/**
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.rdf.sparql.ast.ASTBase;
import com.bigdata.rdf.sparql.ast.DescribeModeEnum;
import com.bigdata.rdf.sparql.ast.ProjectionNode;
import com.bigdata.rdf.sparql.ast.QueryHints;
import com.bigdata.rdf.sparql.ast.QueryRoot;
import com.bigdata.rdf.sparql.ast.eval.AST2BOpContext;
/**
* Query hint used to indicate the {@link DescribeMode} that will be used to
* evaluate a DESCRIBE query.
*
* @see <a href="https://sourceforge.net/apps/trac/bigdata/ticket/578"> Concise
* Bounded Description </a>
*
* @see QueryHints#DESCRIBE_MODE
*/
final class DescribeModeHint extends AbstractQueryHint<DescribeModeEnum> {
protected DescribeModeHint() {
super(QueryHints.DESCRIBE_MODE, QueryHints.DEFAULT_DESCRIBE_MODE);
}
@Override
public void handle(final AST2BOpContext context,
final QueryRoot queryRoot,
final QueryHintScope scope, final ASTBase op,
final DescribeModeEnum value) {
if (op instanceof ProjectionNode) {
//_setQueryHint(context, scope, op, getName(), value);
((ProjectionNode) op).setDescribeMode(value);
return;
}
// throw new QueryHintException(scope, op, getName(), value);
}
@Override
public DescribeModeEnum validate(String value) {
return DescribeModeEnum.valueOf(value);
}
}