Struct vega_lite_4::DataFormatBuilder

pub struct DataFormatBuilder { /* fields omitted */ }

Builder for DataFormat.

Implementations

impl DataFormatBuilder

pub fn parse<VALUE: Into<RemovableValue<HashMap<String, Option<String>>>>>(
    &mut self,
    value: VALUE
) -> &mut Self

If set to null, disable type inference based on the spec and only use type inference based on the data. Alternatively, a parsing directive object can be provided for explicit data types. Each property of the object corresponds to a field name, and the value to the desired data type (one of "number", "boolean", "date", or null (do not parse the field)). For example, "parse": {"modified_on": "date"} parses the modified_on field in each input record a Date value.

For "date", we parse data based using Javascript's Date.parse(). For Specific date formats can be provided (e.g., {foo: "date:'%m%d%Y'"}), using the d3-time-format syntax. UTC date format parsing is supported similarly (e.g., {foo: "utc:'%m%d%Y'"}). See more about UTC time

pub fn data_format_type<VALUE: Into<DataFormatType>>(
    &mut self,
    value: VALUE
) -> &mut Self

Type of input data: "json", "csv", "tsv", "dsv".

Default value: The default format type is determined by the extension of the file URL. If no extension is detected, "json" will be used by default.

pub fn delimiter<VALUE: Into<String>>(&mut self, value: VALUE) -> &mut Self

The delimiter between records. The delimiter must be a single character (i.e., a single 16-bit code unit); so, ASCII delimiters are fine, but emoji delimiters are not.

pub fn property<VALUE: Into<String>>(&mut self, value: VALUE) -> &mut Self

The JSON property containing the desired data. This parameter can be used when the loaded JSON file may have surrounding structure or meta-data. For example "property": "values.features" is equivalent to retrieving json.values.features from the loaded JSON object.

pub fn feature<VALUE: Into<String>>(&mut self, value: VALUE) -> &mut Self

The name of the TopoJSON object set to convert to a GeoJSON feature collection. For example, in a map of the world, there may be an object set named "countries". Using the feature property, we can extract this set and generate a GeoJSON feature object for each country.

pub fn mesh<VALUE: Into<String>>(&mut self, value: VALUE) -> &mut Self

The name of the TopoJSON object set to convert to mesh. Similar to the feature option, mesh extracts a named TopoJSON object set. Unlike the feature option, the corresponding geo data is returned as a single, unified mesh instance, not as individual GeoJSON features. Extracting a mesh is useful for more efficiently drawing borders or other geographic elements that you do not need to associate with specific regions such as individual countries, states or counties.

pub fn build(&self) -> Result<DataFormat, String>

Builds a new DataFormat.

Errors

If a required field has not been initialized.

Trait Implementations

impl Clone for DataFormatBuilder

pub fn clone(&self) -> DataFormatBuilder

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for DataFormatBuilder

pub fn default() -> DataFormatBuilder

Returns the "default value" for a type.