org.springframework.validation.annotation.ValidationAnnotationUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2023 the original author or 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 org.springframework.validation.annotation;
import java.lang.annotation.Annotation;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.lang.Nullable;
/**
* Utility class for handling validation annotations.
* Mainly for internal use within the framework.
*
* @author Christoph Dreis
* @author Juergen Hoeller
* @since 5.3.7
*/
public abstract class ValidationAnnotationUtils {
private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
/**
* Determine any validation hints by the given annotation.
* This implementation checks for Spring's
* {@link org.springframework.validation.annotation.Validated},
* {@code @javax.validation.Valid}, and custom annotations whose
* name starts with "Valid" which may optionally declare validation
* hints through the "value" attribute.
* @param ann the annotation (potentially a validation annotation)
* @return the validation hints to apply (possibly an empty array),
* or {@code null} if this annotation does not trigger any validation
*/
@Nullable
public static Object[] determineValidationHints(Annotation ann) {
// Direct presence of @Validated ?
if (ann instanceof Validated) {
return ((Validated) ann).value();
}
// Direct presence of @Valid ?
Class annotationType = ann.annotationType();
if ("javax.validation.Valid".equals(annotationType.getName())) {
return EMPTY_OBJECT_ARRAY;
}
// Meta presence of @Validated ?
Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
if (validatedAnn != null) {
return validatedAnn.value();
}
// Custom validation annotation ?
if (annotationType.getSimpleName().startsWith("Valid")) {
return convertValidationHints(AnnotationUtils.getValue(ann));
}
// No validation triggered
return null;
}
private static Object[] convertValidationHints(@Nullable Object hints) {
if (hints == null) {
return EMPTY_OBJECT_ARRAY;
}
return (hints instanceof Object[] ? (Object[]) hints : new Object[]{hints});
}
}