/**
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 Nov 27, 2011
*/
package com.bigdata.rdf.sparql.ast.hints;
import com.bigdata.bop.joinGraph.rto.JGraph;
import com.bigdata.rdf.sparql.ast.ASTBase;
import com.bigdata.rdf.sparql.ast.JoinGroupNode;
import com.bigdata.rdf.sparql.ast.QueryHints;
import com.bigdata.rdf.sparql.ast.QueryRoot;
import com.bigdata.rdf.sparql.ast.eval.AST2BOpContext;
/**
* The query hint governing the choice of the number of initial edges for the
* exploration of join paths in the join graph.
*
* @see JGraph
* @see QueryHints#RTO_NEDGES
*/
final class RTONEdgesQueryHint extends AbstractIntQueryHint {
public RTONEdgesQueryHint() {
super(QueryHints.RTO_NEDGES, QueryHints.DEFAULT_RTO_NEDGES);
}
@Override
public Integer validate(final String value) {
final int i;
try {
i = Integer.parseInt(value);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Not an integer value: hint=" + getName() + ", value=" + value);
}
if (i <= 0)
throw new IllegalArgumentException("Must be positive: hint="
+ getName() + ", value=" + value);
return i;
}
@Override
public void handle(final AST2BOpContext ctx,
final QueryRoot queryRoot,
final QueryHintScope scope,
final ASTBase op, final Integer value) {
switch (scope) {
case Group:
case GroupAndSubGroups:
case Query:
case SubQuery:
if (op instanceof JoinGroupNode) {
_setAnnotation(ctx, scope, op, getName(), value);
}
return;
}
throw new QueryHintException(scope, op, getName(), value);
}
}