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io.micronaut.jackson.convert.JacksonConverterRegistrar 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
*
* 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 io.micronaut.jackson.convert;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import io.micronaut.core.bind.BeanPropertyBinder;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.convert.TypeConverter;
import io.micronaut.core.convert.TypeConverterRegistrar;
import io.micronaut.core.convert.value.ConvertibleValues;
import io.micronaut.core.naming.NameUtils;
import io.micronaut.core.reflect.InstantiationUtils;
import io.micronaut.core.type.Argument;
import io.micronaut.core.util.StringUtils;
import javax.inject.Provider;
import javax.inject.Singleton;
import java.util.*;
import java.util.function.BiFunction;
/**
* Converter registrar for Jackson.
*
* @author graemerocher
* @since 2.0
*/
@Singleton
public class JacksonConverterRegistrar implements TypeConverterRegistrar {
private final Provider objectMapper;
private final ConversionService conversionService;
private final Provider beanPropertyBinder;
/**
* Default constructor.
* @param objectMapper The object mapper provider
* @param beanPropertyBinder The bean property binder provider
* @param conversionService The conversion service
*/
protected JacksonConverterRegistrar(
Provider objectMapper,
Provider beanPropertyBinder,
ConversionService conversionService) {
this.objectMapper = objectMapper;
this.conversionService = conversionService;
this.beanPropertyBinder = beanPropertyBinder;
}
@Override
public void register(ConversionService conversionService) {
conversionService.addConverter(
ArrayNode.class,
Object[].class,
arrayNodeToObjectConverter()
);
conversionService.addConverter(
ArrayNode.class,
Iterable.class,
arrayNodeToIterableConverter()
);
conversionService.addConverter(
JsonNode.class,
Object.class,
jsonNodeToObjectConverter()
);
conversionService.addConverter(
ObjectNode.class,
ConvertibleValues.class,
objectNodeToConvertibleValuesConverter()
);
conversionService.addConverter(
Object.class,
JsonNode.class,
objectToJsonNodeConverter()
);
conversionService.addConverter(
Map.class,
Object.class,
mapToObjectConverter()
);
conversionService.addConverter(
CharSequence.class,
PropertyNamingStrategy.class,
(TypeConverter) (charSequence, targetType, context) -> {
PropertyNamingStrategy propertyNamingStrategy = null;
if (charSequence != null) {
String stringValue = NameUtils.environmentName(charSequence.toString());
if (StringUtils.isNotEmpty(stringValue)) {
switch (stringValue) {
case "SNAKE_CASE":
propertyNamingStrategy = PropertyNamingStrategy.SNAKE_CASE;
break;
case "UPPER_CAMEL_CASE":
propertyNamingStrategy = PropertyNamingStrategy.UPPER_CAMEL_CASE;
break;
case "LOWER_CASE":
propertyNamingStrategy = PropertyNamingStrategy.LOWER_CASE;
break;
case "KEBAB_CASE":
propertyNamingStrategy = PropertyNamingStrategy.KEBAB_CASE;
break;
case "LOWER_CAMEL_CASE":
propertyNamingStrategy = PropertyNamingStrategy.LOWER_CAMEL_CASE;
break;
default:
break;
}
}
}
if (propertyNamingStrategy == null) {
context.reject(charSequence, new IllegalArgumentException(String.format("Unable to convert '%s' to a com.fasterxml.jackson.databind.PropertyNamingStrategy", charSequence)));
}
return Optional.ofNullable(propertyNamingStrategy);
}
);
}
/**
* @return The map to object converter
*/
protected TypeConverter mapToObjectConverter() {
return (map, targetType, context) -> {
final BiFunction, Object> propertiesBinderFunction = (object, properties) -> {
Map bindMap = new LinkedHashMap(properties.size());
for (Map.Entry entry : properties.entrySet()) {
Object key = entry.getKey();
bindMap.put(NameUtils.decapitalize(NameUtils.dehyphenate(key.toString())), entry.getValue());
}
return beanPropertyBinder.get().bind(object, bindMap);
};
Optional instance = InstantiationUtils.tryInstantiate(targetType, map, context)
.map(object -> propertiesBinderFunction.apply(object, map));
if (instance.isPresent()) {
return instance;
} else if (targetType.isInstance(map)) {
return Optional.of(map);
} else {
return InstantiationUtils
.tryInstantiate(targetType)
.map(object -> propertiesBinderFunction.apply(object, map));
}
};
}
/**
* @return A converter that converts an object to a json node
*/
protected TypeConverter objectToJsonNodeConverter() {
return (object, targetType, context) -> {
try {
return Optional.of(objectMapper.get().valueToTree(object));
} catch (IllegalArgumentException e) {
context.reject(e);
return Optional.empty();
}
};
}
/**
* @return A converter that converts object nodes to convertible values
*/
protected TypeConverter objectNodeToConvertibleValuesConverter() {
return (object, targetType, context) -> Optional.of(new ObjectNodeConvertibleValues<>(object, conversionService));
}
/**
* @return The JSON node to object converter
*/
protected TypeConverter jsonNodeToObjectConverter() {
return (node, targetType, context) -> {
try {
if (CharSequence.class.isAssignableFrom(targetType) && node instanceof ObjectNode) {
return Optional.of(node.toString());
} else {
Object result = objectMapper.get().treeToValue(node, targetType);
return Optional.ofNullable(result);
}
} catch (JsonProcessingException e) {
context.reject(e);
return Optional.empty();
}
};
}
/**
* @return Converts array nodes to iterables.
*/
protected TypeConverter arrayNodeToIterableConverter() {
return (node, targetType, context) -> {
Map> typeVariables = context.getTypeVariables();
Class elementType = typeVariables.isEmpty() ? Map.class : typeVariables.values().iterator().next().getType();
List results = new ArrayList();
node.elements().forEachRemaining(jsonNode -> {
Optional converted = conversionService.convert(jsonNode, elementType, context);
if (converted.isPresent()) {
results.add(converted.get());
}
});
return Optional.of(results);
};
}
/**
* @return Converts array nodes to objects.
*/
protected TypeConverter arrayNodeToObjectConverter() {
return (node, targetType, context) -> {
try {
Object[] result = objectMapper.get().treeToValue(node, targetType);
return Optional.of(result);
} catch (JsonProcessingException e) {
context.reject(e);
return Optional.empty();
}
};
}
}
