builder.h

来自「设计模式C++源码(other)Builder.rar」· C头文件 代码 · 共 120 行

/**
 * builder.h
 * Implemented by Blueprint Technologies, Inc.
 */

#ifndef _builder_h
#define _builder_h

/**
 * Represents the complex object under construction. ConcreteBuilder
 * builds the product's internal representation and defines the
 * process by which it's assembled.
 */

class Product
{
};

class Part
{
};

/**
 * Specifies an abstract interface for creating parts of
 * a Product object.
 */

class Builder
{

protected:
	Part* partA;
	Part* partB;
	Part* partC;
	Product* product;

public:
	Builder(): partA(0), partB(0), partC(0), product(0)
	{
	};

	virtual ~Builder()
	{
		if( partA ) delete partA;
		if( partB ) delete partB;
		if( partC ) delete partC;
		if( product ) delete product;
	};

	virtual void buildPartA() = 0;
	virtual void buildPartB() = 0;
	virtual void buildPartC() = 0;
};

/**
 * Constructs and assembles parts of the product by implementing
 * the Builder interface. Defines and keeps track of the
 * representation is creates. Provides an interface for retrieving
 * the product.
 */

class ConcreteBuilder: public Builder
{

public:
	ConcreteBuilder(): Builder()
	{
	};

	virtual void buildPartA()
	{
		partA = new Part();
	};

	virtual void buildPartB()
	{
		partB = new Part();
	};

	virtual void buildPartC()
	{
		partC = new Part();
	};

	Product* getResult()
	{
		/**
		 * assemble the parts into a product.
		 */

		return new Product();
	};
};

/**
 * Constructs an object using the Builder interface.
 */

class Director
{

private:
	Builder* builder;

public:
	Director( Builder* builder )
	{
		this -> builder = builder;
	};

	void construct()
	{
		builder -> buildPartA();
		builder -> buildPartB();
		builder -> buildPartC();
	};
};

#endif