/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
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* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
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package org.jrdf.query.relation.operation.mem.union;
import org.jrdf.query.relation.EvaluatedRelation;
import org.jrdf.query.relation.operation.DyadicJoin;
import org.jrdf.query.relation.operation.Union;
/**
* A full minimum union outer join is the result of a left minimum union outer join unioned with relation 2.
*/
public class MinimumUnionFullOuterJoinImpl implements DyadicJoin {
private final MinimumUnionLeftOuterJoin leftOuterJoin;
private final Union union;
public MinimumUnionFullOuterJoinImpl(MinimumUnionLeftOuterJoin newLeftOuterJoin, Union newMinimumUnion) {
this.leftOuterJoin = newLeftOuterJoin;
this.union = newMinimumUnion;
}
// TODO (AN) Add tuple subsumption i.e. go through the results and remove the results for a given attribute binding
// that have null values. Or add it to a new time of join. Or replace this with minimum union and tuple
// subsumption.
public EvaluatedRelation join(EvaluatedRelation relation1, EvaluatedRelation relation2) {
EvaluatedRelation minUnionResult = leftOuterJoin.join(relation1, relation2);
return union.union(minUnionResult, relation2);
}
}