public ParquetValueReader primitive()

in parquet/src/main/java/org/apache/iceberg/parquet/ParquetAvroValueReaders.java [156:232]
74 lines of code
32 McCabe index (conditional complexity)

    public ParquetValueReader<?> primitive(
        org.apache.iceberg.types.Type.PrimitiveType expected, PrimitiveType primitive) {
      ColumnDescriptor desc = type.getColumnDescription(currentPath());

      boolean isMapKey = fieldNames.contains("key");

      if (primitive.getOriginalType() != null) {
        switch (primitive.getOriginalType()) {
          case ENUM:
          case JSON:
          case UTF8:
            if (isMapKey) {
              return new StringReader(desc);
            }
            return new Utf8Reader(desc);
          case DATE:
          case INT_8:
          case INT_16:
          case INT_32:
          case INT_64:
          case TIME_MICROS:
          case TIMESTAMP_MICROS:
            return new UnboxedReader<>(desc);
          case TIME_MILLIS:
            return new TimeMillisReader(desc);
          case TIMESTAMP_MILLIS:
            return new TimestampMillisReader(desc);
          case DECIMAL:
            DecimalLogicalTypeAnnotation decimal =
                (DecimalLogicalTypeAnnotation) primitive.getLogicalTypeAnnotation();
            switch (primitive.getPrimitiveTypeName()) {
              case BINARY:
              case FIXED_LEN_BYTE_ARRAY:
                return new DecimalReader(desc, decimal.getScale());
              case INT64:
                return new LongAsDecimalReader(desc, decimal.getScale());
              case INT32:
                return new IntegerAsDecimalReader(desc, decimal.getScale());
              default:
                throw new UnsupportedOperationException(
                    "Unsupported base type for decimal: " + primitive.getPrimitiveTypeName());
            }
          case BSON:
            return new BytesReader(desc);
          default:
            throw new UnsupportedOperationException(
                "Unsupported logical type: " + primitive.getOriginalType());
        }
      }

      switch (primitive.getPrimitiveTypeName()) {
        case FIXED_LEN_BYTE_ARRAY:
          int fieldId = primitive.getId().intValue();
          Schema avroSchema = AvroSchemaUtil.convert(schema.findType(fieldId));
          return new FixedReader(desc, avroSchema);
        case BINARY:
          return new BytesReader(desc);
        case INT32:
          if (expected != null && expected.typeId() == TypeID.LONG) {
            return new IntAsLongReader(desc);
          } else {
            return new UnboxedReader<>(desc);
          }
        case FLOAT:
          if (expected != null && expected.typeId() == TypeID.DOUBLE) {
            return new FloatAsDoubleReader(desc);
          } else {
            return new UnboxedReader<>(desc);
          }
        case BOOLEAN:
        case INT64:
        case DOUBLE:
          return new UnboxedReader<>(desc);
        default:
          throw new UnsupportedOperationException("Unsupported type: " + primitive);
      }
    }