/*
 * (C) Copyright 1996- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */

/// @author Baudouin Raoult
/// @author Tiago Quintino
/// @date Sep 2012

#ifndef fdb5_FileStore_H
#define fdb5_FileStore_H


#include "eckit/filesystem/PathName.h"
#include "eckit/filesystem/URI.h"
#include "eckit/io/Length.h"
#include "eckit/io/Offset.h"
#include "eckit/memory/NonCopyable.h"

#include <vector>

namespace eckit {
class Stream;
}

namespace fdb5 {


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


class UriStore : private eckit::NonCopyable {

public: // types

    typedef size_t UriID;

    typedef std::map< UriStore::UriID, eckit::URI >     URIStore;
    typedef std::map< eckit::URI, UriStore::UriID >     IdStore;

public: // methods

    UriStore(const eckit::PathName &directory);
    UriStore(const eckit::PathName &directory, eckit::Stream & );

    ~UriStore();

    /// Inserts the URI in the store
    /// @returns PathID associated to the provided eckit::URI
    UriStore::UriID insert( const eckit::URI &path );

    /// @returns a eckit::URI associated to the provided id
    /// @pre assumes that the eckit::filesystem/PathName.has already been inserted
    eckit::URI get( const UriStore::UriID id ) const;

    /// Return all of the paths used
    std::vector<eckit::URI> paths() const;

    void dump(std::ostream &out, const char* indent) const;

    void encode(eckit::Stream &s) const;

    friend std::ostream &operator<<(std::ostream &s, const UriStore &x) {
        x.print(s);
        return s;
    }

private: // members

    void print( std::ostream &out ) const;

private: // members

    UriStore::UriID    next_;
    bool               readOnly_;

    eckit::PathName    directory_;
    URIStore           paths_;
    IdStore            ids_;


};


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


} // namespace fdb5

#endif
