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sql2java common class package

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package gu.sql2java.json;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
 * Deserializing JSON property as String with Jackson

 * 实现将有{@code com.fasterxml.jackson.annotation.JsonRawValue}注解的
 * 内容为JSON的String类型字段反序列化为String的反序列化器实现
 * copy from 《Deserializing JSON property as String with Jackson》
 *
 */
public class RawJsonDeserializer extends JsonDeserializer {

    @Override
    public String deserialize(JsonParser jp, DeserializationContext ctxt)
           throws IOException, JsonProcessingException {
        ObjectMapper mapper = (ObjectMapper) jp.getCodec();
        JsonNode node = mapper.readTree(jp);
        return mapper.writeValueAsString(node);
    }
}