设计模式-建造者模式

业务场景

未使用建造者模式实现

#include<iostream>
#include<string>
#include<vector>
#include<sstream>
using namespace std;


template<class T>
string ConvertToString(T value) {
	stringstream ss;
	ss << value;
	return ss.str();
}

class ExportHeaderModel {

public:
	ExportHeaderModel(string id, string date) :m_DepId(id), m_ExportDate(m_ExportDate) {
	
	};

	string getId() { return m_DepId; };
	string getDate() { return m_ExportDate; };


private:
	string m_DepId;
	string m_ExportDate;
};

class ExportDataModel {

public:
	ExportDataModel(string strTransId, double Quantity) :m_strTransID(strTransId), m_Quantity(Quantity) {};


	string getStrTransId() { return m_strTransID; };
	double getQuantity() { return m_Quantity; };


private:
	string m_strTransID;
	double m_Quantity;

};


class ExportFooterModel {

public:
	ExportFooterModel(string user):m_exportUser(user) {}
	string getExportUser() { return m_exportUser; };

private:
	string m_exportUser;
};



class ExportToTxtHelper {

public:

	void doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm);
};

void ExportToTxtHelper::doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm) {

	//
	string strTmp = "";
	//1.文件头
	strTmp += header.getId() + "," + header.getDate() + "\n";
	
	
	//2.文件体
	auto iter = edmCollection.begin();
	for ( ; iter != edmCollection.end() ; iter++)
	{
		strTmp += (*iter)->getStrTransId() + ":" + ConvertToString((*iter)->getQuantity()) + "\n";
		
	}

	//3.文件尾
	strTmp += efm.getExportUser() + "\n";

	printf("******\n");
	printf("%s", strTmp.c_str());
	printf("******\n");
}



class ExportToXmlHelper {

public:

	void doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm);
};



void ExportToXmlHelper::doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm) {

	string strTmp = "";
	strTmp.append("<?xml version='1.0' encoding='utf-8'>\n");
	strTmp.append("<Root>\n");
	strTmp.append("    <header>\n");
	strTmp.append("           <DepId>\n");
	strTmp.append(header.getId() + "</DepId>\n");
	strTmp.append("           <Date>\n");
	strTmp.append(header.getDate() + "</Date>\n");
	strTmp.append("    </header>\n");
	/*后面省略*/

	printf("%s", strTmp.c_str());

}

int main(void) {

	ExportHeaderModel* header = new ExportHeaderModel("NanJing", "6月1号");
	auto data1 = new ExportDataModel("1", 1000.00f);
	auto data2 = new ExportDataModel("2", 2000.00f);
	vector<ExportDataModel*> mVec;
	mVec.push_back(data1);
	mVec.push_back(data2);

	ExportFooterModel* footer = new ExportFooterModel("ZJ");

	//ExportToTxtHelper helper;
	ExportToXmlHelper helper;
	helper.doExport(*header, mVec, *footer);

	delete header;
	delete data1;
	delete data2;
	delete footer;

}

使用建造者模式

#include<iostream>
#include<string>
#include<vector>
#include<sstream>
using namespace std;


template<class T>
string ConvertToString(T value) {
	stringstream ss;
	ss << value;
	return ss.str();
}

class ExportHeaderModel {

public:
	ExportHeaderModel(string id, string date) :m_DepId(id), m_ExportDate(m_ExportDate) {

	};

	string getId() { return m_DepId; };
	string getDate() { return m_ExportDate; };


private:
	string m_DepId;
	string m_ExportDate;
};

class ExportDataModel {

public:
	ExportDataModel(string strTransId, double Quantity) :m_strTransID(strTransId), m_Quantity(Quantity) {};


	string getStrTransId() { return m_strTransID; };
	double getQuantity() { return m_Quantity; };


private:
	string m_strTransID;
	double m_Quantity;

};


class ExportFooterModel {

public:
	ExportFooterModel(string user) :m_exportUser(user) {}
	string getExportUser() { return m_exportUser; };

private:
	string m_exportUser;
};


/*
class ExportToTxtHelper {

public:

	void doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm);
};

void ExportToTxtHelper::doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm) {

	//
	string strTmp = "";
	//1.文件头
	strTmp += header.getId() + "," + header.getDate() + "\n";


	//2.文件体
	auto iter = edmCollection.begin();
	for (; iter != edmCollection.end(); iter++)
	{
		strTmp += (*iter)->getStrTransId() + ":" + ConvertToString((*iter)->getQuantity()) + "\n";

	}

	//3.文件尾
	strTmp += efm.getExportUser() + "\n";

	printf("******\n");
	printf("%s", strTmp.c_str());
	printf("******\n");
}


*/
/*
class ExportToXmlHelper {

public:

	void doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm);
};



void ExportToXmlHelper::doExport(ExportHeaderModel& header, vector<ExportDataModel*>& edmCollection, ExportFooterModel& efm) {

	string strTmp = "";
	strTmp.append("<?xml version='1.0' encoding='utf-8'>\n");
	strTmp.append("<Root>\n");
	strTmp.append("    <header>\n");
	strTmp.append("           <DepId>\n");
	strTmp.append(header.getId() + "</DepId>\n");
	strTmp.append("           <Date>\n");
	strTmp.append(header.getDate() + "</Date>\n");
	strTmp.append("    </header>\n");
	
	printf("%s", strTmp.c_str());

}
*/

class Builder {


public:
	virtual void builderHeader(ExportHeaderModel header) = 0;
	virtual void builderBody(vector<ExportDataModel*>& data) = 0;
	virtual void builderFoot(ExportFooterModel& footer)=0;
	virtual string getResult() { return strTmp; };
protected:
	Builder() { strTmp = ""; };

	string strTmp;
};


class TxtBuiler : public Builder {


public:

	virtual void builderHeader(ExportHeaderModel header) {

		strTmp += header.getId() + "," + header.getDate() + "\n";
	}
	
	virtual void builderBody(vector<ExportDataModel*>& data) {
		auto iter = data.begin();
		for (; iter != data.end(); iter++)
		{
			strTmp += (*iter)->getStrTransId() + ":" + ConvertToString((*iter)->getQuantity()) + "\n";

		}
	}

	virtual void builderFoot(ExportFooterModel& footer) {
		strTmp += footer.getExportUser() + "\n";
	}
	
};


class Director {

public:
	Director(Builder* builder) : m_builder(builder){};
	
	void builder(ExportHeaderModel& header, vector<ExportDataModel*>& data, ExportFooterModel& footer) {

		m_builder->builderHeader(header);
		m_builder->builderBody(data);
		m_builder->builderFoot(footer);
	}
private:
	Builder* m_builder;
};


int main(void) {


	ExportHeaderModel* header = new ExportHeaderModel("NanJing", "6月1号");
	auto data1 = new ExportDataModel("1", 1000.00f);
	auto data2 = new ExportDataModel("2", 2000.00f);
	vector<ExportDataModel*> mVec;
	mVec.push_back(data1);
	mVec.push_back(data2);

	ExportFooterModel* footer = new ExportFooterModel("ZJ");

	//ExportToTxtHelper helper;
	TxtBuiler builder;
	Director director(&builder);
	director.builder(*header, mVec, *footer);
	cout << (&builder)->getResult();
	
	delete header;
	delete data1;
	delete data2;
	delete footer;

}