UpdateStackRequestValidator.java

package com.sequenceiq.cloudbreak.validation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import com.sequenceiq.cloudbreak.api.model.InstanceGroupAdjustmentJson;
import com.sequenceiq.cloudbreak.api.model.UpdateStackJson;

public class UpdateStackRequestValidator implements ConstraintValidator<ValidUpdateStackRequest, UpdateStackJson> {

    @Override
    public void initialize(ValidUpdateStackRequest constraintAnnotation) {
    }

    @Override
    public boolean isValid(UpdateStackJson value, ConstraintValidatorContext context) {
        int updateResources = 0;
        if (value.getStatus() != null) {
            updateResources++;
        }
        InstanceGroupAdjustmentJson instanceGroupAdjustment = value.getInstanceGroupAdjustment();
        if (instanceGroupAdjustment != null) {
            updateResources++;
            if (instanceGroupAdjustment.getWithClusterEvent() && instanceGroupAdjustment.getScalingAdjustment() < 0) {
                addConstraintViolation(context,
                        "Invalid PUT request on this resource. Update event has to be upscale if you define withClusterEvent = 'true'.");
                return false;
            }
        }

        if (updateResources != 1) {
            addConstraintViolation(context, "Invalid PUT request on this resource. 1 update request is allowed at a time.");
            return false;
        }
        return true;
    }

    private void addConstraintViolation(ConstraintValidatorContext context, String message) {
        context.buildConstraintViolationWithTemplate(message)
                .addPropertyNode("status")
                .addConstraintViolation();
    }

}