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named.go
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named.go
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// Copyright ©2017 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rbase
import (
"fmt"
"reflect"
"go-hep.org/x/hep/groot/rbytes"
"go-hep.org/x/hep/groot/root"
"go-hep.org/x/hep/groot/rtypes"
"go-hep.org/x/hep/groot/rvers"
)
// The TNamed class is the base class for all named ROOT classes
// A TNamed contains the essential elements (name, title)
// to identify a derived object in containers, directories and files.
// Most member functions defined in this base class are in general
// overridden by the derived classes.
type Named struct {
obj Object
name string
title string
}
func NewNamed(name, title string) *Named {
return &Named{
obj: *NewObject(),
name: name,
title: title,
}
}
func (*Named) RVersion() int16 {
return rvers.Named
}
// Name returns the name of the instance
func (n *Named) Name() string {
return n.name
}
// Title returns the title of the instance
func (n *Named) Title() string {
return n.title
}
func (n *Named) SetName(name string) { n.name = name }
func (n *Named) SetTitle(title string) { n.title = title }
func (*Named) Class() string {
return "TNamed"
}
func (n *Named) UID() uint32 {
return n.obj.UID()
}
func (n *Named) Sizeof() int32 {
return tstringSizeof(n.name) + tstringSizeof(n.title)
}
// tstringSizeof returns the size in bytes of the TString structure.
func tstringSizeof(v string) int32 {
n := int32(len(v))
if n > 254 {
return n + 1 + 4
}
return n + 1
}
func (n *Named) UnmarshalROOT(r *rbytes.RBuffer) error {
if r.Err() != nil {
return r.Err()
}
beg := r.Pos()
vers, pos, bcnt := r.ReadVersion(n.Class())
if vers > rvers.Named {
panic(fmt.Errorf("rbase: invalid named version=%d > %d", vers, rvers.Named))
}
if err := n.obj.UnmarshalROOT(r); err != nil {
return r.Err()
}
n.name = r.ReadString()
n.title = r.ReadString()
r.CheckByteCount(pos, bcnt, beg, n.Class())
return r.Err()
}
func (n *Named) MarshalROOT(w *rbytes.WBuffer) (int, error) {
if w.Err() != nil {
return 0, w.Err()
}
pos := w.WriteVersion(n.RVersion())
if _, err := n.obj.MarshalROOT(w); err != nil {
return 0, err
}
w.WriteString(n.name)
w.WriteString(n.title)
return w.SetByteCount(pos, n.Class())
}
func init() {
f := func() reflect.Value {
o := NewNamed("", "")
return reflect.ValueOf(o)
}
rtypes.Factory.Add("TNamed", f)
}
var (
_ root.Object = (*Named)(nil)
_ root.UIDer = (*Named)(nil)
_ root.Named = (*Named)(nil)
_ rbytes.Marshaler = (*Named)(nil)
_ rbytes.Unmarshaler = (*Named)(nil)
)