/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Aug 17, 2011
*/
package com.bigdata.rdf.sparql.ast;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import com.bigdata.bop.BOp;
import com.bigdata.bop.BOpUtility;
import com.bigdata.bop.IValueExpression;
import com.bigdata.bop.IVariable;
import com.bigdata.rdf.internal.IV;
/**
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
@SuppressWarnings("rawtypes")
public abstract class GroupMemberValueExpressionNodeBase extends
GroupMemberNodeBase implements IValueExpressionMetadata {
// interface Annotations extends GroupMemberNodeBase.Annotations {
//
// String VALUE_EXPR = "valueExpr";
//
// }
/**
*
*/
private static final long serialVersionUID = 1L;
public GroupMemberValueExpressionNodeBase() {
}
public GroupMemberValueExpressionNodeBase(BOp[] args,
Map<String, Object> anns) {
super(args, anns);
}
public GroupMemberValueExpressionNodeBase(
GroupMemberValueExpressionNodeBase op) {
super(op);
}
abstract public IValueExpressionNode getValueExpressionNode();
abstract IValueExpression<? extends IV> getValueExpression();
/**
* Return the {@link IValueExpression}.
*
* @return The {@link IValueExpression} and never <code>null</code>.
*
* @throws IllegalStateException
* if the {@link IValueExpression} is not set on this node.
*/
public final IValueExpression<? extends IV> getRequiredValueExpression() {
final IValueExpression<? extends IV> valueExpr = getValueExpression();
if (valueExpr == null)
throw new IllegalStateException("ValueExpression not set: " + this);
return valueExpr;
}
@Override
public Set<IVariable<?>> getConsumedVars() {
final Set<IVariable<?>> consumedVars = new LinkedHashSet<IVariable<?>>();
// collect variables from required value expression
final Iterator<IVariable<?>> it =
BOpUtility.getSpannedVariables(getRequiredValueExpression());
while (it.hasNext()) {
consumedVars.add(it.next());
}
return consumedVars;
}
@Override
public ComputedMaterializationRequirement getMaterializationRequirement() {
final IValueExpression<?> ve = getRequiredValueExpression();
return new ComputedMaterializationRequirement(ve);
}
}