io.micronaut.context.converters.ContextConverterRegistrar 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.context.converters;
import io.micronaut.context.BeanContext;
import io.micronaut.context.annotation.Prototype;
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.util.Arrays;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
/**
* A converter registry for converters required by the context.
*
* @author graemerocher
* @since 2.0
*/
@Prototype
@Internal
public class ContextConverterRegistrar implements TypeConverterRegistrar {
private final BeanContext beanContext;
private final Map> classCache = new ConcurrentHashMap<>(10);
/**
* Default constructor.
* @param beanContext The bean context
*/
ContextConverterRegistrar(BeanContext beanContext) {
this.beanContext = beanContext;
}
@Override
public void register(MutableConversionService conversionService) {
conversionService.addConverter(String[].class, Class[].class, (object, targetType, context) -> {
Class[] classes = Arrays
.stream(object)
.map(str -> conversionService.convert(str, Class.class))
.filter(Optional::isPresent)
.map(Optional::get)
.toArray(Class[]::new);
return Optional.of(classes);
});
conversionService.addConverter(String.class, Class.class, (object, targetType, context) -> {
final Class result =
classCache.computeIfAbsent(object, s -> ClassUtils.forName(s, beanContext.getClassLoader()).orElse(MissingClass.class));
if (result == MissingClass.class) {
return Optional.empty();
}
return Optional.of(result);
}
);
}
/**
* Used to reference a missing class.
*/
private final class MissingClass {
}
}