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package core
import (
"bytes"
"io/ioutil"
)
// MemoryObject on memory Object implementation
type MemoryObject struct {
t ObjectType
h Hash
cont []byte
sz int64
}
// 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 *MemoryObject) Hash() Hash {
if o.h == ZeroHash && int64(len(o.cont)) == o.sz {
o.h = ComputeHash(o.t, o.cont)
}
return o.h
}
// Type return the ObjectType
func (o *MemoryObject) Type() ObjectType { return o.t }
// SetType sets the ObjectType
func (o *MemoryObject) SetType(t ObjectType) { o.t = t }
// Size return the size of the object
func (o *MemoryObject) Size() int64 { return o.sz }
// SetSize set the object size, a content of the given size should be written
// afterwards
func (o *MemoryObject) SetSize(s int64) { o.sz = s }
// Reader returns a ObjectReader used to read the object's content.
func (o *MemoryObject) Reader() (ObjectReader, error) {
return ioutil.NopCloser(bytes.NewBuffer(o.cont)), nil
}
// Writer returns a ObjectWriter used to write the object's content.
func (o *MemoryObject) Writer() (ObjectWriter, error) {
return o, nil
}
func (o *MemoryObject) 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
// ObjectWriter.
func (o *MemoryObject) Close() error { return nil }
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