mx::mxEternal< Type > Class Template Reference

List of all members.

Public Types
typedef std::map< std::string, Type >::iterator	iterator
Public Member Functions
	mxEternal (std::string name="etern.mxdb", mxEternalRW< Type > *typeobj=new mxEternalRW< Type >)
void	setStreamRW (mxEternalRW< Type > *typeobjx)
int	read ()
int	save ()
const std::string	getName () const
Type &	operator[] (std::string n)
map< std::string, Type > *	operator-> ()

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Detailed Description

template<typename Type>
class mx::mxEternal< Type >

persistence of objects

Definition at line 84 of file mxeternal.h.

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Member Typedef Documentation

template<typename Type>

typedef std::map<std::string, Type>::iterator mx::mxEternal< Type >::iterator

typedef

Definition at line 126 of file mxeternal.h.

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Constructor & Destructor Documentation

template<typename Type >

mx::mxEternal< Type >::mxEternal	(	std::string	name = "etern.mxdb",
		mxEternalRW< Type > *	typeobj = new mxEternalRW<Type>
	)			[inline]

mxEternal default constructor

Parameters:

	name	name of file to write object stream to
	typeobj	read/write object containing object read/write functions

Definition at line 174 of file mxeternal.h.

References mx::mxEternal< Type >::read().

        {
                typeobj = typeobject;
                name = vname;
                read();
        }

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Member Function Documentation

template<typename Type>

const std::string mx::mxEternal< Type >::getName

(

)

const [inline]

get the name of the database file

Returns:

string of the name of database

Definition at line 109 of file mxeternal.h.

{ return name; } // get this DB filename

template<typename Type>

map<std::string, Type>* mx::mxEternal< Type >::operator->

(

)

[inline]

overloaded -> operator

Returns:

pointer to map of variables of type Type

Definition at line 123 of file mxeternal.h.

{ return &this_map; } // use operator -> to access the maps member functions

template<typename Type>

Type& mx::mxEternal< Type >::operator[]

(

std::string

n

)

[inline]

overloaded [] operator for access object in array by n

Parameters:

n

string for array access

Returns:

array variable index of type specified in template parameter

Definition at line 117 of file mxeternal.h.

{ return this_map[n]; }

template<typename Type >

int mx::mxEternal< Type >::read

(

)

[inline]

read the database from the file specified in constructor

Returns:

integer for success of operation

Definition at line 195 of file mxeternal.h.

Referenced by mx::mxEternal< Type >::mxEternal().

        {

                if(!this_map.empty())  this_map.erase(this_map.begin(), this_map.end());

                fobj.open(name.c_str(), std::ios::in | std::ios::binary);
                if(!fobj.is_open()) return 1; // no db or removed start over

                unsigned int number_of_types = 0;

                fobj.read((char*)&number_of_types, sizeof(number_of_types));

                for(unsigned int i = 0; (i < number_of_types) && (!fobj.eof()); i++)
                {
                        unsigned int name_index = 0;
                        fobj.read((char*)&name_index, sizeof(name_index));

                        if(static_cast<int>(name_index) < 0) return -1;

                        char *buf = 0;

                        try
                        {

                                buf = new char [ name_index+1 ];
                                fobj.read((char*)buf, name_index);
                                buf[name_index] =  0;
                                readType();
                                this_map[buf] = typedata;
                                delete [] buf;
                                buf = 0;

                        }
                        catch (...)
                        {

                                if(buf != 0) delete [] buf;

                        }

                }
                fobj.close();
                return 0;
        }

template<typename Type >

int mx::mxEternal< Type >::save

(

)

[inline]

write teh database to file specified in constructor

Returns:

integer for success of operation

Definition at line 239 of file mxeternal.h.

        {

                fobj_write.open(name.c_str(), std::ios::out | std::ios::binary);
                if(!fobj_write.is_open()) return -1;

                unsigned int length = this_map.size();

                fobj_write.write((char*)&length, sizeof(length));

                typename mxEternal<Type>::iterator i;

                for(i= this_map.begin(); i!=this_map.end(); i++)
                {

                        unsigned int len =i->first.length();
                        const char *str = i->first.c_str();
                        fobj_write.write((char*)&len, sizeof(len));
                        fobj_write.write((char*)str,len);
                        typedata = i->second;
                        writeType();
                }

                fobj_write.close();
                return 0;

        }

template<typename Type >

void mx::mxEternal< Type >::setStreamRW

(

mxEternalRW< Type > *

typeobjx

)

[inline]

setStreamRW set the current read/write stream

Parameters:

typeobjx

current stream object pointer

Definition at line 181 of file mxeternal.h.

        {
                if(typeobj != 0) delete typeobj;
                typeobj = 0;
                typeobj = typeobjx;
        }

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The documentation for this class was generated from the following file:

• mxeternal.h