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nguyentienlong/main.go

Last active Aug 13, 2020
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Open close principle implemented in golang
// https://longka.info/blog/2020/08/13/solid-open-close-principle-implemented-in-golang/
package main
import (
"fmt"
"math"
)
type Shape interface {
GetArea() float64
}
type Square struct {
Width float64
}
func (s Square) GetArea() float64 {
return s.Width*s.Width
}
type Circle struct {
Radius float64
}
func (c Circle) GetArea() float64 {
return c.Radius * c.Radius * math.Pi
}
type Rectangle struct {
Length float64
Width float64
}
func (r Rectangle) GetArea() float64 {
return r.Width * r.Length
}
type ShapeManager struct {
shapes []Shape
}
func (smgr *ShapeManager) AddShape(shape Shape) {
smgr.shapes = append(smgr.shapes, shape)
}
func (smgr ShapeManager) GetTotalArea() float64 {
total := 0.0
for _, shape := range smgr.shapes {
total += shape.GetArea()
}
return total
}
func NewShapeManager() ShapeManager {
smgr := ShapeManager{}
smgr.shapes = []Shape{}
return smgr
}
func main() {
square := Square{10.0}
circle := Circle{12.0}
shapeManager := NewShapeManager()
shapeManager.AddShape(square)
shapeManager.AddShape(circle)
fmt.Printf("shapeManager %+v\n", shapeManager)
fmt.Println("Square Area ", square.GetArea())
fmt.Println("Circle Area ", circle.GetArea())
fmt.Println("Shape Manager Total Area ", shapeManager.GetTotalArea())
// add rectangle
rect := Rectangle{5.0, 6.0}
fmt.Println("Rectangle Area ", rect.GetArea())
shapeManager.AddShape(rect)
fmt.Printf("shapeManager %+v\n", shapeManager)
fmt.Println("Shape Manager Total Area ", shapeManager.GetTotalArea())
}
// https://longka.info/blog/2020/08/13/solid-open-close-principle-implemented-in-golang/
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