/*
// $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/extra/CalculatedChildFunDef.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.extra;
import mondrian.olap.*;
import mondrian.olap.fun.FunDefBase;
import mondrian.calc.*;
import mondrian.calc.impl.AbstractMemberCalc;
import mondrian.mdx.ResolvedFunCall;
import java.util.List;
/**
* Definition of the <code>CalculatedChild</code> MDX function.
*
* <p>Syntax:
* <blockquote><code><Member>
* CalculatedChild(<String>)</code></blockquote>
*
* @author bchow
* @version $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/extra/CalculatedChildFunDef.java#1 $
* @since 2006/4/12
*/
public class CalculatedChildFunDef extends FunDefBase {
public static final CalculatedChildFunDef instance =
new CalculatedChildFunDef();
CalculatedChildFunDef() {
super(
"CalculatedChild",
"Returns an existing calculated child member with name <String> from the specified <Member>.",
"mmmS");
}
public Calc compileCall(ResolvedFunCall call, ExpCompiler compiler) {
final MemberCalc memberCalc = compiler.compileMember(call.getArg(0));
final StringCalc stringCalc = compiler.compileString(call.getArg(1));
return new AbstractMemberCalc(
call,
new Calc[] {memberCalc, stringCalc})
{
public Member evaluateMember(Evaluator evaluator) {
Member member = memberCalc.evaluateMember(evaluator);
String name = stringCalc.evaluateString(evaluator);
return getCalculatedChild(member, name, evaluator);
}
};
}
private Member getCalculatedChild(
Member parent,
String childName,
Evaluator evaluator)
{
final SchemaReader schemaReader =
evaluator.getQuery().getSchemaReader(true);
Level childLevel = parent.getLevel().getChildLevel();
if (childLevel == null) {
return parent.getHierarchy().getNullMember();
}
List<Member> calcMemberList =
schemaReader.getCalculatedMembers(childLevel);
for (Member child : calcMemberList) {
// the parent check is required in case there are parallel children
// with the same names
if (child.getParentMember().equals(parent)
&& child.getName().equals(childName))
{
return child;
}
}
return parent.getHierarchy().getNullMember();
}
}
// End CalculatedChildFunDef.java