001/*
002// This software is subject to the terms of the Eclipse Public License v1.0
003// Agreement, available at the following URL:
004// http://www.eclipse.org/legal/epl-v10.html.
005// You must accept the terms of that agreement to use this software.
006//
007// Copyright (C) 2006-2007 Pentaho
008// All Rights Reserved.
009*/
010package mondrian.olap.fun;
011
012import mondrian.calc.*;
013import mondrian.calc.impl.AbstractHierarchyCalc;
014import mondrian.mdx.ResolvedFunCall;
015import mondrian.olap.*;
016
017/**
018 * Definition of the <code>&lt;Level&gt;.Hierarchy</code> MDX builtin function.
019 *
020 * @author jhyde
021 * @since Mar 23, 2006
022 */
023public class LevelHierarchyFunDef extends FunDefBase {
024    static final LevelHierarchyFunDef instance = new LevelHierarchyFunDef();
025
026    private LevelHierarchyFunDef() {
027        super("Hierarchy", "Returns a level's hierarchy.", "phl");
028    }
029
030    public Calc compileCall(ResolvedFunCall call, ExpCompiler compiler) {
031        final LevelCalc levelCalc =
032                compiler.compileLevel(call.getArg(0));
033        return new CalcImpl(call, levelCalc);
034    }
035
036    public static class CalcImpl extends AbstractHierarchyCalc {
037        private final LevelCalc levelCalc;
038
039        public CalcImpl(Exp exp, LevelCalc levelCalc) {
040            super(exp, new Calc[] {levelCalc});
041            this.levelCalc = levelCalc;
042        }
043
044        public Hierarchy evaluateHierarchy(Evaluator evaluator) {
045            Level level = levelCalc.evaluateLevel(evaluator);
046            return level.getHierarchy();
047        }
048    }
049}
050
051// End LevelHierarchyFunDef.java