Java Code Examples for org.eclipse.aether.DefaultRepositorySystemSession#setDependencyGraphTransformer()

private static DefaultRepositorySystemSession newSession(
    RepositorySystem system, DependencySelector dependencySelector) {
  DefaultRepositorySystemSession session = createDefaultRepositorySystemSession(system);
  session.setDependencySelector(dependencySelector);

  // By default, Maven's MavenRepositorySystemUtils.newSession() returns a session with
  // ChainedDependencyGraphTransformer(ConflictResolver(...), JavaDependencyContextRefiner()).
  // Because the full dependency graph does not resolve conflicts of versions, this session does
  // not use ConflictResolver.
  session.setDependencyGraphTransformer(
      new ChainedDependencyGraphTransformer(
          new CycleBreakerGraphTransformer(), // Avoids StackOverflowError
          new JavaDependencyContextRefiner()));

  // No dependency management in the full dependency graph
  session.setDependencyManager(null);

  return session;
}
 

@Test
public void testCycleBreaking() throws DependencyResolutionException {
  RepositorySystem system = RepositoryUtility.newRepositorySystem();
  DefaultRepositorySystemSession session =
      RepositoryUtility.createDefaultRepositorySystemSession(system);

  // This dependencySelector selects everything except test scope. This creates a dependency tree
  // with a cycle of dom4j:dom4j:jar:1.6.1 (optional) and jaxen:jaxen:jar:1.1-beta-6 (optional).
  session.setDependencySelector(new ScopeDependencySelector("test"));

  session.setDependencyGraphTransformer(
      new ChainedDependencyGraphTransformer(
          new CycleBreakerGraphTransformer(), // This prevents StackOverflowError
          new JavaDependencyContextRefiner()));

  // dom4j:1.6.1 is known to have a cycle
  CollectRequest collectRequest = new CollectRequest();
  collectRequest.setRepositories(ImmutableList.of(RepositoryUtility.CENTRAL));
  collectRequest.setRoot(new Dependency(new DefaultArtifact("dom4j:dom4j:1.6.1"), "compile"));
  DependencyRequest request = new DependencyRequest(collectRequest, null);

  // This should not raise StackOverflowError
  system.resolveDependencies(session, request);
}
 

@Override
public CollectResult collectDependencies(RepositorySystemSession session, CollectRequest request) throws DependencyCollectionException {
    DefaultRepositorySystemSession cloned = new DefaultRepositorySystemSession(session);
    DependencyGraphTransformer transformer = session.getDependencyGraphTransformer();
    //need to reset the transformer to prevent the transformation to happen and to it below separately.
    cloned.setDependencyGraphTransformer(null);
    CollectResult res = super.collectDependencies(cloned, request);
    CloningDependencyVisitor vis = new CloningDependencyVisitor();
    res.getRoot().accept(vis);

    //this part copied from DefaultDependencyCollector
    try {
        DefaultDependencyGraphTransformationContext context =
                new DefaultDependencyGraphTransformationContext(session);
        res.setRoot(transformer.transformGraph(res.getRoot(), context));
    } catch (RepositoryException e) {
        res.addException(e);
    }

    if (!res.getExceptions().isEmpty()) {
        throw new DependencyCollectionException(res);
    }
    res.getRoot().setData("NB_TEST", vis.getRootNode());
    return res;
}
 

private List<Dependency> obtainBomDependencies(final String urlLocation) {
    final Artifact artifact = downloadAndInstallArtifact(urlLocation).getArtifact();

    final Dependency dependency = new Dependency(artifact, JavaScopes.RUNTIME);

    final List<RemoteRepository> remoteRepositories = project.getRepositories().stream()
        .map(r -> new RemoteRepository.Builder(r.getId(), r.getLayout(), r.getUrl()).build())
        .collect(Collectors.toList());

    CollectResult result;
    try {
        final ArtifactDescriptorRequest descriptorRequest = new ArtifactDescriptorRequest(artifact, remoteRepositories, null);
        final ArtifactDescriptorResult descriptor = repository.readArtifactDescriptor(session, descriptorRequest);

        final List<Dependency> dependencies = Stream.concat(
            descriptor.getDependencies().stream(),
            descriptor.getManagedDependencies().stream())
            .collect(Collectors.toList());

        final DefaultRepositorySystemSession sessionToUse = new DefaultRepositorySystemSession(session);
        sessionToUse.setDependencyGraphTransformer(new NoopDependencyGraphTransformer());

        final CollectRequest request = new CollectRequest(dependency, dependencies, remoteRepositories);
        result = repository.collectDependencies(sessionToUse, request);
    } catch (final DependencyCollectionException | ArtifactDescriptorException e) {
        throw new IllegalStateException("Unabele to obtain BOM dependencies for: " + urlLocation, e);
    }

    final DependencyNode root = result.getRoot();

    final PostorderNodeListGenerator visitor = new PostorderNodeListGenerator();
    root.accept(visitor);

    return visitor.getDependencies(true);
}