Struct Variable

pub struct Variable { /* private fields */ }

A SPARQL query owned variable.

The default string formatter is returning a SPARQL compatible representation:

use oxrdf::{Variable, VariableNameParseError};

assert_eq!("?foo", Variable::new("foo")?.to_string());

Implementations

impl Variable

pub fn new(name: impl Into<String>) -> Result<Variable, VariableNameParseError>

Creates a variable name from a unique identifier.

The variable identifier must be valid according to the SPARQL grammar.

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

Creates a variable name from a unique identifier without validation.

It is the caller’s responsibility to ensure that id is a valid blank node identifier according to the SPARQL grammar.

Variable::new() is a safe version of this constructor and should be used for untrusted data.

pub fn as_str(&self) -> &str

pub fn into_string(self) -> String

pub fn as_ref(&self) -> VariableRef<'_>

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a copy 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<(), Error>

Formats the value using the given formatter.

impl Display for Variable

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

Formats the value using the given formatter.

impl From<Variable> for Expression

fn from(v: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for GraphNamePattern

fn from(var: Variable) -> Self

Converts to this type from the input type.

impl From<Variable> for GroundTermPattern

fn from(var: 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 TermPattern

fn from(var: Variable) -> Self

Converts to this type from the input type.

impl<'a> From<VariableRef<'a>> for Variable

fn from(variable: VariableRef<'a>) -> Variable

Converts to this type from the input type.

impl FromStr for Variable

fn from_str(s: &str) -> Result<Variable, <Variable as FromStr>::Err>

Parses a variable from its SPARQL serialization

use oxrdf::Variable;
use std::str::FromStr;

assert_eq!(Variable::from_str("$foo")?, Variable::new("foo")?);

type Err = TermParseError

The associated error which can be returned from parsing.

impl Hash for Variable

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

where __H: Hasher,

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<VariableRef<'_>> for Variable

fn eq(&self, other: &VariableRef<'_>) -> 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 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<VariableRef<'_>> for Variable

fn partial_cmp(&self, other: &VariableRef<'_>) -> 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 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 Eq for Variable

impl StructuralPartialEq for Variable