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
