/* Blank.java -- Representation of a RDF blank node. Copyright (C) 2005 The University of Sheffield. This file is part of the CASheW-s editor. The CASheW-s editor 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; either version 2, or (at your option) any later version. The CASheW-s editor 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 The CASheW-s editor; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ package nongnu.cashews.rdf; /** *
* Blank nodes allow different parts of an RDF graph to be connected, * where there are no URIs to use for the intervening nodes. Each blank * node has an identifier, which allows it to be used and referenced * in a triple. *
* * @author Andrew John Hughes (gnu_andrew@member.fsf.org) */ public class Blank implements Subject, RDFObject { /** * The identifier for this blank node. * * @serial the identifier for this node. */ private String id; /** * Constructs aBlank
using the specified identifier.
*
* @param identifier the identifier for this blank node.
*/
public Blank(String identifier)
{
setIdentifier(identifier);
}
/**
* Returns a textual representation of the blank node.
*
* @return a textual representation.
*/
public String toString()
{
return getClass().getName() +
"[id = " +
id +
"]";
}
/**
* Returns a deep copy of this blank node.
*
* @return a clone of the blank node.
*/
public Blank clone()
{
try
{
return (Blank) super.clone();
}
catch (CloneNotSupportedException e)
{
throw new IllegalStateException("Unexpected exception: " + e, e);
}
}
/**
* Sets the identifier used by the blank node to the one specified.
*
* @param identifier the new identifier to use.
*/
public void setIdentifier(String identifier)
{
id = identifier;
}
}