How to use

_neitherNull

method

in

com.fasterxml.jackson.databind.ser.std.StdSerializer

/**
 * @since 2.7
 */
protected void visitArrayFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
    JsonSerializer<?> itemSerializer, JavaType itemType)
  throws JsonMappingException
{
  JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
  if (_neitherNull(v2, itemSerializer)) {
    v2.itemsFormat(itemSerializer, itemType);
  }
}

/**
 * Helper method that calls necessary visit method(s) to indicate that the
 * underlying JSON type is JSON Integer number.
 *
 * @since 2.7
 */
protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
    NumberType numberType)
  throws JsonMappingException
{
  JsonIntegerFormatVisitor v2 = visitor.expectIntegerFormat(typeHint);
  if (_neitherNull(v2, numberType)) {
    v2.numberType(numberType);
  }
}

/**
 * @deprecated Since 2.9 use {link {@link #findContextualConvertingSerializer} instead
 */
@Deprecated
protected JsonSerializer<?> findConvertingContentSerializer(SerializerProvider provider,
    BeanProperty prop, JsonSerializer<?> existingSerializer)
  throws JsonMappingException
{
  final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
  if (_neitherNull(intr, prop)) {
    AnnotatedMember m = prop.getMember();
    if (m != null) {
      Object convDef = intr.findSerializationContentConverter(m);
      if (convDef != null) {
        Converter<Object,Object> conv = provider.converterInstance(prop.getMember(), convDef);
        JavaType delegateType = conv.getOutputType(provider.getTypeFactory());
        // [databind#731]: Should skip if nominally java.lang.Object
        if ((existingSerializer == null) && !delegateType.isJavaLangObject()) {
          existingSerializer = provider.findValueSerializer(delegateType);
        }
        return new StdDelegatingSerializer(conv, delegateType, existingSerializer);
      }
    }
  }
  return existingSerializer;
}

/**
 * @since 2.7
 */
protected void visitArrayFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
    JsonSerializer<?> itemSerializer, JavaType itemType)
  throws JsonMappingException
{
  JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
  if (_neitherNull(v2, itemSerializer)) {
    v2.itemsFormat(itemSerializer, itemType);
  }
}

/**
 * Helper method that calls necessary visit method(s) to indicate that the
 * underlying JSON type is JSON Integer number.
 *
 * @since 2.7
 */
protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint,
    NumberType numberType)
  throws JsonMappingException
{
  JsonIntegerFormatVisitor v2 = visitor.expectIntegerFormat(typeHint);
  if (_neitherNull(v2, numberType)) {
    v2.numberType(numberType);
  }
}

/**
 * @deprecated Since 2.9 use {link {@link #findContextualConvertingSerializer} instead
 */
@Deprecated
protected JsonSerializer<?> findConvertingContentSerializer(SerializerProvider provider,
    BeanProperty prop, JsonSerializer<?> existingSerializer)
  throws JsonMappingException
{
  final AnnotationIntrospector intr = provider.getAnnotationIntrospector();
  if (_neitherNull(intr, prop)) {
    AnnotatedMember m = prop.getMember();
    if (m != null) {
      Object convDef = intr.findSerializationContentConverter(m);
      if (convDef != null) {
        Converter<Object,Object> conv = provider.converterInstance(prop.getMember(), convDef);
        JavaType delegateType = conv.getOutputType(provider.getTypeFactory());
        // [databind#731]: Should skip if nominally java.lang.Object
        if ((existingSerializer == null) && !delegateType.isJavaLangObject()) {
          existingSerializer = provider.findValueSerializer(delegateType);
        }
        return new StdDelegatingSerializer(conv, delegateType, existingSerializer);
      }
    }
  }
  return existingSerializer;
}