/*
* Hibernate Validator, declare and validate application constraints
*
* License: Apache License, Version 2.0
* See the license.txt file in the root directory or <http://www.apache.org/licenses/LICENSE-2.0>.
*/
package org.hibernate.validator.internal.constraintvalidators.bv;
import java.math.BigDecimal;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Digits;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
/**
* Validates that the <code>Number</code> being validates matches the pattern
* defined in the constraint.
*
* @author Alaa Nassef
* @author Hardy Ferentschik
*/
public class DigitsValidatorForNumber implements ConstraintValidator<Digits, Number> {
private static final Log log = LoggerFactory.make();
private int maxIntegerLength;
private int maxFractionLength;
public void initialize(Digits constraintAnnotation) {
this.maxIntegerLength = constraintAnnotation.integer();
this.maxFractionLength = constraintAnnotation.fraction();
validateParameters();
}
public boolean isValid(Number num, ConstraintValidatorContext constraintValidatorContext) {
//null values are valid
if ( num == null ) {
return true;
}
BigDecimal bigNum;
if ( num instanceof BigDecimal ) {
bigNum = ( BigDecimal ) num;
}
else {
bigNum = new BigDecimal( num.toString() ).stripTrailingZeros();
}
int integerPartLength = bigNum.precision() - bigNum.scale();
int fractionPartLength = bigNum.scale() < 0 ? 0 : bigNum.scale();
return ( maxIntegerLength >= integerPartLength && maxFractionLength >= fractionPartLength );
}
private void validateParameters() {
if ( maxIntegerLength < 0 ) {
throw log.getInvalidLengthForIntegerPartException();
}
if ( maxFractionLength < 0 ) {
throw log.getInvalidLengthForFractionPartException();
}
}
}