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Add NullKeyToEmptyStringSerializer - to allow jackson serialization of a map with a null key

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darin.kelkhoff
2024-12-11 14:40:06 -06:00
parent f3546da8cc
commit 5434721c8e
2 changed files with 74 additions and 1 deletions
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45
qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/utils/JsonUtils.java
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@ -30,11 +30,14 @@ import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.kingsrook.qqq.backend.core.logging.QLogger;
import com.kingsrook.qqq.backend.core.model.data.QRecord;
@ -54,6 +57,11 @@ public class JsonUtils
{
private static final QLogger LOG = QLogger.getLogger(JsonUtils.class);
//////////////////////////////////////////////////////////////////////
// see https://www.baeldung.com/jackson-map-null-values-or-null-key //
//////////////////////////////////////////////////////////////////////
public static NullKeyToEmptyStringSerializer nullKeyToEmptyStringSerializer = new NullKeyToEmptyStringSerializer();
/*******************************************************************************
@ -396,4 +404,41 @@ public class JsonUtils
return (record);
}
/***************************************************************************
**
***************************************************************************/
public static class NullKeyToEmptyStringSerializer extends StdSerializer<Object>
{
/***************************************************************************
**
***************************************************************************/
public NullKeyToEmptyStringSerializer()
{
this(null);
}
/***************************************************************************
**
***************************************************************************/
public NullKeyToEmptyStringSerializer(Class<Object> t)
{
super(t);
}
/***************************************************************************
**
***************************************************************************/
@Override
public void serialize(Object nullKey, JsonGenerator jsonGenerator, SerializerProvider unused) throws IOException
{
jsonGenerator.writeFieldName("");
}
}
}