void processFile()

in emr-user-role-mapper-application/src/main/java/com/amazon/aws/emr/mapping/DefaultUserRoleMapperImpl.java [106:143]
36 lines of code
7 McCabe index (conditional complexity)

    void processFile(String jsonString) {
        log.info("Received the following JSON {}", jsonString);
        PrincipalRoleMappings principalRoleMappings = GSON.fromJson(jsonString, PrincipalRoleMappings.class);
        // Clear the old mapping now since we found a new valid mapping!
        userRoleMapping.clear();
        groupRoleMapping.clear();

        for (PrincipalRoleMapping principalRoleMapping : principalRoleMappings.getPrincipalRoleMappings()) {
            if (principalRoleMapping == null) {
                log.info("Invalid record!");
                continue;
            }
            String principal = principalRoleMapping.getUsername() != null ? principalRoleMapping.getUsername() :
                    principalRoleMapping.getGroupname();
            if (principal == null) {
                log.info("Invalid record containing no username or groupname");
                continue;
            }
            String roleArn = principalRoleMapping.getRoleArn();
            if (roleArn == null) {
                log.info("Invalid record containing no role ARN");
                continue;
            }
            AssumeRoleRequest assumeRoleRequest = new AssumeRoleRequest()
                    .withRoleArn(principalRoleMapping.getRoleArn())
                    .withRoleSessionName(principal) // Use principal as session name
                    .withDurationSeconds(principalRoleMapping.getDurationSeconds())
                    .withPolicy(principalRoleMapping.getPolicy())
                    .withSerialNumber(principalRoleMapping.getSerialNumber())
                    .withExternalId(principalRoleMapping.getExternalId());
            if (principalRoleMapping.getUsername() != null) {
                userRoleMapping.put(principal, assumeRoleRequest);
            } else {
                groupRoleMapping.put(principal, assumeRoleRequest);
            }
            log.info("Mapped {} to {}", principal, assumeRoleRequest);
        }
    }