/**
* this nodeToElement is pretty much identical to that of
* graph.query.patternstagecompiler.compile.
*/
private Element nodeToElement(Node X, Mapping map) {
if (X.equals(Query.ANY)) return Element.ANY;
if (X.isVariable()) {
if (map.hasBound(X)) return new Bound(map.indexOf(X));
else {
freeVarCnt++;
return new Free(X);
}
}
return new Fixed(X);
}
protected boolean isArgCheck(Free v, Mapping map) {
int ix = map.lookUp(v.var());
if (ix >= 0) {
v.setIsArg(ix);
isConnected = true;
freeVarCnt -= 1;
return true;
} else return false;
}