private ModelData readParentLocally()

in compat/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java [866:990]
91 lines of code
23 McCabe index (conditional complexity)

    private ModelData readParentLocally(
            Model childModel,
            ModelSource childSource,
            ModelBuildingRequest request,
            DefaultModelProblemCollector problems)
            throws ModelBuildingException {
        final Parent parent = childModel.getParent();
        final ModelSource candidateSource;
        final Model candidateModel;
        final WorkspaceModelResolver resolver = request.getWorkspaceModelResolver();
        if (resolver == null) {
            candidateSource = getParentPomFile(childModel, childSource);

            if (candidateSource == null) {
                return null;
            }

            File pomFile = null;
            if (candidateSource instanceof FileModelSource source) {
                pomFile = source.getPomFile();
            }

            candidateModel = readModel(candidateSource, pomFile, request, problems);
        } else {
            try {
                candidateModel =
                        resolver.resolveRawModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());
            } catch (UnresolvableModelException e) {
                problems.add(new ModelProblemCollectorRequest(Severity.FATAL, Version.BASE) //
                        .setMessage(e.getMessage())
                        .setLocation(parent.getLocation(""))
                        .setException(e));
                throw problems.newModelBuildingException();
            }
            if (candidateModel == null) {
                return null;
            }
            candidateSource = new FileModelSource(candidateModel.getPomFile());
        }

        //
        // TODO jvz Why isn't all this checking the job of the duty of the workspace resolver, we know that we
        // have a model that is suitable, yet more checks are done here and the one for the version is problematic
        // before because with parents as ranges it will never work in this scenario.
        //

        String groupId = candidateModel.getGroupId();
        if (groupId == null && candidateModel.getParent() != null) {
            groupId = candidateModel.getParent().getGroupId();
        }
        String artifactId = candidateModel.getArtifactId();
        String version = candidateModel.getVersion();
        if (version == null && candidateModel.getParent() != null) {
            version = candidateModel.getParent().getVersion();
        }

        if (groupId == null
                || !groupId.equals(parent.getGroupId())
                || artifactId == null
                || !artifactId.equals(parent.getArtifactId())) {
            StringBuilder buffer = new StringBuilder(256);
            buffer.append("'parent.relativePath'");
            if (childModel != problems.getRootModel()) {
                buffer.append(" of POM ").append(ModelProblemUtils.toSourceHint(childModel));
            }
            buffer.append(" points at ").append(groupId).append(':').append(artifactId);
            buffer.append(" instead of ").append(parent.getGroupId()).append(':');
            buffer.append(parent.getArtifactId()).append(", please verify your project structure");

            problems.setSource(childModel);
            problems.add(new ModelProblemCollectorRequest(Severity.WARNING, Version.BASE)
                    .setMessage(buffer.toString())
                    .setLocation(parent.getLocation("")));
            return null;
        }
        if (version != null && parent.getVersion() != null && !version.equals(parent.getVersion())) {
            try {
                VersionRange parentRange = VersionRange.createFromVersionSpec(parent.getVersion());
                if (!parentRange.hasRestrictions()) {
                    // the parent version is not a range, we have version skew, drop back to resolution from repo
                    return null;
                }
                if (!parentRange.containsVersion(new DefaultArtifactVersion(version))) {
                    // version skew drop back to resolution from the repository
                    return null;
                }

                // Validate versions aren't inherited when using parent ranges the same way as when read externally.
                String rawChildModelVersion = childModel.getVersion();

                if (rawChildModelVersion == null) {
                    // Message below is checked for in the MNG-2199 core IT.
                    problems.add(new ModelProblemCollectorRequest(Severity.FATAL, Version.V31)
                            .setMessage("Version must be a constant")
                            .setLocation(childModel.getLocation("")));

                } else {
                    if (rawChildVersionReferencesParent(rawChildModelVersion)) {
                        // Message below is checked for in the MNG-2199 core IT.
                        problems.add(new ModelProblemCollectorRequest(Severity.FATAL, Version.V31)
                                .setMessage("Version must be a constant")
                                .setLocation(childModel.getLocation("version")));
                    }
                }

                // MNG-2199: What else to check here ?
            } catch (InvalidVersionSpecificationException e) {
                // invalid version range, so drop back to resolution from the repository
                return null;
            }
        }

        //
        // Here we just need to know that a version is fine to use but this validation we can do in our workspace
        // resolver.
        //

        /*
         * if ( version == null || !version.equals( parent.getVersion() ) ) { return null; }
         */

        ModelData parentData = new ModelData(candidateSource, candidateModel, groupId, artifactId, version);

        return parentData;
    }