/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
*/
package org.geotools.arcsde.data.view;
import java.util.Map;
import net.sf.jsqlparser.statement.select.ColumnReference;
import net.sf.jsqlparser.statement.select.OrderByElement;
import net.sf.jsqlparser.statement.select.OrderByVisitor;
import org.geotools.arcsde.session.ISession;
/**
* Qualifies a column reference in an order by clause
*
* @author Gabriel Roldan, Axios Engineering
* @version $Id$
*
*
* @source $URL$
* http://svn.geotools.org/geotools/trunk/gt/modules/plugin/arcsde/datastore/src/main/java
* /org/geotools/arcsde/data/view/OrderByElementQualifier.java $
* @since 2.3.x
*/
public class OrderByElementQualifier implements OrderByVisitor {
private OrderByElement _qualifiedOrderBy;
private ISession session;
private Map<String, Object> tableAliases;
/**
* Creates a new OrderByElementQualifier object.
*
* @param session
*/
private OrderByElementQualifier(ISession session, Map<String, Object> tableAliases) {
this.session = session;
this.tableAliases = tableAliases;
}
public static OrderByElement qualify(ISession session, Map<String, Object> tableAliases,
OrderByElement orderBy) {
if (orderBy == null) {
return null;
}
OrderByElementQualifier qualifier = new OrderByElementQualifier(session, tableAliases);
orderBy.accept(qualifier);
return qualifier._qualifiedOrderBy;
}
public void visit(OrderByElement orderBy) {
OrderByElement qualifiedOrderBy = new OrderByElement();
qualifiedOrderBy.setAsc(orderBy.isAsc());
ColumnReference colRef = orderBy.getColumnReference();
ColumnReference qualifiedColRef = ColumnReferenceQualifier.qualify(session, tableAliases,
colRef);
qualifiedOrderBy.setColumnReference(qualifiedColRef);
this._qualifiedOrderBy = qualifiedOrderBy;
}
}