${var} variable substitution

${age},${name} Given a context map<string,string> context replaces variables with contexts
Private Static FinalPattern Var_pattern =Pattern.compile ("\\$\\{[^\\}\\$\u0020]+\\}"); Private Static Final intMax_subst = 20; Private StaticString Substitutevars (String expr,map<string,string>Parammap) {            if(Expr = =NULL) {              return NULL; } Matcher Match= Var_pattern.matcher (""); String Eval=expr;  for(ints=0; s<max_subst; s++) {match.reset (eval); if(!Match.find ()) {                returneval; } String var=Match.group (); var= Var.substring (2, Var.length ()-1);//Remove ${ .String val =NULL; Try{val=Parammap.get (VAR); } Catch(SecurityException se) {}/*if (val = = null) {val = "AA"; }*/              if(val = =NULL) {                returnEval//return literal ${var}: Var is unbound              }              //Substituteeval = eval.substring (0, Match.start ()) +val+eval.substring (Match.end ()); }            Throw NewIllegalStateException ("Variable substitution depth too large:" + Max_subst + " " +expr); }

${var} variable substitution