> To and from a Query oor to and from a string? The former, to and from a Query (or an object retrieved from a Query).
Thank you Andy. Laurent On Tue, Jul 10, 2012 at 10:26 PM, Andy Seaborne <[email protected]> wrote: > On 10/07/12 15:58, Laurent Pellegrino wrote: >> >> Hello, >> >> I am manipulating Query objects and I was wondering if there is an >> utility class that transforms directly a SortCondition (retrieved >> through Query#getOrderBy()) to its associated Op operator? Same >> question for ElementFilter? > > > Expressions don't need translation - the AST produced by the parser (the E_* > classes) is the algebra form. > > See > > AlgebraGenerator.compileModifiers > > >> Is there something similar to Transformers (provided for algebra >> transformation) but for Elements? > > > There is a visitor pattern but not a transformation pattern on top of that. > > >> >> Finally, is there a class that can serialize/deserialize SortCondition >> and ElementFilter objects? > > > >> Otherwise, if I switch to the algebra, is >> there a class that can serialize/deserialize any Op? > > > To and from a Query oor to and from a string? > > == serialize/dersialize an Op > as an algebra syntax: > > SSE.write > SSE.parseOp > > > == Query > > OpAsQuery does a fairly good job. > > 1/ It is possible to write algebra expressions for which there is no query > 2/ OpAsQuery isn't perfect. > >> >> Kind Regards, > > > >> >> Laurent >> > >
