io.micronaut.inject.annotation.AnnotationConvertersRegistrar Maven / Gradle / Ivy
/*
* Copyright 2017-2022 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.inject.annotation;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.convert.MutableConversionService;
import io.micronaut.core.convert.TypeConverterRegistrar;
import io.micronaut.core.reflect.ClassUtils;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
/**
* Registers annotation converters.
*
* @author Denis Stepanov
* @since 3.6.0
*/
@Internal
public final class AnnotationConvertersRegistrar implements TypeConverterRegistrar {
@Override
public void register(MutableConversionService conversionService) {
conversionService.addConverter(io.micronaut.core.annotation.AnnotationValue.class, Annotation.class, (object, targetType, context) -> {
@SuppressWarnings("unchecked") Class aClass =
(Class) ClassUtils.forName(object.getAnnotationName(), targetType.getClassLoader()).orElse(null);
if (aClass != null) {
return Optional.of(AnnotationMetadataSupport.buildAnnotation(aClass, object));
}
return Optional.empty();
});
conversionService.addConverter(io.micronaut.core.annotation.AnnotationValue[].class, Object[].class, (object, targetType, context) -> {
List result = new ArrayList<>();
Class annotationClass = null;
for (io.micronaut.core.annotation.AnnotationValue annotationValue : object) {
if (annotationClass == null) {
// all annotations will be on the same type
@SuppressWarnings("unchecked") Class aClass =
(Class) ClassUtils.forName(annotationValue.getAnnotationName(), targetType.getClassLoader()).orElse(null);
if (aClass == null) {
break;
}
annotationClass = aClass;
}
Annotation annotation = AnnotationMetadataSupport.buildAnnotation(annotationClass, annotationValue);
result.add(annotation);
}
if (!result.isEmpty()) {
return Optional.of(result.toArray((Object[]) Array.newInstance(annotationClass, result.size())));
}
return Optional.empty();
});
}
}