1. 创建型模式 (5) 抽象工厂模式

1. 创建型模式 (5) 抽象工厂模式

抽象工厂模式（Abstract Factory Pattern）是围绕一个超级工厂创建其他工厂。该超级工厂又称为其他工厂的工厂。

在抽象工厂模式中，接口是负责创建一个相关对象的工厂，不需要显式指定它们的类。每个生成的工厂都能按照工厂模式提供对象。

无论是简单工厂模式，工厂方法模式，还是抽象工厂模式，他们都属于工厂模式，在形式和特点上也是极为相似的，他们的最终目的都是为了解耦。

1. 抽象工厂模式

package com.andrew.pattern0105.abstractFactory.modal01;
public interface Shape {
    void draw();
}

package com.andrew.pattern0105.abstractFactory.modal01;
public interface Color {
    void fill();
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Circle implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Circle draw method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Rectangle implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Rectangle draw method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Square implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Square draw method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Red implements Color {
    @Override
    public void fill() {
        System.out.println("Inside red fill method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Green implements Color {
    @Override
    public void fill() {
        System.out.println("Inside green fill method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class Blue implements Color {
    @Override
    public void fill() {
        System.out.println("Inside blue fill method.");
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public abstract class AbstractFactory {
    public abstract Color getColor(String color);
    public abstract Shape getShape(String shape);
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class ShapeFactory extends AbstractFactory {
    @Override
    public Color getColor(String color) {
        return null;
    }
    @Override
    public Shape getShape(String shapeType) {
        if (null == shapeType) {
            return null;
        }
        if (shapeType.equalsIgnoreCase("CIRCLE")) {
            return new Circle();
        } else if (shapeType.equalsIgnoreCase("RECTANGLE")) {
            return new Rectangle();
        } else if (shapeType.equalsIgnoreCase("SQUARE")) {
            return new Square();
        }
        return null;
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class ColorFactory extends AbstractFactory {
    @Override
    public Color getColor(String color) {
        if (null == color) {
            return null;
        }
        if (color.equalsIgnoreCase("RED")) {
            return new Red();
        } else if (color.equalsIgnoreCase("GREEN")) {
            return new Green();
        } else if (color.equalsIgnoreCase("BLUE")) {
            return new Blue();
        }
        return null;
    }
    @Override
    public Shape getShape(String shapeType) {
        return null;
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
public class FactoryProducer {
    public static AbstractFactory getFactory(String choice) {
        if (choice.equalsIgnoreCase("SHAPE")) {
            return new ShapeFactory();
        } else if (choice.equalsIgnoreCase("COLOR")) {
            return new ColorFactory();
        }
        return null;
    }
}

package com.andrew.pattern0105.abstractFactory.modal01;
/**
 * 1. 基础抽象工厂模式
 * 
 * @author andrew
 * @date 2018/07/15
 */
public class AbstractFactoryClient {
    public static void main(String[] args) {
        AbstractFactory shapeFactory = FactoryProducer.getFactory("SHAPE");
        Shape shape1 = shapeFactory.getShape("CIRCLE");
        shape1.draw();
        Shape shape2 = shapeFactory.getShape("RECTANGLE");
        shape2.draw();
        Shape shape3 = shapeFactory.getShape("SQUARE");
        shape3.draw();
        AbstractFactory colorFactory = FactoryProducer.getFactory("COLOR");
        Color color1 = colorFactory.getColor("RED");
        color1.fill();
        Color color2 = colorFactory.getColor("Green");
        color2.fill();
        Color color3 = colorFactory.getColor("BLUE");
        color3.fill();
    }
}
运行结果：
Inside Circle draw method.
Inside Rectangle draw method.
Inside Square draw method.
Inside red fill method.
Inside green fill method.
Inside blue fill method.