Trait ligature::QueryTx

pub trait QueryTx {
    fn all_statements(
        &self
    ) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>;
    fn match_statements(
        &self, 
        source: Option<Identifier>, 
        arrow: Option<Identifier>, 
        target: Option<Value>
    ) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>;
    fn match_statements_range(
        &self, 
        source: Option<Identifier>, 
        arrow: Option<Identifier>, 
        target: Range
    ) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>;
    fn statement_for_context(
        &self, 
        context: &Identifier
    ) -> Result<Option<Statement>, LigatureError>;
}

Represents a QueryTx within the context of a Ligature instance and a single Dataset

Required methods

fn all_statements(
    &self
) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>

Returns all Statements in this Dataset.

fn match_statements(
    &self,
    source: Option<Identifier>,
    arrow: Option<Identifier>,
    target: Option<Value>
) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>

Returns all Statements that match the given criteria. If a parameter is None then it matches all, so passing all Nones is the same as calling all_statements.

fn match_statements_range(
    &self,
    source: Option<Identifier>,
    arrow: Option<Identifier>,
    target: Range
) -> Box<dyn Iterator<Item = Result<Statement, LigatureError>>>

Returns all Statements that match the given criteria. If a parameter is None then it matches all.

fn statement_for_context(
    &self,
    context: &Identifier
) -> Result<Option<Statement>, LigatureError>

Returns the Statement for the given context.

Implementors