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package memory
import (
"bytes"
"io/ioutil"
"gopkg.in/src-d/go-git.v4/core"
)
// Object on memory core.Object implementation
type Object struct {
t core.ObjectType
h core.Hash
cont []byte
sz int64
}
// NewObject creates a new object with the given type and content
func NewObject(typ core.ObjectType, size int64, cont []byte) *Object {
return &Object{
t: typ,
h: core.ComputeHash(typ, cont),
cont: cont,
sz: int64(len(cont)),
}
}
// Hash return the object Hash, the hash is calculated on-the-fly the first
// time is called, the subsequent calls the same Hash is returned even if the
// type or the content has changed. The Hash is only generated if the size of
// the content is exactly the Object.Size
func (o *Object) Hash() core.Hash {
if o.h == core.ZeroHash && int64(len(o.cont)) == o.sz {
o.h = core.ComputeHash(o.t, o.cont)
}
return o.h
}
// Type return the core.ObjectType
func (o *Object) Type() core.ObjectType { return o.t }
// SetType sets the core.ObjectType
func (o *Object) SetType(t core.ObjectType) { o.t = t }
// Size return the size of the object
func (o *Object) Size() int64 { return o.sz }
// SetSize set the object size, the given size should be written afterwards
func (o *Object) SetSize(s int64) { o.sz = s }
// Content returns the contents of the object
func (o *Object) Content() []byte { return o.cont }
// Reader returns a core.ObjectReader used to read the object's content.
func (o *Object) Reader() (core.ObjectReader, error) {
return ioutil.NopCloser(bytes.NewBuffer(o.cont)), nil
}
// Writer returns a core.ObjectWriter used to write the object's content.
func (o *Object) Writer() (core.ObjectWriter, error) {
return o, nil
}
func (o *Object) Write(p []byte) (n int, err error) {
o.cont = append(o.cont, p...)
return len(p), nil
}
// Close releases any resources consumed by the object when it is acting as a
// core.ObjectWriter.
func (o *Object) Close() error { return nil }
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