private Model readParentLocally()

in impl/maven-impl/src/main/java/org/apache/maven/impl/model/DefaultModelBuilder.java [873:959]
70 lines of code
22 McCabe index (conditional complexity)

        private Model readParentLocally(Model childModel, DefaultProfileActivationContext profileActivationContext)
                throws ModelBuilderException {
            ModelSource candidateSource;

            Parent parent = childModel.getParent();
            String parentPath = parent.getRelativePath();
            if (request.getRequestType() == ModelBuilderRequest.RequestType.BUILD_PROJECT) {
                if (parentPath != null && !parentPath.isEmpty()) {
                    candidateSource = request.getSource().resolve(modelProcessor::locateExistingPom, parentPath);
                    if (candidateSource == null) {
                        wrongParentRelativePath(childModel);
                        return null;
                    }
                } else {
                    candidateSource =
                            resolveReactorModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());
                    if (candidateSource == null && parentPath == null) {
                        candidateSource = request.getSource().resolve(modelProcessor::locateExistingPom, "..");
                    }
                }
            } else {
                candidateSource = resolveReactorModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());
                if (candidateSource == null) {
                    if (parentPath == null) {
                        parentPath = "..";
                    }
                    if (!parentPath.isEmpty()) {
                        candidateSource = request.getSource().resolve(modelProcessor::locateExistingPom, parentPath);
                    }
                }
            }

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

            ModelBuilderSessionState derived = derive(candidateSource);
            Model candidateModel = derived.readAsParentModel(profileActivationContext);
            addActivePomProfiles(derived.result.getActivePomProfiles());

            String groupId = getGroupId(candidateModel);
            String artifactId = candidateModel.getArtifactId();
            String version = getVersion(candidateModel);

            // Ensure that relative path and GA match, if both are provided
            if (groupId == null
                    || !groupId.equals(parent.getGroupId())
                    || artifactId == null
                    || !artifactId.equals(parent.getArtifactId())) {
                mismatchRelativePathAndGA(childModel, groupId, artifactId);
                return null;
            }

            if (version != null && parent.getVersion() != null && !version.equals(parent.getVersion())) {
                try {
                    VersionRange parentRange = versionParser.parseVersionRange(parent.getVersion());
                    if (!parentRange.contains(versionParser.parseVersion(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.
                        add(Severity.FATAL, Version.V31, "Version must be a constant", childModel.getLocation(""));

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

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