Struct Variable 

pub struct Variable { /* private fields */ }

A SPARQL variable

Variables are used in SPARQL queries and updates to represent unknown values.

Implementations

impl Variable

pub fn new(name: impl Into<String>) -> Result<Self, OxirsError>

Creates a new variable with the given name

Arguments

• name - The variable name (with or without ? or $ prefix)

Errors

Returns an error if the name format is invalid according to SPARQL 1.1 specification

pub fn new_unchecked(name: impl Into<String>) -> Self

Creates a new variable without validation

Safety

The caller must ensure the name is valid according to SPARQL rules

pub fn name(&self) -> &str

Returns the variable name (without prefix)

pub fn as_str(&self) -> &str

Returns the variable name as a string slice (without prefix)

pub fn with_prefix(&self) -> String

Returns the variable name with ? prefix for SPARQL syntax

impl Variable

pub fn fmt_sse(&self, f: &mut impl Write) -> Result

Formats using the SPARQL S-Expression syntax

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Variable

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Variable

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Variable

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

Formats the value using the given formatter.

impl From<Variable> for GraphName

fn from(variable: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for NamedNodePattern

fn from(var: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for Object

fn from(variable: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for Predicate

fn from(variable: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for Subject

fn from(variable: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for Term

fn from(variable: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for TermPattern

fn from(v: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for TermPattern

fn from(v: Variable) -> Self

Converts to this type from the input type.

impl Hash for Variable

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Variable

fn cmp(&self, other: &Variable) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Variable

fn eq(&self, other: &Variable) -> 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 PartialOrd for Variable

fn partial_cmp(&self, other: &Variable) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl RdfTerm for Variable

fn as_str(&self) -> &str

Returns the string representation of this term

fn is_variable(&self) -> bool

Returns true if this is a variable

fn is_named_node(&self) -> bool

Returns true if this is a named node (IRI)

fn is_blank_node(&self) -> bool

Returns true if this is a blank node

fn is_literal(&self) -> bool

Returns true if this is a literal

fn is_quoted_triple(&self) -> bool

Returns true if this is a quoted triple (RDF-star)

impl Serialize for Variable

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Variable

impl StructuralPartialEq for Variable