public void updateParameters()

in sonar-plugin-server/src/main/java/jetbrains/buildserver/sonarplugin/buildfeatures/BranchesAndPullRequestsBuildStartContextProcessor.java [38:88]
40 lines of code
7 McCabe index (conditional complexity)

    public void updateParameters(BuildStartContext context) {

        if (context.getBuild().getBuildFeaturesOfType(BranchesAndPullRequestsBuildFeature.BUILD_FEATURE_TYPE).isEmpty()
                || context.getSharedParameters().containsKey(SQS_SYSENV)) {
            // Currently only GitHub is supported => if feature defined, it is for GitHub
            // If sysenv already defined (outside this processor), skip process.
            return;
        }

        if (!isTeamCityMinimalVersion(getServerVersionInfo())) {
            context.getBuild().getBuildLog().message(
                    String.format("Build feature '%s' requires TeamCity 2019.2 or above", BranchesAndPullRequestsBuildFeature.BUILD_FEATURE_NAME),
                    Status.ERROR, MessageAttrs.attrs());
            return;
        }

        String branchIsDefault = context.getSharedParameters().get("teamcity.build.branch.is_default");
        if (StringUtil.isEmpty(branchIsDefault) || Boolean.TRUE.equals(Boolean.valueOf(branchIsDefault))) {
            // No information or default branch, nothing to provide
            return;
        }

        final String type;
        final JsonObject json = new JsonObject();
        final String prNumber = context.getSharedParameters().get("teamcity.pullRequest.number");
        if (StringUtil.isEmpty(prNumber)) {
            // Branch
            type = "branch";
            final String vcsBranch = context.getSharedParameters().get("vcsroot.branch");
            json.addProperty("sonar.branch.name", context.getSharedParameters().get("teamcity.build.branch"));
            json.addProperty("sonar.branch.target", vcsBranch.substring(vcsBranch.indexOf("refs/heads/") + 11));
        } else {
            // Pull Request
            type = "pull-request";
            String repo = context.getSharedParameters().get("vcsroot.url");
            repo = repo.replaceFirst("^git@.*:", "");
            repo = repo.replaceFirst("^https?://[^/]*/", "");
            repo = repo.replaceFirst("\\.git$", "");

            json.addProperty("sonar.pullrequest.key", prNumber);
            json.addProperty("sonar.pullrequest.branch", context.getSharedParameters().get("teamcity.pullRequest.title"));
            json.addProperty("sonar.pullrequest.base", context.getSharedParameters().get("teamcity.pullRequest.target.branch"));
            json.addProperty("sonar.pullrequest.provider", "github");
            json.addProperty("sonar.pullrequest.github.repository", repo);
        }

        final String jsonString = json.toString();
        context.getBuild().getBuildLog().message(String.format("SonarQube plugin detects %s, '%s' set with '%s'", type, SQS_SYSENV, jsonString),
                Status.NORMAL, MessageAttrs.attrs());
        context.addSharedParameter(SQS_SYSENV, jsonString);
    }