/**
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 June 29, 2015.
*/
package com.bigdata.rdf.sparql.ast.hints;
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;
import com.bigdata.rdf.sparql.ast.optimizers.ASTFilterNormalizationOptimizer;
/**
* Query hint to enable/disable normalization and decomposition of complex
* FILTER expressions with {@link QueryHints#NORMALIZE_FILTER_EXPRESSIONS}.
* The hint applies to groups or subgroups.
* <p>
* Note: This sets an AST annotation which is interpreted by the
* {@link ASTFilterNormalizationOptimizer}.
*
* @author <a href="mailto:ms@metaphacts.com">Michael Schmidt</a>
* @version $Id$
*/
final class NormalizeFilterExpressionHint extends AbstractBooleanQueryHint {
protected NormalizeFilterExpressionHint() {
super(QueryHints.NORMALIZE_FILTER_EXPRESSIONS, null/* default */);
}
@Override
public void handle(final AST2BOpContext context,
final QueryRoot queryRoot,
final QueryHintScope scope, final ASTBase op, final Boolean value) {
switch (scope) {
case Group:
case GroupAndSubGroups:
case Query:
case SubQuery:
if (op instanceof JoinGroupNode) {
_setAnnotation(context, scope, op, getName(), value);
}
return;
default:
break;
}
throw new QueryHintException(scope, op, getName(), value);
}
}