ex11.go

package chess

import "bytes"

type piece struct {
    representation string
}

type location struct {
    current *piece
}

type board struct {
    locations []*location
}

func NewPiece(representation string) *piece {
    return &piece{representation: representation}
}

func (p *piece) character() string {
    return p.representation[0:1]
}

func (p *piece) addTo(buffer *bytes.Buffer) {
    buffer.WriteString(p.character())
}

func NewLocation(piece *piece) *location {
    return &location{current: piece}
}

func (l *location) addTo(buffer *bytes.Buffer) {
    l.current.addTo(buffer)
}

func NewBoard() *board {
    locations := []*location{
        NewLocation(NewPiece("London")),
        NewLocation(NewPiece("New York")),
        NewLocation(NewPiece("Dubai")),
    }
    return &board{
        locations: locations,
    }
}

func (b *board) squares() []*location {
    return b.locations
}

func (b *board) BoardRepresentation() string {
    var buffer = &bytes.Buffer{}
    for _, l := range b.squares() {
        l.addTo(buffer)
    }
    return buffer.String()
}