/*
* 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.
* You must accept the terms of that agreement to use this software.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package mondrian.olap.fun;
import mondrian.calc.*;
import mondrian.calc.impl.AbstractStringCalc;
import mondrian.mdx.ResolvedFunCall;
import mondrian.olap.Evaluator;
import mondrian.olap.Member;
import mondrian.olap.type.TypeUtil;
/**
* Definition of the <code>TupleToStr</code> MDX function.
*
* <p>Syntax:
* <blockquote><code>
* TupleToStr(<Tuple>)
* </code></blockquote>
*
* @author jhyde
* @since Aug 3, 2006
*/
class TupleToStrFunDef extends FunDefBase {
static final TupleToStrFunDef instance = new TupleToStrFunDef();
private TupleToStrFunDef() {
super("TupleToStr", "Constructs a string from a tuple.", "fSt");
}
public Calc compileCall(ResolvedFunCall call, ExpCompiler compiler) {
if (TypeUtil.couldBeMember(call.getArg(0).getType())) {
final MemberCalc memberCalc =
compiler.compileMember(call.getArg(0));
return new AbstractStringCalc(call, new Calc[] {memberCalc}) {
public String evaluateString(Evaluator evaluator) {
final Member member =
memberCalc.evaluateMember(evaluator);
if (member.isNull()) {
return "";
}
StringBuilder buf = new StringBuilder();
buf.append(member.getUniqueName());
return buf.toString();
}
};
} else {
final TupleCalc tupleCalc =
compiler.compileTuple(call.getArg(0));
return new AbstractStringCalc(call, new Calc[] {tupleCalc}) {
public String evaluateString(Evaluator evaluator) {
final Member[] members =
tupleCalc.evaluateTuple(evaluator);
if (members == null) {
return "";
}
StringBuilder buf = new StringBuilder();
SetToStrFunDef.appendTuple(buf, members);
return buf.toString();
}
};
}
}
}
// End TupleToStrFunDef.java