lib: added non-ownership constructors to MultiRecordParser and AllRecordsParser

[barry.git] / src / parser.h

///
/// \file       parser.h
///             Virtual parser wrapper
///

/*
    Copyright (C) 2005-2011, Net Direct Inc. (http://www.netdirect.ca/)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    See the GNU General Public License in the COPYING file at the
    root directory of this project for more details.
*/

#ifndef __BARRY_PARSER_H__
#define __BARRY_PARSER_H__

#include "dll.h"
#include "data.h"
#include "protocol.h"
#include <stdint.h>             // for uint32_t
#include <iosfwd>
#include <map>

// forward declarations
namespace Barry {
        class IConverter;
        class Contact;
        class Message;
        class Calendar;
        class CalendarAll;
        class CallLog;
        class Bookmark;
        class ServiceBook;
        class Memo;
        class Task;
        class PINMessage;
        class SavedMessage;
        class Sms;
        class Folder;
        class Timezone;
        class ContentStore;
}

//
// This macro can be used to automatically generate code for all known
// record types.  Just #undef HANDLE_PARSER, then #define it to whatever
// you need, then use ALL_KNOWN_PARSER_TYPES.  See parser.cc for
// various examples.
//
// These are sorted so their GetDBName()'s will display in alphabetical order.
//
#define ALL_KNOWN_PARSER_TYPES \
        HANDLE_PARSER(Contact) \
        HANDLE_PARSER(Bookmark) \
        HANDLE_PARSER(Calendar) \
        HANDLE_PARSER(CalendarAll) \
        HANDLE_PARSER(ContentStore) \
        HANDLE_PARSER(Folder) \
        HANDLE_PARSER(Memo) \
        HANDLE_PARSER(Message) \
        HANDLE_PARSER(CallLog) \
        HANDLE_PARSER(PINMessage) \
        HANDLE_PARSER(SavedMessage) \
        HANDLE_PARSER(ServiceBook) \
        HANDLE_PARSER(Sms) \
        HANDLE_PARSER(Task) \
        HANDLE_PARSER(Timezone)

namespace Barry {

//
// Parser class
//
/// Base class for the parser hierarchy.
///
/// This class provides the interface that the Controller class uses
/// to pass raw data it reads from the device.  The Controller, along
/// with the Packet class, calls each of the virtual functions below
/// in the same order.
///
/// This class is kept as a pure abstract class, in order to make sure
/// that the compiler will catch any API changes, for code derived
/// from it.
///
class BXEXPORT Parser
{
public:
        Parser() {}
        virtual ~Parser() {}

        /// Called to parse sub fields in the raw data packet.
        virtual void ParseRecord(const DBData &data, const IConverter *ic) = 0;
};


//
// NullParser class
//
/// If in debug mode, this class can be used as a null parser.
/// Call Init() and the protocol will be dumped to stdout and
/// no parsing will be done.
///
/// Do NOT derive your own personal parser classes from this,
/// unless you are perfectly confident that you will catch
/// future API changes on the devel tree without the compiler's
/// help.
///
class BXEXPORT NullParser : public Parser
{
public:
        NullParser() {}
        virtual ~NullParser() {}

        virtual void ParseRecord(const DBData &data, const IConverter *ic) {}
};

//
// HexDumpParser
//
/// Dumps raw hex of the given DBData to the given stream.
///
/// Do NOT derive your own personal parser classes from this,
/// unless you are perfectly confident that you will catch
/// future API changes on the devel tree without the compiler's
/// help.
///
class BXEXPORT HexDumpParser : public Parser
{
        std::ostream &m_os;
        std::string m_last_dbname;

public:
        explicit HexDumpParser(std::ostream &os);

        virtual void ParseRecord(const Barry::DBData &data,
                                 const IConverter *ic);
};

//
// RecordParserBase
//
/// Abstract base class for the following RecordParser template, that exposes
/// some information on the specifics that the record parser can handle.
/// Specifically, it exposes the database name it is able to parse
///
class BXEXPORT RecordParserBase : public Parser
{
public:
        // These functions are always valid, regardless of the
        // state of the parser.
        virtual const char * GetDBName() const = 0;
        virtual uint8_t GetDefaultRecType() const = 0;

        // These functions depend on the parser having just parsed
        // a record successfully.
        virtual bool IsRecordValid() const = 0;
        virtual uint8_t GetRecType() const = 0;
        virtual uint32_t GetUniqueId() const = 0;
        virtual void Dump(std::ostream &os) const = 0;
};


//
// Note: Store classes take parsed Record objects as a functor.
//       Parser classes deal with raw data, while Store classes deal with
//       parsed Record objects.
//

