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package io.dropwizard.validation;

import io.dropwizard.util.Size;
import io.dropwizard.util.SizeUnit;

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

/**
 * Check that a {@link Size} being validated is greater than or equal to the
 * minimum value specified.
 */
public class MinSizeValidator implements ConstraintValidator {

    private long minQty;
    private SizeUnit minUnit;

    @Override
    public void initialize(MinSize constraintAnnotation) {
        this.minQty = constraintAnnotation.value();
        this.minUnit = constraintAnnotation.unit();
    }

    @Override
    public boolean isValid(Size value, ConstraintValidatorContext context) {
        return (value == null) || (value.toBytes() >= minUnit.toBytes(minQty));
    }
}