0

我创建了一个对象 H1BigDecimal，它为 BigDecimal 数据类型提供了默认比例。因此，当用户查询 BigDecimal 时，他们能够确定比例是多少。如果他们愿意，用户还可以选择设置比例值。我的主要问题是如何映射我的 H1BigDecimal 对象以在用户查询 BigDecimal 时返回？

到目前为止，我尝试的是创建自定义标量类型和自定义类型映射器。此方法返回带有值字段的新标量类型（“NewBigDecimal”），但不让用户选择查询值或自行缩放值，因为它不是对象。

所以例如我做查询：

  ExampleEntity_find(pageRequest:{pageNumber:0,pageSize:2}){
    content{    
      exampleBigDecimal     
    }
  }
}

我得到结果

  "data": {
    "ExampleEntity_find": {
      "content": [
        {
          "exampleBigDecimal": {
            "value": "56.0000000000"
          }
        }
      ]
    }
  }
}

我想要的是让用户获得默认值或根据自己的喜好调整值：

exampleBigDecimal{
  value
}

or 

exampleBigDeciaml{
scaledValue(5,Half_down)
}

public class H1BigDecimal{
  private BigDecimal value;

  public H1BigDecimal(BigDecimal value){
    this.value = value;
  }

  @GraphQLQuery
  public String getValue(){
    return this.value.setScale(10, RoundingMode.HALF_UP).toString();

  }

  public BigDecimal asBigDecimalValue(){
    return this.value.setScale(10,RoundingMode.HALF_UP);
  }

  @GraphQLQuery
  public String getScaledValue(int scale, RoundingMode roundingMode){
    return new BigDecimal(this.value.toString()).setScale(scale,roundingMode).toString();
  }
}

public class h1bigDecimalMapper implements TypeMapper {


  private static final GraphQLScalarType newBigDecimal =  GraphQLScalarType.newScalar().name("NewBigDecimal")
      .description("New Big Decimal class").coercing(new Coercing(){

      private boolean isNumberIsh(Object input) {
        return true;
        //return input instanceof Number || input instanceof String;
      }

      private BigDecimal convertImpl(Object input) {
        if (isNumberIsh(input)) {
          try {
            return new BigDecimal(input.toString());
          } catch (NumberFormatException var3) {
            return null;
          }
        } else {
          return null;
        }
      }
        @Override
        public H1BigDecimal serialize(Object o) throws CoercingSerializeException {
          H1BigDecimal result = new H1BigDecimal(convertImpl(o));
          if (result == null) {
            throw new CoercingSerializeException("Expected type 'BigDecimal' but was '" + "'.");
          } else {
            return result;
          }
        }

        @Override
        public H1BigDecimal parseValue(Object o) throws CoercingParseValueException {
          H1BigDecimal result = new H1BigDecimal(convertImpl(o));
          if (result == null) {
            throw new CoercingParseValueException("Expected type 'BigDecimal' but was '" + "'.");
          } else {
            return result;
          }
        }

        @Override
        public H1BigDecimal parseLiteral(Object o) throws CoercingParseLiteralException {
          if (o instanceof StringValue) {
            try {
              return new H1BigDecimal(new BigDecimal(((StringValue)o).getValue()));
            } catch (NumberFormatException var3) {
              throw new CoercingParseLiteralException("Unable to turn AST input into a 'BigDecimal' : '" + o + "'");
            }
          } else if (o instanceof IntValue) {
            return new H1BigDecimal(new BigDecimal(((IntValue)o).getValue()));
          } else if (o instanceof FloatValue) {
            return new H1BigDecimal(((FloatValue)o).getValue());
          } else {
            throw new CoercingParseLiteralException("Expected AST type 'IntValue', 'StringValue' or 'FloatValue' but was '" +  "'.");
          }
        }
      }).build();

  @Override
  public GraphQLOutputType toGraphQLType(AnnotatedType javaType,
      Set<Class<? extends TypeMapper>> mappersToSkip, TypeMappingEnvironment env) {

    return newBigDecimal;
  }

  @Override
  public GraphQLInputType toGraphQLInputType(AnnotatedType javaType,
      Set<Class<? extends TypeMapper>> mappersToSkip, TypeMappingEnvironment env) {
    return newBigDecimal;
  }

  @Override
  public boolean supports(AnnotatedElement element, AnnotatedType type) {
    return ClassUtils.getRawType(type.getType()).equals(BigDecimal.class);
    
  }
}
4

0 回答 0