/**
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 Aug 17, 2011
*/
package com.bigdata.rdf.sparql.ast;
import java.util.Iterator;
import java.util.Map;
import com.bigdata.bop.BOp;
/**
* AST node models an ORDER BY clause.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class OrderByNode extends SolutionModifierBase implements
Iterable<OrderByExpr> {
// private final List<OrderByExpr> orderBy = new LinkedList<OrderByExpr>();
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Deep copy constructor.
*/
public OrderByNode(final OrderByNode op) {
super(op);
}
/**
* Shallow copy constructor.
*/
public OrderByNode(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
}
public OrderByNode() {
}
public void addExpr(final OrderByExpr orderBy) {
addArg((BOp) orderBy);
}
public boolean removeOrderBy(final OrderByExpr orderBy) {
return removeArg(orderBy);
}
public int size() {
return arity();
}
public boolean isEmpty() {
return arity() == 0;
}
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public Iterator<OrderByExpr> iterator() {
return (Iterator) argIterator();
}
@Override
public String toString(final int indent) {
final StringBuilder sb = new StringBuilder();
sb.append("\n");
sb.append(indent(indent));
sb.append("ORDER BY");
for (OrderByExpr e : this) {
sb.append(" ");
sb.append(e.toString());
}
return sb.toString();
}
// @Override
// public boolean equals(final Object o) {
//
// if (this == o)
// return true;
//
// if (!(o instanceof OrderByNode))
// return false;
//
// final OrderByNode t = (OrderByNode) o;
//
// if (!orderBy.equals(t.orderBy))
// return false;
//
// return true;
//
// }
}