96 lines
2.3 KiB
Go
96 lines
2.3 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package collector
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import (
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"container/heap"
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"github.com/blevesearch/bleve/search"
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)
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type collectStoreHeap struct {
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heap search.DocumentMatchCollection
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compare collectorCompare
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}
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func newStoreHeap(capacity int, compare collectorCompare) *collectStoreHeap {
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rv := &collectStoreHeap{
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heap: make(search.DocumentMatchCollection, 0, capacity),
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compare: compare,
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}
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heap.Init(rv)
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return rv
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}
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func (c *collectStoreHeap) AddNotExceedingSize(doc *search.DocumentMatch,
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size int) *search.DocumentMatch {
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c.add(doc)
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if c.Len() > size {
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return c.removeLast()
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}
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return nil
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}
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func (c *collectStoreHeap) add(doc *search.DocumentMatch) {
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heap.Push(c, doc)
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}
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func (c *collectStoreHeap) removeLast() *search.DocumentMatch {
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return heap.Pop(c).(*search.DocumentMatch)
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}
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func (c *collectStoreHeap) Final(skip int, fixup collectorFixup) (search.DocumentMatchCollection, error) {
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count := c.Len()
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size := count - skip
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if size <= 0 {
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return make(search.DocumentMatchCollection, 0), nil
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}
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rv := make(search.DocumentMatchCollection, size)
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for i := size - 1; i >= 0; i-- {
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doc := heap.Pop(c).(*search.DocumentMatch)
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rv[i] = doc
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err := fixup(doc)
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if err != nil {
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return nil, err
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}
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}
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return rv, nil
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}
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// heap interface implementation
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func (c *collectStoreHeap) Len() int {
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return len(c.heap)
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}
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func (c *collectStoreHeap) Less(i, j int) bool {
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so := c.compare(c.heap[i], c.heap[j])
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return -so < 0
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}
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func (c *collectStoreHeap) Swap(i, j int) {
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c.heap[i], c.heap[j] = c.heap[j], c.heap[i]
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}
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func (c *collectStoreHeap) Push(x interface{}) {
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c.heap = append(c.heap, x.(*search.DocumentMatch))
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}
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func (c *collectStoreHeap) Pop() interface{} {
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var rv *search.DocumentMatch
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rv, c.heap = c.heap[len(c.heap)-1], c.heap[:len(c.heap)-1]
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return rv
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}
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