annotate vamp-support/RdfTypes.h @ 223:a29ce4af17bc

More filling in the RDF type loading code

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Piper C++

    An API for audio analysis and feature extraction plugins.

    Centre for Digital Music, Queen Mary, University of London.
    Copyright 2006-2017 Chris Cannam and QMUL.
  
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*/

#ifndef PIPER_RDF_TYPES_H
#define PIPER_RDF_TYPES_H

#include "StaticOutputDescriptor.h"

#include <vamp-hostsdk/PluginLoader.h>

#include <sord/sord.h>

#include <mutex>

namespace piper_vamp {

class RdfTypes
{
public:
    RdfTypes() :
        m_world(sord_world_new())
    {}

    ~RdfTypes() {
        sord_world_free(m_world);
    }
    
    StaticOutputInfo loadStaticOutputInfo(Vamp::HostExt::PluginLoader::PluginKey
                                          pluginKey) {

        StaticOutputInfo info;
        SordModel *model = sord_new(m_world, SORD_SPO|SORD_OPS|SORD_POS, false);
        if (loadRdf(model, candidateRdfFilesFor(pluginKey))) {
            // we want to find a graph like
            // :plugin vamp:output :output1
            // :plugin vamp:output :output2
            // :plugin vamp:output :output3
            // :output1 vamp:computes_event_type :event
            // :output2 vamp:computes_feature :feature
            // :output3 vamp:computes_signal_type :signal
        }
        sord_free(model);
        return info;
    }

private:
    SordWorld *m_world;

    bool loadRdf(SordModel *targetModel, std::vector<std::string> filenames) {
        for (auto f: filenames) {
            if (loadRdfFile(targetModel, f)) {
                return true;
            }
        }
        return false;
    }

    bool loadRdfFile(SordModel *targetModel, std::string filename) {
        std::string base = "file://" + filename;
        SerdURI bu;
        if (serd_uri_parse((const uint8_t *)base.c_str(), &bu) !=
            SERD_SUCCESS) {
            std::cerr << "Failed to parse base URI " << base << std::endl;
            return false;
        }
        SerdNode bn = serd_node_from_string(SERD_URI,
                                            (const uint8_t *)base.c_str());
        SerdEnv *env = serd_env_new(&bn);
        SerdReader *reader = sord_new_reader(targetModel, env, SERD_TURTLE, 0);
        SerdStatus rv = serd_reader_read_file
            (reader, (const uint8_t *)filename.c_str());
        bool success = (rv == SERD_SUCCESS);
        if (!success) {
            std::cerr << "Failed to import RDF from " << filename << std::endl;
        } else {
            std::cerr << "Imported RDF from " << filename << std::endl;
        }
        serd_reader_free(reader);
        serd_env_free(env);
        return success;
    }
    
    std::vector<std::string> candidateRdfFilesFor(Vamp::HostExt::
                                                  PluginLoader::PluginKey key) {

        std::string library = Vamp::HostExt::PluginLoader::getInstance()->
            getLibraryPathForPlugin(key);
	
        auto li = library.rfind('.');
        if (li == std::string::npos) return {};
        auto withoutSuffix = library.substr(0, li);

        std::vector<std::string> suffixes { "ttl", "TTL", "n3", "N3" };
        std::vector<std::string> candidates;

        for (auto suffix : suffixes) {
            candidates.push_back(withoutSuffix + "." + suffix);
        }

        return candidates;
    }
};

}

#endif