/* 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 a Blank 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; } }