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1   package org.apache.maven.model.merge;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.ArrayList;
23  import java.util.LinkedHashMap;
24  import java.util.LinkedHashSet;
25  import java.util.List;
26  import java.util.Map;
27  import java.util.Set;
28  
29  import org.apache.maven.model.BuildBase;
30  import org.apache.maven.model.CiManagement;
31  import org.apache.maven.model.Contributor;
32  import org.apache.maven.model.Dependency;
33  import org.apache.maven.model.DeploymentRepository;
34  import org.apache.maven.model.Developer;
35  import org.apache.maven.model.DistributionManagement;
36  import org.apache.maven.model.Exclusion;
37  import org.apache.maven.model.Extension;
38  import org.apache.maven.model.InputLocation;
39  import org.apache.maven.model.IssueManagement;
40  import org.apache.maven.model.License;
41  import org.apache.maven.model.MailingList;
42  import org.apache.maven.model.Model;
43  import org.apache.maven.model.ModelBase;
44  import org.apache.maven.model.Organization;
45  import org.apache.maven.model.Plugin;
46  import org.apache.maven.model.PluginExecution;
47  import org.apache.maven.model.ReportPlugin;
48  import org.apache.maven.model.ReportSet;
49  import org.apache.maven.model.Repository;
50  import org.apache.maven.model.RepositoryBase;
51  import org.apache.maven.model.Scm;
52  import org.apache.maven.model.Site;
53  
54  /**
55   * The domain-specific model merger for the Maven POM, overriding generic code from parent class when necessary with
56   * more adapted algorithms.
57   *
58   * @author Benjamin Bentmann
59   */
60  public class MavenModelMerger
61      extends ModelMerger
62  {
63  
64      /**
65       * The hint key for the child path adjustment used during inheritance for URL calculations.
66       */
67      public static final String CHILD_PATH_ADJUSTMENT = "child-path-adjustment";
68  
69      /**
70       * The context key for the artifact id of the target model.
71       */
72      private static final String ARTIFACT_ID = "artifact-id";
73  
74      @Override
75      protected void mergeModel( Model target, Model source, boolean sourceDominant, Map<Object, Object> context )
76      {
77          context.put( ARTIFACT_ID, target.getArtifactId() );
78  
79          super.mergeModel( target, source, sourceDominant, context );
80      }
81  
82      @Override
83      protected void mergeModel_Name( Model target, Model source, boolean sourceDominant, Map<Object, Object> context )
84      {
85          String src = source.getName();
86          if ( src != null )
87          {
88              if ( sourceDominant )
89              {
90                  target.setName( src );
91                  target.setLocation( "name", source.getLocation( "name" ) );
92              }
93          }
94      }
95  
96      @Override
97      protected void mergeModel_Url( Model target, Model source, boolean sourceDominant, Map<Object, Object> context )
98      {
99          String src = source.getUrl();
100         if ( src != null )
101         {
102             if ( sourceDominant )
103             {
104                 target.setUrl( src );
105                 target.setLocation( "url", source.getLocation( "url" ) );
106             }
107             else if ( target.getUrl() == null )
108             {
109                 target.setUrl( appendPath( src, context ) );
110                 target.setLocation( "url", source.getLocation( "url" ) );
111             }
112         }
113     }
114 
115     /*
116      * TODO: Whether the merge continues recursively into an existing node or not could be an option for the generated
117      * merger
118      */
119     @Override
120     protected void mergeModel_Organization( Model target, Model source, boolean sourceDominant,
121                                             Map<Object, Object> context )
122     {
123         Organization src = source.getOrganization();
124         if ( src != null )
125         {
126             Organization tgt = target.getOrganization();
127             if ( tgt == null )
128             {
129                 tgt = new Organization();
130                 tgt.setLocation( "", src.getLocation( "" ) );
131                 target.setOrganization( tgt );
132                 mergeOrganization( tgt, src, sourceDominant, context );
133             }
134         }
135     }
136 
137     @Override
138     protected void mergeModel_IssueManagement( Model target, Model source, boolean sourceDominant,
139                                                Map<Object, Object> context )
140     {
141         IssueManagement src = source.getIssueManagement();
142         if ( src != null )
143         {
144             IssueManagement tgt = target.getIssueManagement();
145             if ( tgt == null )
146             {
147                 tgt = new IssueManagement();
148                 tgt.setLocation( "", src.getLocation( "" ) );
149                 target.setIssueManagement( tgt );
150                 mergeIssueManagement( tgt, src, sourceDominant, context );
151             }
152         }
153     }
154 
155     @Override
156     protected void mergeModel_CiManagement( Model target, Model source, boolean sourceDominant,
157                                             Map<Object, Object> context )
158     {
159         CiManagement src = source.getCiManagement();
160         if ( src != null )
161         {
