Java(TM) Boutique - Tutorial - Data Validation with the Spring Framework

Listing 5: The TaskValidator class.

<TaskValidator>
package jbriscoe.article.spring.validation.validator;

import java.util.Calendar;

import jbriscoe.article.spring.validation.entity.Task;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.validator.GenericValidator;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;

public class TaskValidator extends DefaultValidator {

  private static final int HOURS_IN_DAY = 24;
  private Log log = LogFactory.getLog(getClass());

  protected Class getValidatorSupportClass() {
    return Task.class;
  }
  public void validate(final Object obj, final Errors errors) {
    log.debug("Begin TaskValidator validation.");
    final Task task = (Task) obj;
    // Task can't already be completed.
    if (Boolean.TRUE.equals(task.getCompleted())) {
      errors.rejectValue("completed", "errorCode");
    }
    // Must assign a priority.
    ValidationUtils.rejectIfEmpty(errors, "priority", "errorCode");
    // Due Date must not be null or before today.
    ValidationUtils.rejectIfEmpty(errors, "due", "errorCode");
    Calendar dueCal = null;
    if (task.getDue() != null) {
      dueCal = Calendar.getInstance();
	dueCal.setTime(task.getDue());
	final Calendar todayCal = Calendar.getInstance();
	todayCal.set(Calendar.HOUR_OF_DAY, 0);
	todayCal.set(Calendar.MINUTE, 0);
	todayCal.set(Calendar.SECOND, 0);
	todayCal.set(Calendar.MILLISECOND, 0);
	if (todayCal.after(dueCal)) {
	  errors.rejectValue("due", "errorCode");
	}
    }
    // Had to assign to an employee.
    ValidationUtils.rejectIfEmpty(errors, "assignedToEmployees", "errorCode");
    // Must have a positive estimate for hours.
    ValidationUtils.rejectIfEmpty(errors, "estimatedHoursToComplete","errorCode");
    if (task.getEstimatedHoursToComplete() != null) {
      if (GenericValidator.minValue(.01, task.getEstimatedHoursToComplete()
	  .doubleValue())) {
	  errors.rejectValue("estimatedHoursToComplete", "errorCode");
	}
	// Estimate must be within or equal to Due Date not past.
	if (dueCal != null) {
	  final Calendar rollingWorkCal = Calendar.getInstance();
	  rollingWorkCal.add(Calendar.DATE, new Double(Math.ceil((task
         .getEstimatedHoursToComplete().doubleValue() /HOURS_IN_DAY))).intValue());
	  rollingWorkCal.set(Calendar.HOUR_OF_DAY, 0);
	  rollingWorkCal.set(Calendar.MINUTE, 0);
	  rollingWorkCal.set(Calendar.SECOND, 0);
	  rollingWorkCal.set(Calendar.MILLISECOND, 0);
	  if (rollingWorkCal.after(dueCal)) {
          errors.rejectValue("estimatedHoursToComplete", "errorCode");
	  }
	}
    }
    // Must have a description.
    ValidationUtils.rejectIfEmptyOrWhitespace(errors, "description", "errorCode");
    log.debug("End TaskValidator validation.");
  }
}

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