/*******************************************************************************
* Copyright (c) 2009-2013 CWI
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* * Arnold Lankamp - Arnold.Lankamp@cwi.nl
*******************************************************************************/
package org.rascalmpl.parser.gtd.result;
/**
* All nodes in the resulting tree are a subtype of this class.
*/
public abstract class AbstractNode{
public AbstractNode(){
super();
}
/**
* Returns a unique identifier, indicating the type of result node.
*/
public abstract int getTypeIdentifier();
/**
* Checks whether or not this node is an epsilon node.
*/
public boolean isEpsilon(){
return false;
}
/**
* Check whether or not this node is empty (where empty means, that it is
* associated with a zero length location in the input string).
*/
public abstract boolean isEmpty();
/**
* Checks whether or not this node represents a non-terminal separator.
*/
public abstract boolean isNonterminalSeparator();
}