/*
// $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/AncestorFunDef.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.olap.FunDef;
import mondrian.olap.Member;
import mondrian.olap.Evaluator;
import mondrian.olap.Level;
import mondrian.olap.type.Type;
import mondrian.olap.type.LevelType;
import mondrian.calc.*;
import mondrian.calc.impl.AbstractMemberCalc;
import mondrian.mdx.ResolvedFunCall;
/**
* Definition of the <code>Ancestor</code> MDX function.
*
* @author jhyde
* @version $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/AncestorFunDef.java#1 $
* @since Mar 23, 2006
*/
class AncestorFunDef extends FunDefBase {
static final ReflectiveMultiResolver Resolver = new ReflectiveMultiResolver(
"Ancestor",
"Ancestor(<Member>, {<Level>|<Numeric Expression>})",
"Returns the ancestor of a member at a specified level.",
new String[] {"fmml", "fmmn"},
AncestorFunDef.class);
public AncestorFunDef(FunDef dummyFunDef) {
super(dummyFunDef);
}
public Calc compileCall(ResolvedFunCall call, ExpCompiler compiler) {
final MemberCalc memberCalc =
compiler.compileMember(call.getArg(0));
final Type type1 = call.getArg(1).getType();
if (type1 instanceof LevelType) {
final LevelCalc levelCalc =
compiler.compileLevel(call.getArg(1));
return new AbstractMemberCalc(
call, new Calc[] {memberCalc, levelCalc})
{
public Member evaluateMember(Evaluator evaluator) {
Level level = levelCalc.evaluateLevel(evaluator);
Member member = memberCalc.evaluateMember(evaluator);
int distance =
member.getLevel().getDepth() - level.getDepth();
return ancestor(evaluator, member, distance, level);
}
};
} else {
final IntegerCalc distanceCalc =
compiler.compileInteger(call.getArg(1));
return new AbstractMemberCalc(
call, new Calc[] {memberCalc, distanceCalc})
{
public Member evaluateMember(Evaluator evaluator) {
int distance = distanceCalc.evaluateInteger(evaluator);
Member member = memberCalc.evaluateMember(evaluator);
return ancestor(evaluator, member, distance, null);
}
};
}
}
}
// End AncestorFunDef.java