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slice.go
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slice.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Softwarw.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package docs
import (
"errors"
"github.com/m3db/m3/src/m3ninx/doc"
"github.com/m3db/m3/src/m3ninx/index"
"github.com/m3db/m3/src/m3ninx/postings"
)
var (
errDocNotFound = errors.New("doc not found")
)
var _ Reader = (*SliceReader)(nil)
var _ index.MetadataRetriever = (*SliceReader)(nil)
// SliceReader is a docs slice reader for use with documents
// stored in memory.
type SliceReader struct {
docs []doc.Metadata
}
// NewSliceReader returns a new docs slice reader.
func NewSliceReader(docs []doc.Metadata) *SliceReader {
return &SliceReader{docs: docs}
}
// Len returns the number of documents in the slice reader.
func (r *SliceReader) Len() int {
return len(r.docs)
}
// Read returns a document from the docs slice reader.
func (r *SliceReader) Read(id postings.ID) (doc.Metadata, error) {
idx := int(id)
if idx < 0 || idx >= len(r.docs) {
return doc.Metadata{}, errDocNotFound
}
return r.docs[idx], nil
}
// Metadata implements MetadataRetriever and reads the document with postings ID.
func (r *SliceReader) Metadata(id postings.ID) (doc.Metadata, error) {
return r.Read(id)
}
// Iter returns a docs iterator.
func (r *SliceReader) Iter() index.IDDocIterator {
postingsIter := postings.NewRangeIterator(0, postings.ID(r.Len()))
return index.NewIDDocIterator(r, postingsIter)
}