io.micronaut.validation.validator.constraints.DigitsValidator Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original authors
*
* 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
*
* https://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 io.micronaut.validation.validator.constraints;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import javax.validation.constraints.Digits;
import java.math.BigDecimal;
/**
* Abstract {@link Digits} validator implementation.
* @param The target type
*
* @author graemerocher
* @since 1.2
*/
@FunctionalInterface
public interface DigitsValidator extends ConstraintValidator {
@Override
default boolean isValid(@Nullable T value, @NonNull AnnotationValue annotationMetadata, @NonNull ConstraintValidatorContext context) {
if (value == null) {
// null valid according to spec
return true;
}
final int intMax = annotationMetadata.get("integer", int.class).orElse(0);
if (intMax < 0) {
throw new IllegalArgumentException("The length of the integer part cannot be negative.");
}
final int fracMax = annotationMetadata.get("fraction", int.class).orElse(0);
if (fracMax < 0) {
throw new IllegalArgumentException("The length of the fraction part cannot be negative.");
}
BigDecimal bigDecimal;
try {
bigDecimal = getBigDecimal(value);
} catch (NumberFormatException e) {
return false;
}
int intLen = bigDecimal.precision() - bigDecimal.scale();
int fracLen = bigDecimal.scale() < 0 ? 0 : bigDecimal.scale();
return intMax >= intLen && fracMax >= fracLen;
}
/**
* Resolve a big decimal for the given value.
* @param value The value
* @return The big decimal
*/
BigDecimal getBigDecimal(@NonNull T value);
}