Struct DataTypeConstraint 

pub struct DataTypeConstraint { /* private fields */ }

A unified constraint that validates data types and type-related properties.

This constraint replaces individual type constraints and provides a consistent interface for all data type validations.

Examples

use term_guard::constraints::{DataTypeConstraint, DataTypeValidation, NumericValidation};
use term_guard::core::Constraint;

// Check for specific data type
let type_check = DataTypeConstraint::new(
    "user_id",
    DataTypeValidation::SpecificType("Int64".to_string())
);

// Check for non-negative values
let non_negative = DataTypeConstraint::new(
    "amount",
    DataTypeValidation::Numeric(NumericValidation::NonNegative)
);

// Check type consistency
let consistency = DataTypeConstraint::new(
    "mixed_column",
    DataTypeValidation::Consistency { threshold: 0.95 }
);

Implementations

impl DataTypeConstraint

pub fn new( column: impl Into<String>, validation: DataTypeValidation, ) -> Result<Self>

Creates a new unified data type constraint.

Arguments

• column - The column to validate
• validation - The type of validation to perform

Errors

Returns an error if the column name is invalid.

pub fn non_negative(column: impl Into<String>) -> Result<Self>

Convenience constructor for non-negative constraint.

pub fn type_consistency( column: impl Into<String>, threshold: f64, ) -> Result<Self>

Convenience constructor for type consistency constraint.

pub fn specific_type( column: impl Into<String>, data_type: impl Into<String>, ) -> Result<Self>

Convenience constructor for specific type constraint.

Trait Implementations

impl Clone for DataTypeConstraint

fn clone(&self) -> DataTypeConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Constraint for DataTypeConstraint

fn evaluate<'life0, 'life1, 'async_trait>( &'life0 self, ctx: &'life1 SessionContext, ) -> Pin<Box<dyn Future<Output = Result<ConstraintResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Evaluates the constraint against the data in the session context.

fn name(&self) -> &str

Returns the name of the constraint.

fn metadata(&self) -> ConstraintMetadata

Returns the metadata associated with this constraint.

fn column(&self) -> Option<&str>

Returns the column this constraint operates on (if single-column).

fn description(&self) -> Option<&str>

Returns a description of what this constraint validates.

impl Debug for DataTypeConstraint

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

Formats the value using the given formatter.