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#include <pch.hpp>
#include "../variables.h"
#include <safeMapFind.h>
#include "../logger.h"
#include "../rowProcessor.h"
#include "../rowSet.h"
#include "../scriptLoader.h"
#include "../scriptStorage.h"
/// Variable implementation that looks up it's value in a map of key(s)/value pairs
class VariableLookup : public VariableImplDyn, public RowProcessor {
private:
typedef std::vector<VariableType> Key;
typedef std::map<Key, VariableType> Map;
public:
class NotFound : public std::runtime_error {
public:
NotFound(const Key & k) :
std::runtime_error(mklist(k)) {
}
static std::string mklist(const Key & k) {
std::string l("(");
for (Key::const_iterator kp = k.begin(); kp != k.end(); ++kp) {
if (kp != k.begin()) l += ", ";
l += kp->operator const std::string &();
}
l += ")";
return l;
}
};
VariableLookup(ScriptNodePtr e) :
VariableImplDyn(e),
RowProcessor(e),
name(e->value("name", NULL).as<Glib::ustring>())
{
e->script->loader.addLoadTarget(e, Storer::into<ElementLoader>(&rowSets));
}
VariableType value(ExecContext * ec) const
{
if (map.empty()) {
fillCache(ec);
}
Key k;
k.reserve(parameters.size());
for (const Parameters::value_type & p : parameters) {
k.push_back(p.second(ec));
}
return AdHoc::safeMapLookup<NotFound>(map, k);
}
private:
void fillCache(ExecContext * ec) const
{
for (const RowSets::value_type & rs : rowSets) {
rs->execute(filter, boost::bind(&VariableLookup::rowReady, this, _1, ec), ec);
}
Logger()->messagef(LOG_DEBUG, "%s: %s has filled cached with %zu items",
__PRETTY_FUNCTION__, name.c_str(), map.size());
}
void rowReady(const RowState * rs, ExecContext * ec) const
{
Key k;
for (const Parameters::value_type & p : parameters) {
k.push_back(rs->getCurrentValue(ec, p.first));
}
map[k] = rs->getCurrentValue(ec, name);
}
mutable Map map;
typedef ANONSTORAGEOF(RowSet) RowSets;
RowSets rowSets;
const Glib::ustring name;
};
DECLARE_COMPONENT_LOADER("lookup", VariableLookup, VariableLoader);
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