graphml

ExampleWrite shows a GraphML round-trip: marshal a directed, weighted graph to XML with Write, then unmarshal it back with ReadInto and confirm the structure survived.

package main

import (
	"bytes"
	"fmt"

	"github.com/FlavioCFOliveira/GoGraph/graph/adjlist"
	"github.com/FlavioCFOliveira/GoGraph/graph/io/graphml"
)

func main() {
	src := adjlist.New[string, int64](adjlist.Config{Directed: true})
	_ = src.AddEdge("a", "b", 7)
	_ = src.AddEdge("b", "c", 9)

	var buf bytes.Buffer
	if err := graphml.Write(&buf, src); err != nil {
		panic(err)
	}

	dst, edges, err := graphml.ReadInto(&buf)
	if err != nil {
		panic(err)
	}

	fmt.Println("edges read:", edges)
	fmt.Println("order:", dst.Order())
	fmt.Println("size:", dst.Size())
	fmt.Println("a->b:", dst.HasEdge("a", "b"))
}

Output:
edges read: 2
order: 3
size: 2
a->b: true

ExampleWriteWithProps shows the labelled-property-graph round-trip: WriteWithProps serialises node properties as <data> elements and ReadWithProps restores them, so a typed property recovers its value.

package main

import (
	"bytes"
	"fmt"

	"github.com/FlavioCFOliveira/GoGraph/graph/adjlist"
	"github.com/FlavioCFOliveira/GoGraph/graph/io/graphml"
	"github.com/FlavioCFOliveira/GoGraph/graph/lpg"
)

func main() {
	src := lpg.New[string, int64](adjlist.Config{Directed: true})
	_ = src.AddEdge("alice", "bob", 1)
	_ = src.SetNodeProperty("alice", "age", lpg.Int64Value(30))

	var buf bytes.Buffer
	if err := graphml.WriteWithProps(&buf, src); err != nil {
		panic(err)
	}

	dst, _, err := graphml.ReadWithProps(&buf)
	if err != nil {
		panic(err)
	}

	got, ok := dst.GetNodeProperty("alice", "age")
	age, _ := got.Int64()
	fmt.Println("alice has age:", ok)
	fmt.Println("alice.age:", age)
}

Output:
alice has age: true
alice.age: 30