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826f6ce377
* Move ETL to erigon-lib * Add coded * Remove walk Co-authored-by: Alex Sharp <alexsharp@Alexs-MacBook-Pro.local>
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
/*
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Copyright 2021 Erigon contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package etl
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import (
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"bytes"
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"github.com/ledgerwatch/erigon-lib/kv"
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)
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type HeapElem struct {
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Key []byte
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TimeIdx int
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Value []byte
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}
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type Heap struct {
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comparator kv.CmpFunc
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elems []HeapElem
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}
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func (h Heap) Len() int {
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return len(h.elems)
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}
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func (h Heap) Less(i, j int) bool {
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if h.comparator != nil {
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if c := h.comparator(h.elems[i].Key, h.elems[j].Key, h.elems[i].Value, h.elems[j].Value); c != 0 {
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return c < 0
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}
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return h.elems[i].TimeIdx < h.elems[j].TimeIdx
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}
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if c := bytes.Compare(h.elems[i].Key, h.elems[j].Key); c != 0 {
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return c < 0
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}
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return h.elems[i].TimeIdx < h.elems[j].TimeIdx
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}
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func (h Heap) Swap(i, j int) {
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h.elems[i], h.elems[j] = h.elems[j], h.elems[i]
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}
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func (h *Heap) Push(x interface{}) {
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// Push and Pop use pointer receivers because they modify the slice's length,
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// not just its contents.
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h.elems = append(h.elems, x.(HeapElem))
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}
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func (h *Heap) Pop() interface{} {
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old := h.elems
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n := len(old)
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x := old[n-1]
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h.elems = old[0 : n-1]
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return x
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}
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