opencog-atomspace-storage / opencog / persist / flow / StoreValueOfLink.cc

/*
 * StoreValueOfLink.cc
 *
 * Copyright (C) 2015, 2022 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/persist/api/StorageNode.h>

#include "StoreValueOfLink.h"

using namespace opencog;

StoreValueOfLink::StoreValueOfLink(const HandleSeq&& oset, Type t)
	: ValueOfLink(std::move(oset), t)
{
	if (not nameserver().isA(t, STORE_VALUE_OF_LINK))
	{
		const std::string& tname = nameserver().getTypeName(t);
		throw InvalidParamException(TRACE_INFO,
			"Expecting an StoreValueOfLink, got %s", tname.c_str());
	}
	init();
}

void StoreValueOfLink::init(void)
{
	size_t ary = _outgoing.size();

	if (3 != ary)
		throw SyntaxException(TRACE_INFO, "Expecting three atoms!");

	if (not _outgoing[2]->is_type(STORAGE_NODE))
		throw SyntaxException(TRACE_INFO, "Expecting a StorageNode, got %s",
			_outgoing[2]->to_string().c_str());
}

// ---------------------------------------------------------------

/// Store the Value first, and then return it.
ValuePtr StoreValueOfLink::execute(AtomSpace* as, bool silent)
{
	StorageNodePtr stnp = StorageNodeCast(_outgoing[2]);

	// XXX TODO FIXME ... if either of these are executable, then
	// they need to be executed, first, right? Because that's the
	// usual intent. Else they'd be wrapped in a DontExecLink, right?
	// I'm confused.
	Handle ah(as->add_atom(_outgoing[0]));
	Handle ak(as->add_atom(_outgoing[1]));

	// If the StorageNode is not open for writing, it will
	// either throw, or do something else. Not our decision.
	stnp->store_value(ah, ak);

	return ah->getValue(ak);
}

DEFINE_LINK_FACTORY(StoreValueOfLink, STORE_VALUE_OF_LINK)

/* ===================== END OF FILE ===================== */