/*
// $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/NonEmptyCrossJoinFunDef.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) 2005-2009 Julian Hyde and others
// Copyright (C) 2004-2005 SAS Institute, Inc.
// All Rights Reserved.
// You must accept the terms of that agreement to use this software.
//
// sasebb, 16 December, 2004
*/
package mondrian.olap.fun;
import java.util.List;
import java.util.Collections;
import mondrian.olap.*;
import mondrian.calc.*;
import mondrian.calc.impl.AbstractListCalc;
import mondrian.mdx.ResolvedFunCall;
/**
* Definition of the <code>NonEmptyCrossJoin</code> MDX function.
*
* @author jhyde
* @version $Id: //open/mondrian-release/3.2/src/main/mondrian/olap/fun/NonEmptyCrossJoinFunDef.java#1 $
* @since Mar 23, 2006
*/
public class NonEmptyCrossJoinFunDef extends CrossJoinFunDef {
static final ReflectiveMultiResolver Resolver = new ReflectiveMultiResolver(
"NonEmptyCrossJoin",
"NonEmptyCrossJoin(<Set1>, <Set2>)",
"Returns the cross product of two sets, excluding empty tuples and tuples without associated fact table data.",
new String[]{"fxxx"},
NonEmptyCrossJoinFunDef.class);
public NonEmptyCrossJoinFunDef(FunDef dummyFunDef) {
super(dummyFunDef);
}
public Calc compileCall(final ResolvedFunCall call, ExpCompiler compiler) {
final ListCalc listCalc1 = compiler.compileList(call.getArg(0));
final ListCalc listCalc2 = compiler.compileList(call.getArg(1));
return new AbstractListCalc(
call, new Calc[] {listCalc1, listCalc2}, false)
{
public List evaluateList(Evaluator evaluator) {
SchemaReader schemaReader = evaluator.getSchemaReader();
// evaluate the arguments in non empty mode
evaluator = evaluator.push(true);
NativeEvaluator nativeEvaluator =
schemaReader.getNativeSetEvaluator(
call.getFunDef(), call.getArgs(), evaluator, this);
if (nativeEvaluator != null) {
return (List) nativeEvaluator.execute(ResultStyle.LIST);
}
final List list1 = listCalc1.evaluateList(evaluator);
if (list1.isEmpty()) {
return Collections.EMPTY_LIST;
}
final List list2 = listCalc2.evaluateList(evaluator);
List<Member[]> result = crossJoin(list1, list2);
// remove any remaining empty crossings from the result
result = nonEmptyList(evaluator, result, call);
return result;
}
public boolean dependsOn(Hierarchy hierarchy) {
if (super.dependsOn(hierarchy)) {
return true;
}
// Member calculations generate members, which mask the actual
// expression from the inherited context.
if (listCalc1.getType().usesHierarchy(hierarchy, true)) {
return false;
}
if (listCalc2.getType().usesHierarchy(hierarchy, true)) {
return false;
}
// The implicit value expression, executed to figure out
// whether a given tuple is empty, depends upon all dimensions.
return true;
}
};
}
}
// End NonEmptyCrossJoinFunDef.java