/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.hibernate.validator.constraints.impl;
import java.math.BigDecimal;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Digits;
/**
* Validates that the <code>String</code> being validated consists of digits,
* and matches the pattern defined in the constraint.
*
* @author Alaa Nassef
* @author Hardy Ferentschik
*/
public class DigitsValidatorForString implements ConstraintValidator<Digits, String> {
private int maxIntegerLength;
private int maxFractionLength;
public void initialize(Digits constraintAnnotation) {
this.maxIntegerLength = constraintAnnotation.integer();
this.maxFractionLength = constraintAnnotation.fraction();
validateParameters();
}
public boolean isValid(String str, ConstraintValidatorContext constraintValidatorContext) {
//null values are valid
if ( str == null ) {
return true;
}
BigDecimal bigNum = getBigDecimalValue( str );
if ( bigNum == null ) {
return false;
}
int integerPartLength = bigNum.precision() - bigNum.scale();
int fractionPartLength = bigNum.scale() < 0 ? 0 : bigNum.scale();
return ( maxIntegerLength >= integerPartLength && maxFractionLength >= fractionPartLength );
}
private BigDecimal getBigDecimalValue(String str) {
BigDecimal bd;
try {
bd = new BigDecimal( str );
}
catch ( NumberFormatException nfe ) {
return null;
}
return bd;
}
private void validateParameters() {
if ( maxIntegerLength < 0 ) {
throw new IllegalArgumentException( "The length of the integer part cannot be negative." );
}
if ( maxFractionLength < 0 ) {
throw new IllegalArgumentException( "The length of the fraction part cannot be negative." );
}
}
}