59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// Package nodemap provides a schema registry index type.
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package nodemap
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import (
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"zombiezen.com/go/capnproto2"
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"zombiezen.com/go/capnproto2/internal/schema"
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"zombiezen.com/go/capnproto2/schemas"
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)
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// Map is a lazy index of a registry.
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// The zero value is an index of the default registry.
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type Map struct {
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reg *schemas.Registry
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nodes map[uint64]schema.Node
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}
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func (m *Map) registry() *schemas.Registry {
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if m.reg != nil {
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return m.reg
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}
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return &schemas.DefaultRegistry
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}
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func (m *Map) UseRegistry(reg *schemas.Registry) {
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m.reg = reg
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m.nodes = make(map[uint64]schema.Node)
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}
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// Find returns the node for the given ID.
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func (m *Map) Find(id uint64) (schema.Node, error) {
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if n := m.nodes[id]; n.IsValid() {
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return n, nil
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}
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data, err := m.registry().Find(id)
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if err != nil {
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return schema.Node{}, err
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}
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msg, err := capnp.Unmarshal(data)
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if err != nil {
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return schema.Node{}, err
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}
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req, err := schema.ReadRootCodeGeneratorRequest(msg)
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if err != nil {
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return schema.Node{}, err
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}
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nodes, err := req.Nodes()
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if err != nil {
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return schema.Node{}, err
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}
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if m.nodes == nil {
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m.nodes = make(map[uint64]schema.Node)
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}
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for i := 0; i < nodes.Len(); i++ {
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n := nodes.At(i)
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m.nodes[n.Id()] = n
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}
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return m.nodes[id], nil
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}
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