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datum.go
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datum.go
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// Copyright (c) 2017 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 Software.
//
// 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 datums
import "fmt"
var (
errNumPointsNegative = fmt.Errorf("numPoints must be positive")
)
type synTS struct {
id int
data []float64
lastIdx int
}
func (ld *synTS) ID() int {
return ld.id
}
func (ld *synTS) Size() int {
return len(ld.data)
}
func (ld *synTS) Data() []float64 {
return ld.data
}
func (ld *synTS) Get(idx int) float64 {
idx = idx % len(ld.data)
if idx < 0 {
idx += len(ld.data)
}
return ld.data[idx]
}
func (ld *synTS) Next() float64 {
idx := (ld.lastIdx + 1) % len(ld.data)
if idx < 0 {
idx += len(ld.data)
}
ld.lastIdx = idx
return ld.data[idx]
}
// NewSyntheticTimeSeris generates a new SyntheticTimeSeris using the provided parameters.
func NewSyntheticTimeSeris(id int, numPoints int, fn TSGenFn) (SyntheticTimeSeries, error) {
if numPoints < 0 {
return nil, errNumPointsNegative
}
data := make([]float64, numPoints)
for i := 0; i < numPoints; i++ {
data[i] = fn(i)
}
return &synTS{
id: id,
data: data,
lastIdx: -1,
}, nil
}