListCalculator {
40      public ProjectBuildList calculateProjectBuilds(MavenSession session, List<TaskSegment> taskSegments) {
41          List<ProjectSegment> projectBuilds = new ArrayList<>();
42  
43          MavenProject rootProject = session.getTopLevelProject();
44  
45          for (TaskSegment taskSegment : taskSegments) {
46              List<MavenProject> projects;
47  
48              if (taskSegment.isAggregating()) {
49                  projects = Collections.singletonList(rootProject);
50              } else {
51                  projects = session.getProjects();
52              }
53              for (MavenProject project : projects) {
54                  ClassLoader tccl = Thread.currentThread().getContextClassLoader();
55                  MavenProject currentProject = session.getCurrentProject();
56                  try {
57                      BuilderCommon.attachToThread(project); // Not totally sure if this is needed for anything
58                      session.setCurrentProject(project);
59                      projectBuilds.add(new ProjectSegment(project, taskSegment, session));
60                  } finally {
61                      session.setCurrentProject(currentProject);
62                      Thread.currentThread().setContextClassLoader(tccl);
63                  }
64              }
65          }
66          return new ProjectBuildList(projectBuilds);
67      }
68  }