/*
* Copyright 2010 Google Inc.
*
* 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 com.google.gwt.validation.client.constraints;
import java.math.BigDecimal;
import javax.validation.ConstraintValidator;
import javax.validation.constraints.Digits;
/**
* Abstract {@link Digits} constraint validator implementation for a
* <code>T</code>.
*
* @param <T> the type of object to validate
*/
public abstract class AbstractDigitsValidator<T> implements
ConstraintValidator<Digits, T> {
private int fraction;
private int integer;
public final void initialize(Digits constraintAnnotation) {
if (!(constraintAnnotation.fraction() >= 0)) {
throw new IllegalArgumentException(
"@Digits.fraction must be a nonnegative nubmer");
}
if (!(constraintAnnotation.integer() >= 0)) {
throw new IllegalArgumentException(
"@Digits.integer must be a nonnegative nubmer");
}
fraction = constraintAnnotation.fraction();
integer = constraintAnnotation.integer();
}
protected final boolean isValid(BigDecimal bigValue) {
int integerLength = bigValue.precision() - bigValue.scale();
if (integerLength > integer) {
return false;
}
int fractionalLength = bigValue.scale() < 0 ? 0 : bigValue.scale();
return fractionalLength <= fraction;
}
}