private TaskProgressInterval getSubInterval(
     final TaskProgressInterval taskProgressInterval,
     final int subIntervalStart,
     final int subIntervalEnd) {
   if (taskProgressInterval == null) {
     return null;
   } else {
     return taskProgressInterval.getSubInterval(subIntervalStart, subIntervalEnd);
   }
 }
  private MappingResult validateAndAutoMapFields(
      final JiraServiceContext jiraServiceContext,
      final ProjectImportOptions projectImportOptions,
      final ProjectImportData projectImportData,
      final BackupProject backupProject,
      final BackupSystemInformation backupSystemInformation,
      final TaskProgressInterval taskProgressInterval) {
    log.info(
        "Project Import: Mapping the backed up data to data in the current system, and validating the mappings...");
    final MappingResult mappingResult = buildMappingResult();
    final I18nHelper i18n = jiraServiceContext.getI18nBean();

    // Step 2 Map and validate the Issue Types
    projectImportManager.autoMapAndValidateIssueTypes(
        projectImportData, mappingResult, backupProject, jiraServiceContext.getI18nBean());

    // If there is a problem processing the issue types then we don't want to do any further
    // mappings or validation
    if ((mappingResult.getIssueTypeMessageSet() != null)
        && !mappingResult.getIssueTypeMessageSet().hasAnyErrors()) {
      // Try to map the custom fields
      projectImportManager.autoMapAndValidateCustomFields(
          projectImportData, mappingResult, backupProject, i18n);

      if (!mappingResult.getCustomFieldMessageSet().hasAnyErrors()) {
        // Only map the system fields if we can move forward with the custom fields
        projectImportManager.autoMapSystemFields(projectImportData, backupProject);

        // Only map the project roles if we can move forward with the custom fields
        projectImportManager.autoMapProjectRoles(projectImportData);

        // Only map the custom field values once we know that the custom fields are good
        projectImportManager.autoMapCustomFieldOptions(projectImportData, backupProject);

        final boolean importAttachments =
            !StringUtils.isEmpty(projectImportOptions.getAttachmentPath());
        final int customFieldValuePercentage = (importAttachments) ? 60 : 90;
        // if we can successfully map the custom fields then lets validate the custom field values
        try {
          // Create a TaskProgressProcessor for validateCustomFieldValues
          final TaskProgressInterval subInterval =
              getSubInterval(taskProgressInterval, 0, customFieldValuePercentage);
          EntityCountTaskProgressProcessor taskProgressProcessor = null;
          if (taskProgressInterval != null) {
            taskProgressProcessor =
                new EntityCountTaskProgressProcessor(
                    subInterval,
                    i18n.getText(
                        "admin.message.project.import.manager.do.mapping.validate.custom.field.values"),
                    projectImportData.getCustomFieldValuesEntityCount(),
                    i18n);
          }
          projectImportManager.validateCustomFieldValues(
              projectImportData, mappingResult, backupProject, taskProgressProcessor, i18n);
        } catch (final IOException e) {
          log.error(
              "There was a problem accessing the file '"
                  + projectImportData.getPathToCustomFieldValuesXml()
                  + "' when performing a project import.",
              e);
          jiraServiceContext
              .getErrorCollection()
              .addErrorMessage(
                  getText(
                      i18n,
                      "admin.errors.project.import.problem.reading.custom.field.xml",
                      projectImportData.getPathToCustomFieldValuesXml()));
          return null;
        } catch (final SAXException e) {
          log.error(
              "There was a problem accessing the file '"
                  + projectImportData.getPathToCustomFieldValuesXml()
                  + "' when performing a project import.",
              e);
          jiraServiceContext
              .getErrorCollection()
              .addErrorMessage(
                  getText(
                      i18n,
                      "admin.errors.project.import.custom.field.sax.problem",
                      projectImportData.getPathToCustomFieldValuesXml(),
                      e.getMessage()));
          return null;
        }

        // Only validate the system field mappings after we have done all the rest
        // Create a sub interval of the taskProgressInterval we were given.
        TaskProgressInterval sysFieldSubInterval = null;
        if (taskProgressInterval != null) {
          sysFieldSubInterval =
              taskProgressInterval.getSubInterval(
                  customFieldValuePercentage, customFieldValuePercentage + 10);
        }
        projectImportManager.validateSystemFields(
            projectImportData,
            mappingResult,
            projectImportOptions,
            backupProject,
            sysFieldSubInterval,
            i18n);

        // Validate the attachments if we are importing attachments
        if (!importAttachments) {
          final MessageSet messageSet = new MessageSetImpl();
          messageSet.addWarningMessage(
              getText(i18n, "admin.warning.project.import.mapping.no.backup.atttachment.path"));
          log.warn(
              "File attachments will not be imported because you have not provided a backup attachment path.");
          mappingResult.setFileAttachmentMessageSet(messageSet);
        } else {
          try {
            // Create a TaskProgressProcessor for validateFileAttachments
            final TaskProgressInterval attachmentSubInterval =
                getSubInterval(taskProgressInterval, 70, 100);
            EntityCountTaskProgressProcessor taskProgressProcessor = null;
            if (taskProgressInterval != null) {
              taskProgressProcessor =
                  new EntityCountTaskProgressProcessor(
                      attachmentSubInterval,
                      i18n.getText(
                          "admin.message.project.import.manager.do.mapping.validate.file.attachment.values"),
                      projectImportData.getFileAttachmentEntityCount(),
                      i18n);
            }
            projectImportManager.validateFileAttachments(
                projectImportOptions,
                projectImportData,
                mappingResult,
                backupProject,
                backupSystemInformation,
                taskProgressProcessor,
                i18n);
          } catch (final IOException e) {
            log.error(
                "There was a problem accessing the file '"
                    + projectImportData.getPathToFileAttachmentXml()
                    + "' when performing a project import.",
                e);
            jiraServiceContext
                .getErrorCollection()
                .addErrorMessage(
                    getText(
                        i18n,
                        "admin.errors.project.import.problem.reading.attachment.xml",
                        projectImportData.getPathToFileAttachmentXml()));
            return null;
          } catch (final SAXException e) {
            log.error(
                "There was a problem accessing the file '"
                    + projectImportData.getPathToFileAttachmentXml()
                    + "' when performing a project import.",
                e);
            jiraServiceContext
                .getErrorCollection()
                .addErrorMessage(
                    getText(
                        i18n,
                        "admin.errors.project.import.custom.field.sax.problem",
                        projectImportData.getPathToFileAttachmentXml(),
                        e.getMessage()));
            return null;
          }
        }
      } else {
        // When the required custom fields have not passed validation we still want to show that
        // validation has
        // not happened for each of the custom field values.
        addCustomFieldValuesNotCheckedMessageSets(projectImportData, mappingResult);
      }
    } else {
      // When the required issue types have not passed validation we still want to show that
      // validation has
      // not happened for each of the custom field values.
      addCustomFieldValuesNotCheckedMessageSets(projectImportData, mappingResult);
    }

    // We want to populate the message list of the results. This puts the message results into order
    // and gives
    // them i18n header labels
    createValidationMessageList(mappingResult, projectImportData, i18n);

    if (mappingResult.canImport()) {
      log.info("Project Import: No validation errors were found and the import can continue.");
    } else {
      log.info("Project Import: Validation errors were found. The import cannot continue.");
    }
    return mappingResult;
  }