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querying for specific objects (automatically pick target type)

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This commit is contained in:
Fischlurch 2010-06-19 08:47:28 +02:00
parent 7c4d57b408
commit 5e104b633a
3 changed files with 69 additions and 6 deletions
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8
src/proc/mobject/session/query-focus.hpp
View file

@ -114,13 +114,13 @@ namespace session {
* Implemented by copying the scope at
* leaf position of the current focus path
*/
QueryFocus::operator Scope() const
inline QueryFocus::operator Scope() const
{
return currPath().getLeaf();
}
/**@note returning a copy */
ScopePath
inline ScopePath
QueryFocus::currentPath() const
{
return currPath();
@ -131,7 +131,7 @@ namespace session {
* within \em current focus. Resolution is
* delegated to the \em current session */
template<class MO>
typename ScopeQuery<MO>::iterator
inline typename ScopeQuery<MO>::iterator
QueryFocus::query() const
{
ScopeLocator::instance().query<MO> (*this);
@ -142,7 +142,7 @@ namespace session {
* as immediate Child within \em current focus.
* Resolution through \em current session */
template<class MO>
typename ScopeQuery<MO>::iterator
inline typename ScopeQuery<MO>::iterator
QueryFocus::explore() const
{
ScopeLocator::instance().explore<MO> (*this);

63
src/proc/mobject/session/specific-contents-query.hpp
View file

@ -107,5 +107,68 @@ namespace session {
};
namespace { // type matching helper
template<class PRED>
struct _PickResult;
template<class MO>
struct _PickResult<function<bool(Placement<MO> const&)> >
{
typedef MO Type;
typedef SpecificContentsQuery<MO> FilterQuery;
typedef typename ScopeQuery<MO>::Iterator Iterator;
};
template<class MO>
struct _PickResult<bool(&)(Placement<MO> const&)>
{
typedef MO Type;
typedef SpecificContentsQuery<MO> FilterQuery;
typedef typename ScopeQuery<MO>::Iterator Iterator;
};
template<class MO>
struct _PickResult<bool(*)(Placement<MO> const&)>
{
typedef MO Type;
typedef SpecificContentsQuery<MO> FilterQuery;
typedef typename ScopeQuery<MO>::iterator Iterator;
};
}
/** convenience shortcut to issue a SpecialContentsQuery,
* figuring out the actual return/filter type automatically,
* based on the predicate given as parameter
*/
template<typename FUNC>
inline typename _PickResult<FUNC>::FilterQuery
pickAllSuitable(PlacementMO const& scope, FUNC predicate)
{
typedef typename _PickResult<FUNC>::FilterQuery Query;
return Query(scope, predicate);
}
/** convenience shortcut (variant), automatically to build
* and execute a suitable SpecialContentsQuery
* @return iterator yielding placements of the type as
* defined through the parameter of the predicate
*/
template<typename FUNC>
inline typename _PickResult<FUNC>::Iterator
pickAllSuitable(PlacementMO const& scope, FUNC predicate, QueryResolver const& resolver)
{
typedef typename _PickResult<FUNC>::FilterQuery Query;
return Query(scope, predicate ).resolveBy(resolver);
}
}} // namespace mobject::session
#endif

4
tests/components/proc/mobject/session/scope-query-test.cpp
View file

@ -107,8 +107,8 @@ namespace test {
discover (ScopeQuery<TestSubMO1> (scope, CONTENTS) , "contents depth-first, filtered to TestSubMO1");
discover (ScopeQuery<TestSubMO2> (scope, CONTENTS) , "contents depth-first, filtered to TestSubMO2");
discover (SpecificContentsQuery<DummyMO> (scope, filter) , "contents depth-first, custom filtered DummyMO");
// note the filter is typed to accept DummyMO
discover (pickAllSuitable(scope, filter) , "contents depth-first, custom filtered DummyMO");
// note filter is typed to accept DummyMO
ScopeQuery<TestSubMO21> allM021(scope, CONTENTS);
ScopeQuery<TestSubMO21>::iterator specialEl (issue(allM021));
++specialEl; // step in to second solution found...