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LayoutCursor

vortex_tui::browse::app

Struct LayoutCursor 

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pub struct LayoutCursor { /* private fields */ }
Expand description

A navigable pointer into the layout hierarchy of a Vortex file.

The cursor maintains the current position within the layout tree and provides methods to navigate up and down the hierarchy. It also provides access to layout metadata and segment information at the current position.

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impl LayoutCursor

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pub fn new(footer: Footer, segment_source: Arc<dyn SegmentSource>) -> Self

Create a new cursor pointing at the root layout.

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pub fn new_with_path( footer: Footer, segment_source: Arc<dyn SegmentSource>, path: Vec<usize>, ) -> Self

Create a new cursor at a specific path within the layout tree.

The path is a sequence of child indices to traverse from the root.

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pub fn child(&self, n: usize) -> Self

Create a new cursor pointing at the n-th child of the current layout.

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pub fn parent(&self) -> Self

Create a new cursor pointing at the parent of the current layout.

If already at the root, returns a cursor pointing at the root.

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pub fn flatbuffer_size(&self) -> usize

Get the size of the array flatbuffer for this layout.

§Panics

Panics if the current layout is not a FlatVTable layout.

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pub fn flat_layout_metadata_info(&self) -> String

Get a human-readable description of the flat layout metadata.

§Panics

Panics if the current layout is not a FlatVTable layout.

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pub fn total_size(&self) -> usize

Get the total size in bytes of all segments reachable from this layout.

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pub fn is_stats_table(&self) -> bool

Returns true if the cursor is currently pointing at a statistics table.

A statistics table is the second child of a ZonedVTable layout.

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pub fn dtype(&self) -> &DType

Get the data type of the current layout.

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pub fn layout(&self) -> &LayoutRef

Get a reference to the current layout.

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pub fn segment_spec(&self, id: SegmentId) -> &SegmentSpec

Get the segment specification for a given segment ID.

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