162             CiManagement tgt = target.getCiManagement();
163             if ( tgt == null )
164             {
165                 tgt = new CiManagement();
166                 tgt.setLocation( "", src.getLocation( "" ) );
167                 target.setCiManagement( tgt );
168                 mergeCiManagement( tgt, src, sourceDominant, context );
169             }
170         }
171     }
172 
173     @Override
174     protected void mergeModel_ModelVersion( Model target, Model source, boolean sourceDominant,
175                                             Map<Object, Object> context )
176     {
177         // neither inherited nor injected
178     }
179 
180     @Override
181     protected void mergeModel_ArtifactId( Model target, Model source, boolean sourceDominant,
182                                           Map<Object, Object> context )
183     {
184         // neither inherited nor injected
185     }
186 
187     @Override
188     protected void mergeModel_Profiles( Model target, Model source, boolean sourceDominant,
189                                         Map<Object, Object> context )
190     {
191         // neither inherited nor injected
192     }
193 
194     @Override
195     protected void mergeModel_Prerequisites( Model target, Model source, boolean sourceDominant,
196                                              Map<Object, Object> context )
197     {
198         // neither inherited nor injected
199     }
200 
201     @Override
202     protected void mergeModel_Licenses( Model target, Model source, boolean sourceDominant,
203                                         Map<Object, Object> context )
204     {
205         if ( target.getLicenses().isEmpty() )
206         {
207             target.setLicenses( new ArrayList<License>( source.getLicenses() ) );
208         }
209     }
210 
211     @Override
212     protected void mergeModel_Developers( Model target, Model source, boolean sourceDominant,
213                                           Map<Object, Object> context )
214     {
215         if ( target.getDevelopers().isEmpty() )
216         {
217             target.setDevelopers( new ArrayList<Developer>( source.getDevelopers() ) );
218         }
219     }
220 
221     @Override
222     protected void mergeModel_Contributors( Model target, Model source, boolean sourceDominant,
223                                             Map<Object, Object> context )
224     {
225         if ( target.getContributors().isEmpty() )
226         {
227             target.setContributors( new ArrayList<Contributor>( source.getContributors() ) );
228         }
229     }
230 
231     @Override
232     protected void mergeModel_MailingLists( Model target, Model source, boolean sourceDominant,
233                                             Map<Object, Object> context )
234     {
235         if ( target.getMailingLists().isEmpty() )
236         {
237             target.setMailingLists( new ArrayList<MailingList>( source.getMailingLists() ) );
238         }
239     }
240 
241     @Override
242     protected void mergeModelBase_Modules( ModelBase target, ModelBase source, boolean sourceDominant,
243                                            Map<Object, Object> context )
244     {
245         List<String> src = source.getModules();
246         if ( !src.isEmpty() && sourceDominant )
247         {
248             List<Integer> indices = new ArrayList<Integer>();
249             List<String> tgt = target.getModules();
250             Set<String> excludes = new LinkedHashSet<String>( tgt );
251             List<String> merged = new ArrayList<String>( tgt.size() + src.size() );
252             merged.addAll( tgt );
253             for ( int i = 0, n = tgt.size(); i < n; i++ )
254             {
255                 indices.add( i );
256             }
257             for ( int i = 0, n = src.size(); i < n; i++ )
258             {
259                 String s = src.get( i );
260                 if ( !excludes.contains( s ) )
261                 {
262                     merged.add( s );
263                     indices.add( ~i );
264                 }
265             }
266             target.setModules( merged );
267             target.setLocation( "modules", InputLocation.merge( target.getLocation( "modules" ),
268                                                                 source.getLocation( "modules" ), indices ) );
269         }
270     }
271 
272     /*
273      * TODO: The order of the merged list could be controlled by an attribute in the model association: target-first,
274      * source-first, dominant-first, recessive-first
275      */
276     @Override
277     protected void mergeModelBase_Repositories( ModelBase target, ModelBase source, boolean sourceDominant,
278                                                 Map<Object, Object> context )
279     {
280         List<Repository> src = source.getRepositories();
281         if ( !src.isEmpty() )
282         {
283             List<Repository> tgt = target.getRepositories();
284             Map<Object, Repository> merged = new LinkedHashMap<Object, Repository>( ( src.size() + tgt.size() ) * 2 );
285 
286             List<Repository> dominant, recessive;
287             if ( sourceDominant )
288             {
289                 dominant = src;
290                 recessive = tgt;
291             }
292             else
293             {
294                 dominant = tgt;
295                 recessive = src;
296             }
297 
