Trait libreda_db::property_storage::WithProperties

pub trait WithProperties {
    type Key: Hash + Eq;

    // Required methods
    fn with_properties<F, R>(&self, f: F) -> R
       where F: FnOnce(Option<&PropertyStore<Self::Key>>) -> R;
    fn with_properties_mut<F, R>(&self, f: F) -> R
       where F: FnOnce(&mut PropertyStore<Self::Key>) -> R;

    // Provided methods
    fn property<Q>(&self, key: &Q) -> Option<PropertyValue>
       where Self::Key: Borrow<Q>,
             Q: Eq + Hash + ?Sized { ... }
    fn property_str<Q>(&self, key: &Q) -> Option<RcString>
       where Self::Key: Borrow<Q>,
             Q: Eq + Hash + ?Sized { ... }
    fn set_property<V: Into<PropertyValue>>(
        &self,
        key: Self::Key,
        value: V
    ) -> Option<PropertyValue> { ... }
}

A trait for associating user defined properties with a type.

Required Associated Types

type Key: Hash + Eq

Property key type.

Required Methods

fn with_properties<F, R>(&self, f: F) -> Rwhere F: FnOnce(Option<&PropertyStore<Self::Key>>) -> R,

Call a function with maybe the property storage as argument.

The property store might not always be initialized. For instance for objects without any defined properties, it will likely be None.

fn with_properties_mut<F, R>(&self, f: F) -> Rwhere F: FnOnce(&mut PropertyStore<Self::Key>) -> R,

Get mutable reference to the property storage.

Provided Methods

fn property<Q>(&self, key: &Q) -> Option<PropertyValue>where Self::Key: Borrow<Q>, Q: Eq + Hash + ?Sized,

Get a property value by the property key.

fn property_str<Q>(&self, key: &Q) -> Option<RcString>where Self::Key: Borrow<Q>, Q: Eq + Hash + ?Sized,

Get a string property value by key. If the property value is not a string None is returned.

fn set_property<V: Into<PropertyValue>>( &self, key: Self::Key, value: V ) -> Option<PropertyValue>

Insert a property. Returns the old property value if there was already a property stored under this key.

Implementors