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126 lines
2.2 KiB
Go
126 lines
2.2 KiB
Go
package trie
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import "strings"
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// Node is the trie's node
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type Node[T any] struct {
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childMap map[string]*Node[T]
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childNode *Node[T] // optimize for only one child
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childStr string
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inited bool
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data T
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}
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func (n *Node[T]) getChild(s string) *Node[T] {
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if n.childMap == nil {
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if n.childNode != nil && n.childStr == s {
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return n.childNode
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}
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return nil
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}
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return n.childMap[s]
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}
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func (n *Node[T]) hasChild(s string) bool {
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return n.getChild(s) != nil
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}
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func (n *Node[T]) addChild(s string, child *Node[T]) {
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if n.childMap == nil {
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if n.childNode == nil {
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n.childStr = s
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n.childNode = child
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return
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}
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n.childMap = map[string]*Node[T]{}
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if n.childNode != nil {
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n.childMap[n.childStr] = n.childNode
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}
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n.childStr = ""
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n.childNode = nil
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}
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n.childMap[s] = child
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}
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func (n *Node[T]) getOrNewChild(s string) *Node[T] {
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node := n.getChild(s)
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if node == nil {
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node = newNode[T]()
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n.addChild(s, node)
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}
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return node
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}
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func (n *Node[T]) optimize() {
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if len(n.childStr) > 0 {
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n.childStr = strClone(n.childStr)
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}
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if n.childNode != nil {
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n.childNode.optimize()
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}
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if n.childMap == nil {
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return
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}
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switch len(n.childMap) {
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case 0:
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n.childMap = nil
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return
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case 1:
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for key := range n.childMap {
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n.childStr = key
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n.childNode = n.childMap[key]
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}
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n.childMap = nil
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n.optimize()
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return
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}
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children := make(map[string]*Node[T], len(n.childMap)) // avoid map reallocate memory
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for key := range n.childMap {
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child := n.childMap[key]
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if child == nil {
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continue
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}
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key = strClone(key)
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children[key] = child
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child.optimize()
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}
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n.childMap = children
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}
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func strClone(key string) string {
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switch key { // try to save string's memory
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case wildcard:
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key = wildcard
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case dotWildcard:
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key = dotWildcard
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case complexWildcard:
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key = complexWildcard
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case domainStep:
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key = domainStep
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default:
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key = strings.Clone(key)
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}
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return key
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}
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func (n *Node[T]) isEmpty() bool {
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if n == nil || n.inited == false {
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return true
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}
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return false
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}
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func (n *Node[T]) setData(data T) {
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n.data = data
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n.inited = true
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}
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func (n *Node[T]) Data() T {
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return n.data
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}
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func newNode[T any]() *Node[T] {
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return &Node[T]{}
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}
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