Enum Query 

pub enum Query {
    None,
    Any,
    Optional,
}

Special query values for entity filtering.

These correspond to PyBIDS’ Query.NONE, Query.ANY, and Query.OPTIONAL sentinel values that modify how entity filters behave beyond simple value matching.

Example

// Find files that have a session entity (any value)
let files = layout.get().query_any("session").collect().unwrap();

// Find files that do NOT have a session entity
let files = layout.get().query_none("session").collect().unwrap();

Variants

None

The entity must not be defined on the file. Files that have any value for this entity are excluded.

Any

The entity must be defined (with any value). Files missing this entity are excluded.

Optional

The entity is optional — no filtering is applied regardless of whether the entity is present or absent.

Trait Implementations

impl Clone for Query

fn clone(&self) -> Query

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Query

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

Formats the value using the given formatter.

impl Display for Query

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

Formats the value using the given formatter.

impl PartialEq for Query

fn eq(&self, other: &Query) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Query

impl StructuralPartialEq for Query