cn.crane4j.extension.jackson.JacksonJsonNodeAssistant Maven / Gradle / Ivy
package cn.crane4j.extension.jackson;
import cn.crane4j.core.util.ObjectUtils;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import lombok.Setter;
import org.checkerframework.checker.nullness.qual.NonNull;
import java.util.Objects;
/**
* Jackson json node assistant.
*
* @author huangchengxing
* @since 2.2.0
*/
public class JacksonJsonNodeAssistant implements JsonNodeAssistant {
@NonNull
private final ObjectMapper objectMapper;
@Setter
protected PropertyNamingStrategy namingStrategy;
/**
* Constructor.
*
* @param objectMapper object mapper
*/
public JacksonJsonNodeAssistant(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
this.namingStrategy = ObjectUtils.defaultIfNull(
objectMapper.getPropertyNamingStrategy(), objectMapper.getSerializationConfig().getPropertyNamingStrategy()
);
}
/**
* Determine the property name when reading or writing for json node.
*
*
Sometimes, the property name is not the same as the field name,
* such as the field name is "userName", but the property name is "user_name" in json node,
* we can override this method to determine the property name.
*
* @param propertyName property name
* @return property name in json node
*/
@Override
public String determinePropertyName(String propertyName) {
return Objects.isNull(namingStrategy) ?
propertyName : namingStrategy.nameForField(objectMapper.getSerializationConfig(), null, propertyName);
}
/**
* Convert the specified target to json node.
*
* @param target target
* @return json node
*/
@Override
public JsonNode convertTargetToJsonNode(Object target) {
return target instanceof JsonNode ?
(JsonNode)target : objectMapper.valueToTree(target);
}
}