//
// NullStore
//
/// A Storage class for RecordParser<> that does nothing, for the cases
/// where you only want to dump parsed record data to a stream.
///
template <class RecordT>
class NullStore
{
public:
        void operator() (const RecordT &r)
        {
        }
};

//
// DumpStore
//
/// A Storage class for RecordParser<> that dumps the parsed record data
/// to the given stream.
///
template <class RecordT>
class DumpStore
{
        std::ostream &m_os;

public:
        explicit DumpStore(std::ostream &os)
                : m_os(os)
        {
        }

        void operator() (const RecordT &r)
        {
                r.Dump(m_os);
        }
};

//
// ParseDBData
//
/// Contains the proper way to convert a DBData object into a record.
///
template <class RecordT>
void ParseDBData(const DBData &data, RecordT &rec, const IConverter *ic)
{
        // start fresh
        rec = RecordT();

        // parse
        rec.SetIds(data.GetRecType(), data.GetUniqueId());
        size_t offset = data.GetOffset();
        rec.ParseHeader(data.GetData(), offset);
        rec.ParseFields(data.GetData(), offset, ic);
}

//
// RecordParser template class
//
/// Template class for easy creation of specific parser objects.  This template
/// takes the following template arguments:
///
///     - RecordT: One of the record parser classes in record.h
///     - StorageT: A custom storage functor class.  An object of this type
///             will be called as a function with parsed Record as an
///             argument.  This happens on the fly as the data is retrieved
///             from the device over USB, so it should not block forever.
///
/// Example LoadDatabase() call:
///
/// <pre>
/// struct StoreContact
/// {
///     std::vector<Contact> &amp;array;
///     StoreContact(std::vector<Contact> &amp;a) : array(a) {}
///     void operator() (const Contact &amp;c)
///     {
///         array.push_back(c);
///     }
/// };
///
/// Controller con(probeResult);
/// con.OpenMode(Controller::Desktop);
/// std::vector<Contact> contactList;
/// StoreContact storage(contactList);
/// RecordParser<Contact, StoreContact> parser(storage);
/// con.LoadDatabase(con.GetDBID("Address Book"), parser);
/// </pre>
///
template <class RecordT, class StorageT>
class RecordParser : public RecordParserBase
{
        StorageT *m_store;
        bool m_owned;
        RecordT m_rec;
        bool m_record_valid;

public:
        /// Constructor that references an externally managed storage object.
        RecordParser(StorageT &storage)
                : m_store(&storage)
                , m_owned(false)
                , m_record_valid(false)
        {
        }

        /// Constructor that references a locally managed storage object.
        /// The pointer passed in will be stored, and freed when this class
        /// is destroyed.  It is safe to call this constructor with
        /// a 'new'ly created storage object.
        RecordParser(StorageT *storage = 0)
                : m_store(storage)
                , m_owned(true)
                , m_record_valid(false)
        {
        }

        ~RecordParser()
        {
                if( this->m_owned )
                        delete m_store;
        }

        virtual StorageT* GetStore()
        {
                return m_store;
        }

        virtual const StorageT* GetStore() const
        {
                return m_store;
        }

        virtual void ParseRecord(const DBData &data, const IConverter *ic)
        {
                m_record_valid = false;
                ParseDBData(data, m_rec, ic);
                m_record_valid = true;

                if( m_store )
                        (*m_store)(m_rec);
        }

        //
        // RecordParserBase overrides
        //

        // These functions are always valid, regardless of the
        // state of the parser.
        virtual const char * GetDBName() const
        {
                return RecordT::GetDBName();
        }

        virtual uint8_t GetDefaultRecType() const
        {
                return RecordT::GetDefaultRecType();
        }

        // These functions depend on the parser having just parsed
        // a record successfully.
        virtual bool IsRecordValid() const
        {
                return m_record_valid;
        }

        virtual uint8_t GetRecType() const
        {
                return m_rec.GetRecType();
        }

        virtual uint32_t GetUniqueId() const
        {
                return m_rec.GetUniqueId();
        }

        virtual void Dump(std::ostream &os) const
        {
                m_rec.Dump(os);
        }
};

//
// AllRecordStore
//
/// Base class with overloaded functor behaviour for all available
/// record classes.  To be used with AllRecordParser.
///
class BXEXPORT AllRecordStore
{
public:
        AllRecordStore() {}
        virtual ~AllRecordStore() {}

#undef HANDLE_PARSER
#define HANDLE_PARSER(tname) \
        virtual void operator() (const Barry::tname &) = 0;

        ALL_KNOWN_PARSER_TYPES
};

