deuterium 0.2.0

Deuterium is a fancy SQL builder for Rust. It's designed to provide a DSL to easily build SQL queries in safe and *typed* way.
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use std::rc::Rc;

use sql::{PredicateToSql};

pub use self::raw::{RawPredicate};
pub use self::is::{IsPredicate, ToIsPredicate};
pub use self::is_null::{IsNullPredicate, ToIsNullPredicate};
pub use self::or::{OrPredicate, ToOrPredicate};
pub use self::and::{AndPredicate, ToAndPredicate};
pub use self::exclude::{ExcludePredicate, ToExcludePredicate};
pub use self::like::{LikePredicate, ToLikePredicate};
pub use self::in_::{
    InPredicate, ToInPredicate
};

pub use self::range::{
    InRangePredicate, ToInRangePredicate,
    InRangeBounds
};

pub use self::inequality::{
    InequalityPredicate, ToInequalityPredicate,
    Inequality
};

pub mod is;
pub mod is_null;
pub mod or;
pub mod in_;
pub mod range;
pub mod and;
pub mod inequality;
pub mod exclude;
pub mod like;
pub mod raw;

pub trait Predicate: PredicateToSql { 

}

pub trait ToAbstractPredicate { 
    fn upcast(&self) -> RcPredicate;
}

impl<T> ToAbstractPredicate for T where T: Predicate + Clone + 'static {
    fn upcast(&self) -> RcPredicate {
        Rc::new(box self.clone() as BoxedPredicate)
    }
}

impl ToOrPredicate for RcPredicate {
    fn or(&self, predicate: RcPredicate) -> RcPredicate {
        OrPredicate{ left: self.clone(), right: predicate }.upcast()
    }
}

impl ToAndPredicate for RcPredicate {
    fn and(&self, predicate: RcPredicate) -> RcPredicate {
        AndPredicate{ left: self.clone(), right: predicate }.upcast()
    }
}

pub type BoxedPredicate = Box<Predicate + 'static>;
pub type RcPredicate = Rc<BoxedPredicate>;