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path.go
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path.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package mtree
import (
"fmt"
"hash/fnv"
"math/big"
"strings"
)
type MPathProvider interface{}
// MPath type struct
type MPath []uint64
// NewMPath from mpath
func NewMPath(mpath ...uint64) MPath {
return MPath(mpath)
}
// NewMPathFromMPath returns a copy of a slice
func NewMPathFromMPath(b MPath) MPath {
c := make(MPath, len(b))
copy(c, b)
return c
}
// String representation of a mpath
func (m MPath) String() string {
if len(m) == 0 {
return ""
}
var b strings.Builder
fmt.Fprintf(&b, "%d", m[0])
for i := 1; i < len(m); i++ {
fmt.Fprintf(&b,".%d", m[i])
}
return b.String()
}
func (m MPath) Hash() uint32 {
h := fnv.New32a()
h.Write([]byte(m.String()))
return h.Sum32()
}
func (m MPath) Index() uint64 {
return m[len(m)-1]
}
// Sibling of a specific path
func (m MPath) Sibling() MPath {
spath := make([]uint64, len(m)-1)
copy(spath, m[0:len(m)-1])
return append(spath, m[len(m)-1]+1)
}
// Parent of a specific path
func (m MPath) Parent() MPath {
return m[0 : len(m)-1]
}
func (m MPath) Parents() []MPath {
var mpathes []MPath
for i := 0; i < len(m)-1; i++ {
mpathes = append(mpathes, m[0:i+1])
}
return mpathes
}
func (m MPath) CommonRoot(m2 MPath) MPath {
var root MPath
for i := 0; i < len(m) && i < len(m2); i++ {
if m[i] == m2[i] {
root = append(root, m[i])
}
}
return root
}
// Rat representation of a materialized path
func (m MPath) Rat() *Rat {
id := new(big.Float)
//id.SetPrec(512)
id.SetRat(NewFractionFromMaterializedPath(m...).Decimal())
b, _ := id.GobEncode()
// Getting Matrix ID and SID Mantissa
rat := new(Rat)
rat.GobDecode(b)
return rat
}