//
// MultiRecordParser
//
/// Container parser class that accepts multiple Parser objects
/// (often RecordParser<> objects but they don't have to be) and
/// automatically routes incoming records to the appropriate parser.
/// Note that this container owns *all* Parser objects, and will
/// free them upon destruction.
///
/// Incoming records that have no matching parser are passed to the
/// default parser object, if one exists, otherwise they are dropped
/// silently.  The default parser object is also owned by the container,
/// and will be freed on destruction.
///
/// Do NOT derive your own personal parser classes from this,
/// unless you are perfectly confident that you will catch
/// future API changes on the devel tree without the compiler's
/// help.
///
class BXEXPORT MultiRecordParser : public Parser
{
        typedef std::map<std::string, Parser*>                  map_type;

        Parser *m_delete_default;       // if set, will be freed
        Parser *m_default;              // used by all code for actual work
                                        // and may or may not be "owned" by us
        map_type m_parsers;

public:
        // takes ownership of default_parser!
        explicit MultiRecordParser(Parser *default_parser = 0);

        // does not take ownership of the default_parser
        explicit MultiRecordParser(Parser &default_parser);

        ~MultiRecordParser();

        /// Adds given parser to list and takes ownership of it
        void Add(const std::string &dbname, Parser *parser);

        /// Adds given parser to list and takes ownership of it
        void Add(RecordParserBase *parser);

        /// Creates a RecordParser<> object using the given record
        /// type and AllRecordStore.  Does NOT take ownership of the
        /// store object, since it can be used multiple times for
        /// multiple records.
        template <class RecordT>
        void Add(AllRecordStore &store)
        {
                Add( RecordT::GetDBName(),
                        new RecordParser<RecordT, AllRecordStore>(store) );
        }

        /// Two helper template functions that create the RecordParser<>
        /// automatically based on the function call.  Both pointer and
        /// reference versions.
        template <class RecordT, class StorageT>
        void Add(StorageT *store)
        {
                Add( RecordT::GetDBName(),
                        new RecordParser<RecordT, StorageT>(store) );
        }

        template <class RecordT, class StorageT>
        void Add(StorageT &store)
        {
                Add( RecordT::GetDBName(),
                        new RecordParser<RecordT, StorageT>(store) );
        }

        /// Creates a RecordParser<> object for the given database name,
        /// using DumpStore<> with the given stream for the output,
        /// and adds it to list.
        /// Returns false if there is no known Record class for dbname.
        bool Add(const std::string &dbname, std::ostream &os);

        /// Creates a RecordParser<> object for the given database name,
        /// using the given store object.
        /// Returns false if there is no known Record class for dbname.
        bool Add(const std::string &dbname, AllRecordStore &store);

        // Parser overrides
        virtual void ParseRecord(const DBData &data, const IConverter *ic);
};

//
// AllRecordDumpStore
//
/// Derived from AllRecordStore, which just calls each record's
/// Dump() member with the given stream.
///
class BXEXPORT AllRecordDumpStore : public AllRecordStore
{
protected:
        std::ostream &m_os;

public:
        explicit AllRecordDumpStore(std::ostream &os)
                : m_os(os)
        {
        }

#undef HANDLE_PARSER
#define HANDLE_PARSER(tname) \
        virtual void operator() (const Barry::tname &);

        ALL_KNOWN_PARSER_TYPES
};

//
// AllRecordParser
//
/// Convenience parser that creates a MultiRecordParser with all known
/// record parsers added.  If an AllRecordStore pointer is passed in,
/// this class takes ownership of it, and uses it as the store object
/// for all the RecordParser<> objects it creates.  If not, then
/// a custom DumpStore<> object is created with the given stream
/// for each RecordParser<> added.
///
/// The default parser object behaves just like MultiRecordParser
///
/// This class takes ownership of all pointers passed in.
///
class BXEXPORT AllRecordParser : public MultiRecordParser
{
        AllRecordStore *m_store;

protected:
        // does not take ownership of store, by itself,
        // but the constructor that calls it might
        void AddRecords(std::ostream *os, AllRecordStore *store);

public:
        // takes ownership of default_parser and store!
        explicit AllRecordParser(std::ostream &os,
                Parser *default_parser = 0,
                AllRecordStore *store = 0);

        // does not take ownership of default_parser or store
        AllRecordParser(Parser &default_parser, AllRecordStore &store);

        ~AllRecordParser();
};

//
// TeeParser
//
/// Sends incoming DBData objects to all the parsers in its list.
/// This parser container does NOT own the parsers added.
///
class BXEXPORT TeeParser : public Parser
{
        typedef std::vector<Parser*>                    parser_list_type;

        parser_list_type m_external_parsers, m_owned_parsers;

public:
        TeeParser();
        ~TeeParser();

        /// Adds parser to internal list, and takes ownership of the
        /// pointer.
        void Add(Parser *p);

        /// Adds parser to internal list.  Does NOT own the parser reference.
        void Add(Parser &p);

        void ParseRecord(const DBData &data, const IConverter *ic);
};

} // namespace Barry

#endif