298             for ( Repository element : dominant )
299             {
300                 Object key = getRepositoryKey( element );
301                 merged.put( key, element );
302             }
303 
304             for ( Repository element : recessive )
305             {
306                 Object key = getRepositoryKey( element );
307                 if ( !merged.containsKey( key ) )
308                 {
309                     merged.put( key, element );
310                 }
311             }
312 
313             target.setRepositories( new ArrayList<Repository>( merged.values() ) );
314         }
315     }
316 
317     protected void mergeModelBase_PluginRepositories( ModelBase target, ModelBase source, boolean sourceDominant,
318                                                       Map<Object, Object> context )
319     {
320         List<Repository> src = source.getPluginRepositories();
321         if ( !src.isEmpty() )
322         {
323             List<Repository> tgt = target.getPluginRepositories();
324             Map<Object, Repository> merged = new LinkedHashMap<Object, Repository>( ( src.size() + tgt.size() ) * 2 );
325 
326             List<Repository> dominant, recessive;
327             if ( sourceDominant )
328             {
329                 dominant = src;
330                 recessive = tgt;
331             }
332             else
333             {
334                 dominant = tgt;
335                 recessive = src;
336             }
337 
338             for ( Repository element : dominant )
339             {
340                 Object key = getRepositoryKey( element );
341                 merged.put( key, element );
342             }
343 
344             for ( Repository element : recessive )
345             {
346                 Object key = getRepositoryKey( element );
347                 if ( !merged.containsKey( key ) )
348                 {
349                     merged.put( key, element );
350                 }
351             }
352 
353             target.setPluginRepositories( new ArrayList<Repository>( merged.values() ) );
354         }
355     }
356 
357     /*
358      * TODO: Whether duplicates should be removed looks like an option for the generated merger.
359      */
360     @Override
361     protected void mergeBuildBase_Filters( BuildBase target, BuildBase source, boolean sourceDominant,
362                                            Map<Object, Object> context )
363     {
364         List<String> src = source.getFilters();
365         if ( !src.isEmpty() )
366         {
367             List<String> tgt = target.getFilters();
368             Set<String> excludes = new LinkedHashSet<String>( tgt );
369             List<String> merged = new ArrayList<String>( tgt.size() + src.size() );
370             merged.addAll( tgt );
371             for ( String s : src )
372             {
373                 if ( !excludes.contains( s ) )
374                 {
375                     merged.add( s );
376                 }
377             }
378             target.setFilters( merged );
379         }
380     }
381 
382     @Override
383     protected void mergeBuildBase_Resources( BuildBase target, BuildBase source, boolean sourceDominant,
384                                              Map<Object, Object> context )
385     {
386         if ( sourceDominant || target.getResources().isEmpty() )
387         {
388             super.mergeBuildBase_Resources( target, source, sourceDominant, context );
389         }
390     }
391 
392     @Override
393     protected void mergeBuildBase_TestResources( BuildBase target, BuildBase source, boolean sourceDominant,
394                                                  Map<Object, Object> context )
395     {
396         if ( sourceDominant || target.getTestResources().isEmpty() )
397         {
398             super.mergeBuildBase_TestResources( target, source, sourceDominant, context );
399         }
400     }
401 
402     @Override
403     protected void mergeDistributionManagement_Repository( DistributionManagement target,
404                                                            DistributionManagement source, boolean sourceDominant,
405                                                            Map<Object, Object> context )
406     {
407         DeploymentRepository src = source.getRepository();
408         if ( src != null )
409         {
410             DeploymentRepository tgt = target.getRepository();
411             if ( sourceDominant || tgt == null )
412             {
413                 tgt = new DeploymentRepository();
414                 tgt.setLocation( "", src.getLocation( "" ) );
415                 target.setRepository( tgt );
416                 mergeDeploymentRepository( tgt, src, sourceDominant, context );
417             }
418         }
419     }
420 
421     @Override
422     protected void mergeDistributionManagement_SnapshotRepository( DistributionManagement target,
423                                                                    DistributionManagement source,
424                                                                    boolean sourceDominant,
425                                                                    Map<Object, Object> context )
426     {
427         DeploymentRepository src = source.getSnapshotRepository();
428         if ( src != null )
429         {
430             DeploymentRepository tgt = target.getSnapshotRepository();
