bool LocalCollectionQuery::
Query( const string &viewName, ExprTree *expr, bool two_way_matching )
{
ViewRegistry::iterator vri;
ViewMembers::iterator vmi;
MatchClassAd mad;
View *view;
ClassAd *ad=0;
const ClassAd *parent;
string key;
bool match;
bool given_classad=false;
if (expr && expr->isClassad(&ad))
{
given_classad = true;
}
parent = NULL;
// get the view to query
if( !collection || ( vri = collection->viewRegistry.find( viewName ) ) ==
collection->viewRegistry.end( ) ) {
return( false );
}
view = vri->second;
if( expr ) {
if (given_classad) {
mad.ReplaceLeftAd(ad);
} else {
// setup evluation environment if a constraint was supplied
parent = expr->GetParentScope( );
if( !( ad=mad.GetLeftAd() ) || !ad->Insert(ATTR_REQUIREMENTS,expr,false ) ) {
expr->SetParentScope( parent );
return( false );
}
}
}
keys.clear( );
// iterate over the view members
for( vmi=view->viewMembers.begin(); vmi!=view->viewMembers.end(); vmi++ ) {
// ... and insert keys into local list in same order
vmi->GetKey( key );
if( expr ) {
// if a constraint was supplied, make sure its satisfied
ad = collection->GetClassAd( key );
mad.ReplaceRightAd( ad );
if( mad.EvaluateAttrBool( "RightMatchesLeft", match ) && match ) {
bool add_key;
if (!given_classad || !two_way_matching) {
add_key = true;
} else if (mad.EvaluateAttrBool( "LeftMatchesRight", match ) && match) {
add_key = true;
} else {
add_key = false;
}
if (add_key) {
keys.push_back( key );
}
}
mad.RemoveRightAd( );
} else {
keys.push_back( key );
}
}
// initialize local iterator
itr = keys.begin( );
// clean up and return
if( expr ) {
if (given_classad) {
mad.RemoveLeftAd();
}
expr->SetParentScope( parent );
ad = mad.GetLeftAd();
if (ad != NULL) {
ad->Remove(ATTR_REQUIREMENTS);
}
}
return( true );
}
