/*
* LiteralValueOfLink.cc
*
* Copyright (C) 2015, 2018 Linas Vepstas
*
* Author: Linas Vepstas <linasvepstas@gmail.com> January 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License v3 as
* published by the Free Software Foundation and including the
* exceptions at http://opencog.org/wiki/Licenses
*
* 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 Affero General Public
* License along with this program; if not, write to:
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <opencog/atomspace/AtomSpace.h>
#include <opencog/atoms/value/VoidValue.h>
#include "LiteralValueOfLink.h"
using namespace opencog;
LiteralValueOfLink::LiteralValueOfLink(const HandleSeq&& oset, Type t)
: ValueOfLink(std::move(oset), t)
{
if (not nameserver().isA(t, LITERAL_VALUE_OF_LINK))
{
const std::string& tname = nameserver().getTypeName(t);
throw InvalidParamException(TRACE_INFO,
"Expecting an LiteralValueOfLink, got %s", tname.c_str());
}
}
// ---------------------------------------------------------------
/// When executed, this will return the value at the indicated key.
ValuePtr LiteralValueOfLink::execute(AtomSpace* as, bool silent)
{
ValuePtr pap(get_literal(as, silent));
if (pap) return pap;
// If we are here, then no Value was found. If there is a
// third Atom, then it specifies a default to use instead.
if (2 < _outgoing.size())
return _outgoing[2];
// Oh no! Nothing was found!
if (silent)
throw SilentException();
throw InvalidParamException(TRACE_INFO,
"No value for %s", to_string().c_str());
return createVoidValue();
}
DEFINE_LINK_FACTORY(LiteralValueOfLink, LITERAL_VALUE_OF_LINK)
/* ===================== END OF FILE ===================== */