组合模式

代码位置：k8s.io/apimachinery/pkg/runtime/serializer/recognizer

typical case

recognizer.decoder

带有修饰器模式

tree-like

code

因为 recognizer.decoder 实现了 recognizer.RecognizingDecoder 和 runtime.Decoder 接口，所以 recognizer.decoder 可以是本身的子节点。

recognizer.RecognizingDecoder

type RecognizingDecoder interface {
    runtime.Decoder
    RecognizesData(peek io.Reader) (ok, unknown bool, err error)
}

recognizer.decoder

type decoder struct {
    decoders []runtime.Decoder
}

decoder.NewDecoder

func NewDecoder(decoders ...runtime.Decoder) runtime.Decoder {
    return &decoder{
        decoders: decoders,
    }
}