/*
BEGIN LICENSE BLOCK
Copyright 2010-2011, Heiko Mueller, Sam Lindley, James Cheney and
University of Edinburgh
This file is part of Database Wiki.
Database Wiki 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, either version 3 of the License, or
(at your option) any later version.
Database Wiki 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 Database Wiki. If not, see <http://www.gnu.org/licenses/>.
END LICENSE BLOCK
*/
package org.dbwiki.data.query.xaql;
/** XAQL query definition.
*
* @author hmueller
*
*/
import org.dbwiki.data.query.condition.AttributeConditionListing;
import org.dbwiki.data.query.handler.MultiVariableQueryNodeHandler;
import org.dbwiki.data.query.handler.QueryNodeHandler;
import org.dbwiki.data.query.handler.SingleVariableQueryNodeHandler;
import org.dbwiki.data.query.xpath.XPath;
public class XAQLQuery {
/*
* Public Constants
*/
public static final String DefaultResultLabel = "result";
/*
* Private Variables
*/
private FromClause _fromClause;
private SelectClause _selectClause;
private VersionClause _versionClause;
private WhereClause _whereClause;
/*
* Constructors
*/
public XAQLQuery(SelectClause selectClause, FromClause fromClause, VersionClause versionClause, WhereClause whereClause) {
_selectClause = selectClause;
_fromClause = fromClause;
_versionClause = versionClause;
_whereClause = whereClause;
}
/*
* Public Methods
*/
public AttributeConditionListing getConditionListing() {
AttributeConditionListing listing = new AttributeConditionListing();
_fromClause.listConditions(listing);
if (_whereClause != null) {
_whereClause.listConditions(listing);
}
return listing;
}
public QueryNodeHandler getQueryHandler(QueryNodeHandler consumer) {
if (_fromClause.variables().size() > 1) {
return new MultiVariableQueryNodeHandler(_selectClause, _whereClause, _fromClause.rootVariable(), _fromClause.variables(), consumer);
} else {
return new SingleVariableQueryNodeHandler(_selectClause, _whereClause, _fromClause.rootVariable(), consumer);
}
}
public VersionClause getVersionClause() {
return _versionClause;
}
public XPath rootTargetPath() {
return _fromClause.rootVariable().targetPath();
}
}