71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
/*
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* Copyright 2022 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dag
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import "d7y.io/dragonfly/v2/pkg/container/set"
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// Vertex is a vertex of the directed acyclic graph.
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type Vertex[T comparable] struct {
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ID string
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Value T
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Parents set.SafeSet[*Vertex[T]]
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Children set.SafeSet[*Vertex[T]]
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}
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// New returns a new Vertex instance.
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func NewVertex[T comparable](id string, value T) *Vertex[T] {
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return &Vertex[T]{
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ID: id,
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Value: value,
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Parents: set.NewSafeSet[*Vertex[T]](),
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Children: set.NewSafeSet[*Vertex[T]](),
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}
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}
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// Degree returns the degree of vertex.
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func (v *Vertex[T]) Degree() int {
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return int(v.Parents.Len() + v.Children.Len())
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}
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// InDegree returns the indegree of vertex.
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func (v *Vertex[T]) InDegree() int {
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return int(v.Parents.Len())
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}
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// OutDegree returns the outdegree of vertex.
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func (v *Vertex[T]) OutDegree() int {
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return int(v.Children.Len())
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}
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// DeleteInEdges deletes inedges of vertex.
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func (v *Vertex[T]) DeleteInEdges() {
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for _, parent := range v.Parents.Values() {
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parent.Children.Delete(v)
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}
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v.Parents = set.NewSafeSet[*Vertex[T]]()
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}
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// DeleteOutEdges deletes outedges of vertex.
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func (v *Vertex[T]) DeleteOutEdges() {
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for _, child := range v.Children.Values() {
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child.Parents.Delete(v)
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}
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v.Children = set.NewSafeSet[*Vertex[T]]()
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}
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