431             if ( sourceDominant || tgt == null )
432             {
433                 tgt = new DeploymentRepository();
434                 tgt.setLocation( "", src.getLocation( "" ) );
435                 target.setSnapshotRepository( tgt );
436                 mergeDeploymentRepository( tgt, src, sourceDominant, context );
437             }
438         }
439     }
440 
441     @Override
442     protected void mergeDistributionManagement_Site( DistributionManagement target, DistributionManagement source,
443                                                      boolean sourceDominant, Map<Object, Object> context )
444     {
445         Site src = source.getSite();
446         if ( src != null )
447         {
448             Site tgt = target.getSite();
449             if ( sourceDominant || tgt == null )
450             {
451                 tgt = new Site();
452                 tgt.setLocation( "", src.getLocation( "" ) );
453                 target.setSite( tgt );
454                 mergeSite( tgt, src, sourceDominant, context );
455             }
456         }
457     }
458 
459     @Override
460     protected void mergeSite_Url( Site target, Site source, boolean sourceDominant, Map<Object, Object> context )
461     {
462         String src = source.getUrl();
463         if ( src != null )
464         {
465             if ( sourceDominant )
466             {
467                 target.setUrl( src );
468                 target.setLocation( "url", source.getLocation( "url" ) );
469             }
470             else if ( target.getUrl() == null )
471             {
472                 target.setUrl( appendPath( src, context ) );
473                 target.setLocation( "url", source.getLocation( "url" ) );
474             }
475         }
476     }
477 
478     @Override
479     protected void mergeScm_Url( Scm target, Scm source, boolean sourceDominant, Map<Object, Object> context )
480     {
481         String src = source.getUrl();
482         if ( src != null )
483         {
484             if ( sourceDominant )
485             {
486                 target.setUrl( src );
487                 target.setLocation( "url", source.getLocation( "url" ) );
488             }
489             else if ( target.getUrl() == null )
490             {
491                 target.setUrl( appendPath( src, context ) );
492                 target.setLocation( "url", source.getLocation( "url" ) );
493             }
494         }
495     }
496 
497     @Override
498     protected void mergeScm_Connection( Scm target, Scm source, boolean sourceDominant, Map<Object, Object> context )
499     {
500         String src = source.getConnection();
501         if ( src != null )
502         {
503             if ( sourceDominant )
504             {
505                 target.setConnection( src );
506                 target.setLocation( "connection", source.getLocation( "connection" ) );
507             }
508             else if ( target.getConnection() == null )
509             {
510                 target.setConnection( appendPath( src, context ) );
511                 target.setLocation( "connection", source.getLocation( "connection" ) );
512             }
513         }
514     }
515 
516     @Override
517     protected void mergeScm_DeveloperConnection( Scm target, Scm source, boolean sourceDominant,
518                                                  Map<Object, Object> context )
519     {
520         String src = source.getDeveloperConnection();
521         if ( src != null )
522         {
523             if ( sourceDominant )
524             {
525                 target.setDeveloperConnection( src );
526                 target.setLocation( "developerConnection", source.getLocation( "developerConnection" ) );
527             }
528             else if ( target.getDeveloperConnection() == null )
529             {
530                 target.setDeveloperConnection( appendPath( src, context ) );
531                 target.setLocation( "developerConnection", source.getLocation( "developerConnection" ) );
532             }
533         }
534     }
535 
536     @Override
537     protected void mergePlugin_Executions( Plugin target, Plugin source, boolean sourceDominant,
538                                            Map<Object, Object> context )
539     {
540         List<PluginExecution> src = source.getExecutions();
541         if ( !src.isEmpty() )
542         {
543             List<PluginExecution> tgt = target.getExecutions();
544             Map<Object, PluginExecution> merged =
545                 new LinkedHashMap<Object, PluginExecution>( ( src.size() + tgt.size() ) * 2 );
546 
547             for ( PluginExecution element : src )
548             {
549                 if ( sourceDominant
550                                 || ( element.getInherited() != null ? element.isInherited() : source.isInherited() ) )
551                 {
552                     Object key = getPluginExecutionKey( element );
553                     merged.put( key, element );
554                 }
555             }
556 
557             for ( PluginExecution element : tgt )
558             {
559                 Object key = getPluginExecutionKey( element );
560                 PluginExecution existing = merged.get( key );
561                 if ( existing != null )
562                 {
563                     mergePluginExecution( element, existing, sourceDominant, context );
564                 }
565                 merged.put( key, element );
