myreductshortener.cpp

ROSETTA C++库是一个C++类库和例程集合

//-------------------------------------------------------------------
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Revisions.....:
//===================================================================

#include <stdafx.h> // Precompiled headers.
#include <copyright.h>

#include <kernel/algorithms/myreductshortener.h>
#include <kernel/algorithms/keyword.h>

#include <kernel/structures/reduct.h>
#include <kernel/structures/reducts.h>

#include <kernel/utilities/mathkit.h>

#include <kernel/basic/bits.h>
#include <kernel/basic/message.h>

//-------------------------------------------------------------------
// Methods for class MyReductShortener.
//===================================================================

//-------------------------------------------------------------------
// Constructors/destructor.
//===================================================================

MyReductShortener::MyReductShortener() {
	SetShorteningStrategy(0);
	SetLowerPercentage(0.0f);
	SetUpperPercentage(90.0f);
	SetAttribute(0);
	SetPrimaryAttribute(0);
	SetSecondaryAttribute(1);
}

MyReductShortener::~MyReductShortener() {
}

//-------------------------------------------------------------------
// Methods inherited from Identifier.
//===================================================================

IMPLEMENTIDMETHODS(MyReductShortener, MYREDUCTSHORTENER, ReductShortener)

//-------------------------------------------------------------------
// Methods inherited from Algorithm.
//===================================================================

//-------------------------------------------------------------------
// Method........: GetParameters
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......:
// Revisions.....:
//===================================================================

String
MyReductShortener::GetParameters() const {

	String parameters;

	// Shortening strategy (compound).
	parameters += Keyword::Shortening();
	parameters += Keyword::Assignment();
	parameters += String::Format(GetShorteningStrategy());

	parameters += Keyword::Separator();

	// Percentage parameters.
	if (GetShorteningStrategy() & SHORTENING_PERCENTAGE) {

		parameters += Keyword::Percentage() + Keyword::Dot() + Keyword::Lower();
		parameters += Keyword::Assignment();
		parameters += String::Format(GetLowerPercentage());

		parameters += Keyword::Separator();

		parameters += Keyword::Percentage() + Keyword::Dot() + Keyword::Upper();
		parameters += Keyword::Assignment();
		parameters += String::Format(GetUpperPercentage());

		parameters += Keyword::Separator();

	}

	// Occurrence parameters.
	if (GetShorteningStrategy() & SHORTENING_OCCURRENCE) {

		parameters += Keyword::Attribute();
		parameters += Keyword::Assignment();
		parameters += String::Format(GetAttribute());

		parameters += Keyword::Separator();

	}

	// Combined occurrence parameters.
	if (GetShorteningStrategy() & SHORTENING_COMBINEDOCCURRENCE) {

		parameters += Keyword::Primary();
		parameters += Keyword::Assignment();
		parameters += String::Format(GetPrimaryAttribute());

		parameters += Keyword::Separator();

		parameters += Keyword::Secondary();
		parameters += Keyword::Assignment();
		parameters += String::Format(GetSecondaryAttribute());

		parameters += Keyword::Separator();

	}

	return parameters + ReductFilter::GetParameters();

}

//-------------------------------------------------------------------
// Method........: SetParameter
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......:
// Revisions.....:
//===================================================================

bool
MyReductShortener::SetParameter(const String &keyword, const String &value) {

	// Shortening strategy.
	if (keyword == Keyword::Shortening() && value.IsInteger())
		return SetShorteningStrategy(value.GetInteger());

	if (keyword == Keyword::Shortening() && value == GetString(SHORTENING_PERCENTAGE))
		return SetShorteningStrategy(GetShorteningStrategy() | SHORTENING_PERCENTAGE);

	if (keyword == Keyword::Shortening() && value == GetString(SHORTENING_OCCURRENCE))
		return SetShorteningStrategy(GetShorteningStrategy() | SHORTENING_OCCURRENCE);

	if (keyword == Keyword::Shortening() && value == GetString(SHORTENING_COMBINEDOCCURRENCE))
		return SetShorteningStrategy(GetShorteningStrategy() | SHORTENING_COMBINEDOCCURRENCE);

	// Lower percentage.
	if ((keyword == Keyword::Percentage() + Keyword::Dot() + Keyword::Lower()) && value.IsFloat())
		return SetLowerPercentage(value.GetFloat());

	// Lower percentage (backwards compatibility).
	if (keyword == Keyword::LPercentage() && value.IsFloat())
		return SetLowerPercentage(value.GetFloat());

	// Upper percentage.
	if ((keyword == Keyword::Percentage() + Keyword::Dot() + Keyword::Upper()) && value.IsFloat())
		return SetUpperPercentage(value.GetFloat());

	// Upper percentage (backwards compatibility).
	if (keyword == Keyword::UPercentage() && value.IsFloat())
		return SetUpperPercentage(value.GetFloat());

  // Attribute, absolute presence.
	if (keyword == Keyword::Attribute() && value.IsInteger())
		return SetAttribute(value.GetInteger());

  // Attribute, primary, relative presence.
	if (keyword == Keyword::Primary() && value.IsInteger())
		return SetPrimaryAttribute(value.GetInteger());

  // Attribute, secondary, relative presence.
	if (keyword == Keyword::Secondary() && value.IsInteger())
		return SetSecondaryAttribute(value.GetInteger());

	return ReductFilter::SetParameter(keyword, value);

}

//-------------------------------------------------------------------
// Method........: Apply
// Author........: Aleksander 豩rn
// Date..........:
// Description...: Takes a reduct set as input and shortens each reduct
//                 according to some shortening scheme.
//
//                 Attribute indices are virtual, i.e. relative to the
//                 masked table.
//
// Comments......: Assumes that library clients use handles.
//
//                 Compound criterion currently functions as an 'OR',
//                 perhaps it should function as an 'AND'...?
//
// Revisions.....: A