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#include "ff_external.h"
#include "stringlib.h"
#include <dlfcn.h>
using namespace std;
ExternalFeature::ExternalFeature(const string& param) {
size_t pos = param.find(' ');
string nparam;
string file = param;
if (pos < param.size()) {
nparam = Trim(param.substr(pos + 1));
file = param.substr(0, pos);
}
if (file.size() < 1) {
cerr << "External requires a path to a dynamic library!\n";
abort();
}
lib_handle = dlopen(file.c_str(), RTLD_LAZY);
if (!lib_handle) {
cerr << "dlopen reports: " << dlerror() << endl;
cerr << "Did you provide a full path to the dynamic library?\n";
abort();
}
FeatureFunction* (*fn)(const string&) =
(FeatureFunction* (*)(const string&))(dlsym(lib_handle, "create_ff"));
if (!fn) {
cerr << "dlsym reports: " << dlerror() << endl;
abort();
}
ff_ext = (*fn)(nparam);
SetStateSize(ff_ext->StateSize());
}
ExternalFeature::~ExternalFeature() {
delete ff_ext;
dlclose(lib_handle);
}
void ExternalFeature::PrepareForInput(const SentenceMetadata& smeta) {
ff_ext->PrepareForInput(smeta);
}
void ExternalFeature::FinalTraversalFeatures(const void* context,
SparseVector<double>* features) const {
ff_ext->FinalTraversalFeatures(context, features);
}
void ExternalFeature::TraversalFeaturesImpl(const SentenceMetadata& smeta,
const Hypergraph::Edge& edge,
const std::vector<const void*>& ant_contexts,
FeatureVector* features,
FeatureVector* estimated_features,
void* context) const {
ff_ext->TraversalFeaturesImpl(smeta, edge, ant_contexts, features, estimated_features, context);
}
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