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#include "Filter.h"

XERCES_CPP_NAMESPACE_USE
using namespace std;

//****************************************************************************************//
//									Filter Class										  //	
//****************************************************************************************//

Filter::Filter(DOMElement *filterElm) {
	this->Parse(filterElm);
}

// ***************************************************************************************	//
//								 Public members												//
// ***************************************************************************************	//
bool Filter::DoFilter(Item* item) {

	OvalEnum::ResultEnumeration result = this->state->Analyze(item);

	// for a filter really want to convert the result to a boolean
	if (result != OvalEnum::RESULT_TRUE && result != OvalEnum::RESULT_FALSE)
		throw AbsStateException("Filter::ApplyFilter method unable to convert result value to a boolean. Found result: " + OvalEnum::ResultToString(result));

	return (result == OvalEnum::RESULT_TRUE && !this->IsExcluding()) ||
		(result == OvalEnum::RESULT_FALSE && this->IsExcluding());
}

void Filter::Parse(DOMElement* filterElm) {
	string stateId = XmlCommon::GetDataNodeValue(filterElm);
	string actionStr = XmlCommon::GetAttributeByName(filterElm, "action");
	this->SetExcluding(actionStr.empty() || actionStr == "exclude");
	this->state = State::GetStateById(stateId);
}

bool FilterFunctor::operator()(Item *item) {
	// the *_if (e.g. remove_if) algorithms need true
	// returned to indicate the item should be removed,
	// so we negate DoFilter's return value.
	return !this->filter->DoFilter(item);
}
