private static String getVarName(ValueExpr v) {
if (v instanceof Var) {
Var var = (Var) v;
if (!var.isConstant()) {
return var.getName();
}
}
return null;
}
/**
* Provides a string representation of an SP which contains info about whether each component
* (subj, pred, obj) is constant and its data and data type if it is constant.
*
* @param sp - The statement pattern to convert. (not null)
* @return A String representation of the statement pattern that may be used to do triple
* matching.
*/
public static String toStatementPatternString(final StatementPattern sp) {
checkNotNull(sp);
final Var subjVar = sp.getSubjectVar();
String subj = subjVar.getName();
if (subjVar.isConstant()) {
subj = subj + TYPE_DELIM + URI_TYPE;
}
final Var predVar = sp.getPredicateVar();
String pred = predVar.getName();
if (predVar.isConstant()) {
pred = pred + TYPE_DELIM + URI_TYPE;
}
final Var objVar = sp.getObjectVar();
String obj = objVar.getName();
if (objVar.isConstant()) {
final RyaType rt = RdfToRyaConversions.convertValue(objVar.getValue());
obj = obj + TYPE_DELIM + rt.getDataType().stringValue();
}
return subj + DELIM + pred + DELIM + obj;
}