内容简介:builder.gobuilder_test.go程序输出如下,
builder.go
// builder package builder type VehicleProduct struct { Wheels int Seats int Structure string } type BuildProcess interface { SetWheels() BuildProcess SetSeats() BuildProcess SetStructure() BuildProcess GetVehicle() VehicleProduct } //MenufacturingDirector Begin type ManufacturingDiretcor struct { builder BuildProcess } func (f *ManufacturingDiretcor) Construct() { f.builder.SetWheels().SetSeats().SetStructure() } func (f *ManufacturingDiretcor) SetBuilder(b BuildProcess) { f.builder = b } //MenufacturingDirector End //Car Builder Start implements BuildProcess type CarBuilder struct { v VehicleProduct } func (c *CarBuilder) SetWheels() BuildProcess { c.v.Wheels = 4 return c } func (c *CarBuilder) SetSeats() BuildProcess { c.v.Seats = 5 return c } func (c *CarBuilder) SetStructure() BuildProcess { c.v.Structure = "Car" return c } func (c *CarBuilder) GetVehicle() VehicleProduct { return c.v } //Car Builder End //Bike Builder Start implements BuildProcess type BikeBuilder struct { v VehicleProduct } func (b *BikeBuilder) SetWheels() BuildProcess { b.v.Wheels = 2 return b } func (b *BikeBuilder) SetSeats() BuildProcess { b.v.Seats = 2 return b } func (b *BikeBuilder) SetStructure() BuildProcess { b.v.Structure = "Motorbike" return b } func (b *BikeBuilder) GetVehicle() VehicleProduct { return b.v } //Bike Builder End
builder_test.go
package builder import ( "testing" ) func TestBuilderPattern(t *testing.T) { manufactureComplex := ManufacturingDiretcor{} carBuilder := &CarBuilder{} manufactureComplex.SetBuilder(carBuilder) manufactureComplex.Construct() car := carBuilder.GetVehicle() if car.Wheels != 4 { t.Errorf("Wheels on a car must be 4, but it is %d \n", car.Wheels) } if car.Structure != "Car" { t.Errorf("Structure Of a car must be 'Car', but it is %v \n", car.Structure) } if car.Seats != 5 { t.Errorf("Seats on a car must be 5, but it is %d \n", car.Seats) } bikeBuilder := &BikeBuilder{} manufactureComplex.SetBuilder(bikeBuilder) manufactureComplex.Construct() motoBike := bikeBuilder.GetVehicle() motoBike.Seats = 1 if motoBike.Wheels != 2 { t.Errorf("Wheels on a motobike must be 2 but found %d \n", motoBike.Wheels) } if motoBike.Structure != "Motorbike" { t.Errorf("Structure of a motobike must be 'Motorbike' but found %v \n", motoBike.Structure) } }
程序输出如下,
image.png
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