attribute.cpp

一个简单灵活的数据挖掘实验平台

/************************************************************************/
/*		AUTHOR:   Leiming Hong                                          */
/*		INST.:    South China Univ. of Tech.							*/
/*      Date:     2005-10-25                                            */
/*      FUNC:     Attribute used for defining data column type          */   
/************************************************************************/
#pragma warning(disable: 4786) //: disable the warning for map<string,int>
#include "Attribute.h"
#include "Exception.h"

//: for testing
#include <iostream>
#include <ctime>
using namespace std;

Attribute::Attribute() 
	: _name(""),
      _type(_At::numeric),
	  _nvs(0)
{
	//: default mining attribute type
}
Attribute::Attribute(const string& name,_At type /* = _At::numeric */)
	: _name(name),
	  _type(type),
	  _nvs(0)
{
	if(_type == _At::nominal)
		_nvs = new map<string,int>();
}
Attribute::Attribute(const Attribute& attr)
{
	_name = attr._name;
	_type = attr._type;
	_nvs  = NULL;
	if(attr.is_nominal())
	{
		_nvs = new map<string,int>(*attr._nvs);
	}
}
Attribute::~Attribute()
{
	if(_nvs != NULL) delete _nvs;
}
string Attribute::get_name() const
{
	return _name;
}
void Attribute::set_name(const string& name)
{
	_name = name;
}
Attribute::_At Attribute::type() const
{
	return _type;
}
bool Attribute::is_nominal() const
{
	return _type == _At::nominal;
}
bool Attribute::is_numeric() const
{
	return _type == _At::numeric;
}
int Attribute::nominal_count() const
{
	if(!is_nominal())
		throw new Exception("Attribute: nominal_count not support!");
	return _nvs->size();
}
void Attribute::add_nominal(const string& nom)
{
	if(!is_nominal())
		throw new Exception("Attribute: add_nominal not support!");
	map<string,int>::iterator pos;
	pos = _nvs->find(nom);
	if(pos == _nvs->end()) _nvs->insert(pair<string,int>(nom,_nvs->size()));
}
int Attribute::nominal_value(const string& nom)
{
	if(!is_nominal())
		throw new Exception("Attribute: nominal_value not support!");
	map<string,int>::iterator pos = _nvs->find(nom);
	if(pos == _nvs->end()) return -1;
	return pos->second;
}
/************************************************************************
void main()
{
	time_t start,end;
	start = clock();
	try
	{
		Attribute attr("test",Attribute::_At::nominal);
		attr.add_nominal("A");
		attr.add_nominal("B");
		attr.add_nominal("C");
		cout<<attr.nominal_value("C")<<endl;
	}
	catch(Exception* e)
	{
		cout<<e->message()<<endl;
		delete e;
 	}
	end = clock();
	cout<<"Time eclipsed[s]: "<<(double)(end-start)/CLOCKS_PER_SEC<<endl;
}
/************************************************************************/