566             }
567 
568             target.setExecutions( new ArrayList<PluginExecution>( merged.values() ) );
569         }
570     }
571 
572     @Override
573     protected void mergePluginExecution_Goals( PluginExecution target, PluginExecution source, boolean sourceDominant,
574                                                Map<Object, Object> context )
575     {
576         List<String> src = source.getGoals();
577         if ( !src.isEmpty() )
578         {
579             List<String> tgt = target.getGoals();
580             Set<String> excludes = new LinkedHashSet<String>( tgt );
581             List<String> merged = new ArrayList<String>( tgt.size() + src.size() );
582             merged.addAll( tgt );
583             for ( String s : src )
584             {
585                 if ( !excludes.contains( s ) )
586                 {
587                     merged.add( s );
588                 }
589             }
590             target.setGoals( merged );
591         }
592     }
593 
594     @Override
595     protected void mergeReportPlugin_ReportSets( ReportPlugin target, ReportPlugin source, boolean sourceDominant,
596                                                  Map<Object, Object> context )
597     {
598         List<ReportSet> src = source.getReportSets();
599         if ( !src.isEmpty() )
600         {
601             List<ReportSet> tgt = target.getReportSets();
602             Map<Object, ReportSet> merged = new LinkedHashMap<Object, ReportSet>( ( src.size() + tgt.size() ) * 2 );
603 
604             for ( ReportSet element : src )
605             {
606                 if ( sourceDominant || ( element.getInherited() != null ? element.isInherited() : source.isInherited() ) )
607                 {
608                     Object key = getReportSetKey( element );
609                     merged.put( key, element );
610                 }
611             }
612 
613             for ( ReportSet element : tgt )
614             {
615                 Object key = getReportSetKey( element );
616                 ReportSet existing = merged.get( key );
617                 if ( existing != null )
618                 {
619                     mergeReportSet( element, existing, sourceDominant, context );
620                 }
621                 merged.put( key, element );
622             }
623 
624             target.setReportSets( new ArrayList<ReportSet>( merged.values() ) );
625         }
626     }
627 
628     @Override
629     protected Object getDependencyKey( Dependency dependency )
630     {
631         return dependency.getManagementKey();
632     }
633 
634     @Override
635     protected Object getPluginKey( Plugin plugin )
636     {
637         return plugin.getKey();
638     }
639 
640     @Override
641     protected Object getPluginExecutionKey( PluginExecution pluginExecution )
642     {
643         return pluginExecution.getId();
644     }
645 
646     @Override
647     protected Object getReportPluginKey( ReportPlugin reportPlugin )
648     {
649         return reportPlugin.getKey();
650     }
651 
652     @Override
653     protected Object getReportSetKey( ReportSet reportSet )
654     {
655         return reportSet.getId();
656     }
657 
658     @Override
659     protected Object getRepositoryBaseKey( RepositoryBase repositoryBase )
660     {
661         return repositoryBase.getId();
662     }
663 
664     @Override
665     protected Object getExtensionKey( Extension extension )
666     {
667         return extension.getGroupId() + ':' + extension.getArtifactId();
668     }
669 
670     @Override
671     protected Object getExclusionKey( Exclusion exclusion )
672     {
673         return exclusion.getGroupId() + ':' + exclusion.getArtifactId();
674     }
675 
676     private String appendPath( String parentPath, Map<Object, Object> context )
677     {
678         Object artifactId = context.get( ARTIFACT_ID );
679         Object childPathAdjustment = context.get( CHILD_PATH_ADJUSTMENT );
680 
681         if ( artifactId != null && childPathAdjustment != null )
682         {
683             return appendPath( parentPath, artifactId.toString(), childPathAdjustment.toString() );
684         }
685         else
686         {
687             return parentPath;
688         }
689     }
690 
691     private String appendPath( String parentPath, String childPath, String pathAdjustment )
692     {
693         String path = parentPath;
694         path = concatPath( path, pathAdjustment );
695         path = concatPath( path, childPath );
696         return path;
697     }
698 
699     private String concatPath( String base, String path )
700     {
701         String result = base;
702 
703         if ( path != null && path.length() > 0 )
704         {
705             if ( ( result.endsWith( "/" ) && !path.startsWith( "/" ) )
706                 || ( !result.endsWith( "/" ) && path.startsWith( "/" ) ) )
707             {
708                 result += path;
709             }
710             else if ( result.endsWith( "/" ) && path.startsWith( "/" ) )
711             {
712                 result += path.substring( 1 );
713             }
714             else
715             {
716                 result += '/';
717                 result += path;
718             }
719             if ( base.endsWith( "/" ) && !result.endsWith( "/" ) )
720             {
721                 result += '/';
722             }
723         }
724 
725         return result;
726     }
727 
728 }