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path.go
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path.go
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/*
* Copyright (c) 2002-2020 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package bolt
import (
"github.com/neo4j/neo4j-go-driver/v4/neo4j/dbtype"
)
// Intermediate representation of part of path
type relNode struct {
id int64
name string
props map[string]interface{}
}
// buildPath builds a path from Bolt representation
func buildPath(nodes []dbtype.Node, relNodes []*relNode, indexes []int) dbtype.Path {
num := len(indexes) / 2
if num == 0 {
return dbtype.Path{}
}
rels := make([]dbtype.Relationship, 0, num)
i := 0
n1 := nodes[0]
for num > 0 {
relni := indexes[i]
i++
n2i := indexes[i]
i++
num--
var reln *relNode
var n1start bool
if relni < 0 {
reln = relNodes[(relni*-1)-1]
} else {
reln = relNodes[relni-1]
n1start = true
}
n2 := nodes[n2i]
rel := dbtype.Relationship{
Id: reln.id,
Type: reln.name,
Props: reln.props,
}
if n1start {
rel.StartId = n1.Id
rel.EndId = n2.Id
} else {
rel.StartId = n2.Id
rel.EndId = n1.Id
}
rels = append(rels, rel)
n1 = n2
}
return dbtype.Path{Nodes: nodes, Relationships: rels}
}