kubernetes directed_acyclic 源码
kubernetes directed_acyclic 代码
文件路径：/third_party/forked/gonum/graph/simple/directed_acyclic.go
package simple
import (
"k8s.io/kubernetes/third_party/forked/gonum/graph"
)
// DirectedAcyclicGraph implements graph.Directed using UndirectedGraph,
// which only stores one edge for any node pair.
type DirectedAcyclicGraph struct {
*UndirectedGraph
}
func NewDirectedAcyclicGraph(self, absent float64) *DirectedAcyclicGraph {
return &DirectedAcyclicGraph{
UndirectedGraph: NewUndirectedGraph(self, absent),
}
}
func (g *DirectedAcyclicGraph) HasEdgeFromTo(u, v graph.Node) bool {
edge := g.UndirectedGraph.EdgeBetween(u, v)
if edge == nil {
return false
}
return (edge.From().ID() == u.ID())
}
func (g *DirectedAcyclicGraph) From(n graph.Node) []graph.Node {
if !g.Has(n) {
return nil
}
fid := n.ID()
nodes := make([]graph.Node, 0, g.UndirectedGraph.edges[n.ID()].Len())
g.UndirectedGraph.edges[n.ID()].Visit(func(neighbor int, edge graph.Edge) {
if edge.From().ID() == fid {
nodes = append(nodes, g.UndirectedGraph.nodes[edge.To().ID()])
}
})
return nodes
}
func (g *DirectedAcyclicGraph) VisitFrom(n graph.Node, visitor func(neighbor graph.Node) (shouldContinue bool)) {
if !g.Has(n) {
return
}
fid := n.ID()
g.UndirectedGraph.edges[n.ID()].Visit(func(neighbor int, edge graph.Edge) {
if edge.From().ID() == fid {
if !visitor(g.UndirectedGraph.nodes[edge.To().ID()]) {
return
}
}
})
}
func (g *DirectedAcyclicGraph) To(n graph.Node) []graph.Node {
if !g.Has(n) {
return nil
}
tid := n.ID()
nodes := make([]graph.Node, 0, g.UndirectedGraph.edges[n.ID()].Len())
g.UndirectedGraph.edges[n.ID()].Visit(func(neighbor int, edge graph.Edge) {
if edge.To().ID() == tid {
nodes = append(nodes, g.UndirectedGraph.nodes[edge.From().ID()])
}
})
return nodes
}
func (g *DirectedAcyclicGraph) VisitTo(n graph.Node, visitor func(neighbor graph.Node) (shouldContinue bool)) {
if !g.Has(n) {
return
}
tid := n.ID()
g.UndirectedGraph.edges[n.ID()].Visit(func(neighbor int, edge graph.Edge) {
if edge.To().ID() == tid {
if !visitor(g.UndirectedGraph.nodes[edge.From().ID()]) {
return
}
}
})
}
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