/*
// $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/NamedSetCurrentFunDef.java#1 $
// This software is subject to the terms of the Eclipse Public License v1.0
// Agreement, available at the following URL:
// http://www.eclipse.org/legal/epl-v10.html.
// Copyright (C) 2006-2009 Julian Hyde
// All Rights Reserved.
// You must accept the terms of that agreement to use this software.
*/
package mondrian.olap.fun;
import mondrian.calc.Calc;
import mondrian.calc.ExpCompiler;
import mondrian.calc.impl.AbstractMemberCalc;
import mondrian.calc.impl.AbstractTupleCalc;
import mondrian.mdx.ResolvedFunCall;
import mondrian.mdx.NamedSetExpr;
import mondrian.olap.*;
import mondrian.olap.type.SetType;
import mondrian.olap.type.Type;
import mondrian.olap.type.MemberType;
import mondrian.resource.MondrianResource;
/**
* Definition of the <code><Named Set>.Current</code> MDX
* builtin function.
*
* @author jhyde
* @version $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/NamedSetCurrentFunDef.java#1 $
* @since Oct 19, 2008
*/
public class NamedSetCurrentFunDef extends FunDefBase {
static final NamedSetCurrentFunDef instance =
new NamedSetCurrentFunDef();
private NamedSetCurrentFunDef() {
super(
"Current",
"Returns the current member or tuple of a named set.",
"ptx");
}
public Exp createCall(Validator validator, Exp[] args) {
assert args.length == 1;
final Exp arg0 = args[0];
if (!(arg0 instanceof NamedSetExpr)) {
throw MondrianResource.instance().NotANamedSet.ex();
}
return super.createCall(validator, args);
}
public Calc compileCall(ResolvedFunCall call, ExpCompiler compiler) {
final Exp arg0 = call.getArg(0);
assert arg0 instanceof NamedSetExpr : "checked this in createCall";
final NamedSetExpr namedSetExpr = (NamedSetExpr) arg0;
if (((SetType) arg0.getType()).getArity() == 1) {
return new AbstractMemberCalc(call, new Calc[0]) {
public Member evaluateMember(Evaluator evaluator) {
return namedSetExpr.getEval(evaluator).currentMember();
}
};
} else {
return new AbstractTupleCalc(call, new Calc[0]) {
public Member[] evaluateTuple(Evaluator evaluator) {
return namedSetExpr.getEval(evaluator).currentTuple();
}
};
}
}
}
// End NamedSetCurrentFunDef.java