/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.bval.constraints;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Digits;
import java.math.BigDecimal;
/**
* Validates that the <code>String</code> being validated consists of digits,
* and matches the pattern defined in the constraint.
*/
public class DigitsValidatorForString implements ConstraintValidator<Digits, String> {
private int integral;
private int fractional;
public int getIntegral() {
return integral;
}
public void setIntegral(int integral) {
this.integral = integral;
}
public int getFractional() {
return fractional;
}
public void setFractional(int fractional) {
this.fractional = fractional;
}
public void initialize(Digits annotation) {
this.integral = annotation.integer();
this.fractional = annotation.fraction();
if (integral < 0) {
throw new IllegalArgumentException(
"The length of the integer part cannot be negative.");
}
if (fractional < 0) {
throw new IllegalArgumentException(
"The length of the fraction part cannot be negative.");
}
}
public boolean isValid(String str, ConstraintValidatorContext context) {
//null values are valid
if (str == null) {
return true;
}
BigDecimal bigDecimal = getBigDecimalValue(str);
if (bigDecimal == null) {
return false;
}
int intLength = bigDecimal.precision() - bigDecimal.scale();
if (integral >= intLength) {
int factionLength = bigDecimal.scale() < 0 ? 0 : bigDecimal.scale();
return fractional >= factionLength;
} else {
return false;
}
}
private BigDecimal getBigDecimalValue(String str) {
BigDecimal bd;
try {
bd = new BigDecimal(str);
} catch (NumberFormatException nfe) {
return null;
}
return bd;
}
}