/**
* This file Copyright (c) 2005-2008 Aptana, Inc. This program is
* dual-licensed under both the Aptana Public License and the GNU General
* Public license. You may elect to use one or the other of these licenses.
*
* This program is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. Redistribution, except as permitted by whichever of
* the GPL or APL you select, is prohibited.
*
* 1. For the GPL license (GPL), you can redistribute and/or modify this
* program under the terms of the GNU General Public License,
* Version 3, as published by the Free Software Foundation. You should
* have received a copy of the GNU General Public License, Version 3 along
* with this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Aptana provides a special exception to allow redistribution of this file
* with certain other free and open source software ("FOSS") code and certain additional terms
* pursuant to Section 7 of the GPL. You may view the exception and these
* terms on the web at http://www.aptana.com/legal/gpl/.
*
* 2. For the Aptana Public License (APL), this program and the
* accompanying materials are made available under the terms of the APL
* v1.0 which accompanies this distribution, and is available at
* http://www.aptana.com/legal/apl/.
*
* You may view the GPL, Aptana's exception and additional terms, and the
* APL in the file titled license.html at the root of the corresponding
* plugin containing this source file.
*
* Any modifications to this file must keep this entire header intact.
*/
package com.aptana.ide.parsing.bnf.nodes;
import com.aptana.ide.io.SourceWriter;
import com.aptana.ide.parsing.bnf.TerminalList;
/**
* @author Kevin Lindsey
*/
public class EmptyNode extends GrammarNodeBase
{
/**
* EmptyNode
*
* @param owningGrammar
* @param name
*/
public EmptyNode(GrammarNode owningGrammar)
{
super(owningGrammar, GrammarNodeTypes.EMPTY, "<empty>"); //$NON-NLS-1$
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj)
{
return (obj instanceof EmptyNode);
}
/**
* @see com.aptana.ide.parsing.bnf.nodes.GrammarNodeBase#getFirst(com.aptana.ide.parsing.bnf.TerminalList)
*/
public void getFirst(TerminalList terminals)
{
terminals.addEpsilon();
}
/**
* @see java.lang.Object#hashCode()
*/
public int hashCode()
{
return 0;
}
/**
* @see com.aptana.ide.parsing.bnf.nodes.GrammarNodeBase#isNullable()
*/
public boolean isNullable()
{
return true;
}
/**
* @see com.aptana.ide.parsing.nodes.ParseNodeBase#getSource(com.aptana.ide.io.SourceWriter)
*/
public void getSource(SourceWriter writer)
{
writer.print("<empty>"); //$NON-NLS-1$
}
}