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101 lines
2.1 KiB
101 lines
2.1 KiB
package roaring
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import "container/heap"
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/////////////
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// The priorityQueue is used to keep Bitmaps sorted.
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////////////
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type item struct {
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value *Bitmap
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index int
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}
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type priorityQueue []*item
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func (pq priorityQueue) Len() int { return len(pq) }
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func (pq priorityQueue) Less(i, j int) bool {
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return pq[i].value.GetSizeInBytes() < pq[j].value.GetSizeInBytes()
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}
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func (pq priorityQueue) Swap(i, j int) {
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pq[i], pq[j] = pq[j], pq[i]
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pq[i].index = i
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pq[j].index = j
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}
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func (pq *priorityQueue) Push(x interface{}) {
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n := len(*pq)
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item := x.(*item)
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item.index = n
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*pq = append(*pq, item)
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}
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func (pq *priorityQueue) Pop() interface{} {
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old := *pq
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n := len(old)
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item := old[n-1]
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item.index = -1 // for safety
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*pq = old[0 : n-1]
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return item
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}
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func (pq *priorityQueue) update(item *item, value *Bitmap) {
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item.value = value
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heap.Fix(pq, item.index)
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}
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/////////////
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// The containerPriorityQueue is used to keep the containers of various Bitmaps sorted.
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////////////
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type containeritem struct {
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value *Bitmap
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keyindex int
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index int
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}
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type containerPriorityQueue []*containeritem
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func (pq containerPriorityQueue) Len() int { return len(pq) }
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func (pq containerPriorityQueue) Less(i, j int) bool {
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k1 := pq[i].value.highlowcontainer.getKeyAtIndex(pq[i].keyindex)
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k2 := pq[j].value.highlowcontainer.getKeyAtIndex(pq[j].keyindex)
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if k1 != k2 {
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return k1 < k2
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}
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c1 := pq[i].value.highlowcontainer.getContainerAtIndex(pq[i].keyindex)
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c2 := pq[j].value.highlowcontainer.getContainerAtIndex(pq[j].keyindex)
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return c1.getCardinality() > c2.getCardinality()
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}
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func (pq containerPriorityQueue) Swap(i, j int) {
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pq[i], pq[j] = pq[j], pq[i]
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pq[i].index = i
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pq[j].index = j
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}
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func (pq *containerPriorityQueue) Push(x interface{}) {
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n := len(*pq)
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item := x.(*containeritem)
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item.index = n
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*pq = append(*pq, item)
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}
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func (pq *containerPriorityQueue) Pop() interface{} {
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old := *pq
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n := len(old)
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item := old[n-1]
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item.index = -1 // for safety
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*pq = old[0 : n-1]
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return item
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}
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//func (pq *containerPriorityQueue) update(item *containeritem, value *Bitmap, keyindex int) {
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// item.value = value
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// item.keyindex = keyindex
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// heap.Fix(pq, item.index)
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//}
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