/**
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;
/**
* Base class for AST nodes which model an ordered list of value expressions.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
abstract public class ValueExpressionListBaseNode<E extends IValueExpressionNode>
extends SolutionModifierBase implements Iterable<E> {
// private final List<E> exprs = new LinkedList<E>();
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Deep copy constructor.
*/
public ValueExpressionListBaseNode(final ValueExpressionListBaseNode op) {
super(op);
}
/**
* Shallow copy constructor.
*/
public ValueExpressionListBaseNode(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
}
public ValueExpressionListBaseNode() {
super();
}
public void addExpr(final E e) {
if (e == null)
throw new IllegalArgumentException();
addArg((BOp) e);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public Iterator<E> iterator() {
return (Iterator) argIterator();
}
@SuppressWarnings("unchecked")
public E getExpr(final int index) {
return (E) get(index);
}
public int size() {
return arity();
}
public boolean isEmpty() {
return size() == 0;
}
// public boolean equals(final Object o) {
//
// if (this == o)
// return true;
//
// if (!(o instanceof ValueExpressionListBaseNode<?>))
// return false;
//
// final ValueExpressionListBaseNode<? extends IValueExpressionNode> t = (ValueExpressionListBaseNode<?>) o;
//
// if (!exprs.equals(t.exprs))
// return false;
//
// return true;
//
// }
}