libraries/ostrich/backend/parser/rdf_parser.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef MARMOTTA_RDF_PARSER_H
#define MARMOTTA_RDF_PARSER_H

#include <string>
#include <functional>

#include <raptor2/raptor2.h>
#include <model/rdf_model.h>

namespace marmotta {
namespace parser {

enum Format {
    RDFXML, TURTLE, NTRIPLES, NQUADS, RDFJSON, RDFA, TRIG, GUESS
};

/**
 * Return the format matching the string name passed as argument.
 */
Format FormatFromString(const std::string& name);

/**
 * Return a string representation of the format passed as argument.
 */
std::string FormatToString(Format fmt);

class Parser {
 public:

    Parser(const rdf::URI& baseUri) : Parser(baseUri, Format::GUESS) {};
    Parser(const rdf::URI& baseUri, Format format);

    // TODO: copy and move constructors

    ~Parser();

    void setStatementHandler(std::function<void(const rdf::Statement&)> const &handler) {
        Parser::stmt_handler = handler;
    }

    void setNamespaceHandler(std::function<void(const rdf::Namespace&)> const &handler) {
        Parser::ns_handler = handler;
    }


    void parse(std::istream& in);

 private:
    raptor_parser* parser;
    raptor_world*  world;
    raptor_uri*    base;
    std::string    error;

    std::function<void(const rdf::Statement&)> stmt_handler;
    std::function<void(const rdf::Namespace&)> ns_handler;

    static void raptor_stmt_handler(void* user_data, raptor_statement* statement);
    static void raptor_ns_handler(void* user_data, raptor_namespace *nspace);
    static void raptor_error_handler(void *user_data, raptor_log_message* message);
};

class ParseError : std::exception {
 public:
    ParseError(const char* message) : message(message) { }
    ParseError(std::string &message) : message(message) { }

    const std::string &getMessage() const {
        return message;
    }

 private:
    std::string message;
};
}
}

#endif //MARMOTTA_RDF_PARSER_H