Struct BlockView 

pub struct BlockView<'a> { /* private fields */ }

A borrowed, read-only view of a Block.

Keys are &str references into the original Block’s key strings. Values are ColumnViews that borrow the underlying array data.

Implementations

impl<'a> BlockView<'a>

pub fn new() -> BlockView<'a>

Creates an empty BlockView.

pub fn insert(&mut self, key: &'a str, col: ColumnView<'a>)

Inserts a column view under the given key.

If the BlockView was empty, nrows is set from the column’s axis-0 length. Subsequent insertions are not validated for consistency (caller is responsible).

pub fn len(&self) -> usize

Number of columns in the view.

pub fn is_empty(&self) -> bool

Returns true if the view contains no columns.

pub fn nrows(&self) -> Option<usize>

Returns the common axis-0 length, or None if empty.

pub fn contains_key(&self, key: &str) -> bool

Returns true if the view contains the specified key.

pub fn get(&self, key: &str) -> Option<&ColumnView<'a>>

Gets an immutable reference to the column view for key if present.

pub fn get_float( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a f64>, Dim<IxDynImpl>>>

Gets a float array view for key if present and of correct type.

pub fn get_int( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a i32>, Dim<IxDynImpl>>>

Gets an int array view for key if present and of correct type.

pub fn get_bool( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a bool>, Dim<IxDynImpl>>>

Gets a bool array view for key if present and of correct type.

pub fn get_uint( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a u32>, Dim<IxDynImpl>>>

Gets a uint array view for key if present and of correct type.

pub fn get_u8( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a u8>, Dim<IxDynImpl>>>

Gets a u8 array view for key if present and of correct type.

pub fn get_string( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&'a String>, Dim<IxDynImpl>>>

Gets a string array view for key if present and of correct type.

pub fn iter(&self) -> impl Iterator<Item = (&&'a str, &ColumnView<'a>)>

Returns an iterator over (&str, &ColumnView).

pub fn keys(&self) -> impl Iterator<Item = &&'a str>

Returns an iterator over column keys.

pub fn values(&self) -> impl Iterator<Item = &ColumnView<'a>>

Returns an iterator over column view references.

pub fn dtype(&self, key: &str) -> Option<DType>

Returns the data type of the column with the given key, if it exists.

pub fn to_owned(&self) -> Block

Creates an owned Block by cloning all viewed data.

Trait Implementations

impl BlockAccess for BlockView<'_>

fn get_float_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&f64>, Dim<IxDynImpl>>>

Gets a float array view for key if present and of correct type.

fn get_int_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&i32>, Dim<IxDynImpl>>>

Gets an int array view for key if present and of correct type.

fn get_bool_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&bool>, Dim<IxDynImpl>>>

Gets a bool array view for key if present and of correct type.

fn get_uint_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&u32>, Dim<IxDynImpl>>>

Gets a uint array view for key if present and of correct type.

fn get_u8_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&u8>, Dim<IxDynImpl>>>

Gets a u8 array view for key if present and of correct type.

fn get_string_view( &self, key: &str, ) -> Option<ArrayBase<ViewRepr<&String>, Dim<IxDynImpl>>>

Gets a string array view for key if present and of correct type.

fn nrows(&self) -> Option<usize>

Returns the common axis-0 length, or None if empty.

fn len(&self) -> usize

Number of columns.

fn is_empty(&self) -> bool

Returns true if there are no columns.

fn contains_key(&self, key: &str) -> bool

Returns true if the block contains the specified key.

fn column_keys(&self) -> Vec<&str>

Returns column keys as a Vec.

fn column_dtype(&self, key: &str) -> Option<DType>

Returns the data type of the column with the given key, if it exists.

fn column_shape(&self, key: &str) -> Option<Vec<usize>>

Returns the shape of the column with the given key, if it exists.

impl Debug for BlockView<'_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'a> Default for BlockView<'a>

fn default() -> BlockView<'a>

Returns the “default value” for a type.

impl<'a> From<&'a Block> for BlockView<'a>

fn from(block: &'a Block) -> BlockView<'a>

Converts to this type from the input type.