/**
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.IValueExpression;
import com.bigdata.rdf.internal.constraints.RegexBOp;
import com.bigdata.rdf.sparql.ast.ASTBase;
import com.bigdata.rdf.sparql.ast.FilterNode;
import com.bigdata.rdf.sparql.ast.IValueExpressionNode;
import com.bigdata.rdf.sparql.ast.QueryHints;
import com.bigdata.rdf.sparql.ast.QueryRoot;
import com.bigdata.rdf.sparql.ast.eval.AST2BOpContext;
/**
* {@link https://jira.blazegraph.com/browse/BLZG-1780}
*
* {@see https://www.w3.org/TR/sparql11-query/#func-regex}
*
* {@see https://www.w3.org/TR/sparql11-query/#restrictString}
*
* By default, regex is only applied to Literal String values. Enabling this
* query hint will attempt to autoconvert non-String literals into their
* string value. This is the equivalent of always using the str(...) function.
*
*/
final class RegexMatchNonStringHint extends AbstractBooleanQueryHint {
protected RegexMatchNonStringHint() {
super(QueryHints.REGEX_MATCH_NON_STRING, QueryHints.DEFAULT_REGEX_MATCH_NON_STRING);
}
@Override
public void handle(final AST2BOpContext context, final QueryRoot queryRoot,
final QueryHintScope scope, final ASTBase op, final Boolean value) {
if (op instanceof FilterNode) {
final IValueExpressionNode n = ((FilterNode) op)
.getValueExpressionNode();
assert(n != null);
@SuppressWarnings("rawtypes")
final IValueExpression n2 = n.getValueExpression();
if (n2 != null && n2 instanceof RegexBOp) {
((RegexBOp)n2).setMatchNonString(value);
}
}
}
}