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sparse.go
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sparse.go
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// Copyright 2019 Nick Poorman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cast
import "fmt"
const inconsistentDataTypesErrMsg = "inconsistent data types for elements, expecting %v to be of type (%T)"
// SparseCollectionToInterface casts a slice of interfaces to an interface of the correct type
// for the provided sparse collection.
// This should be used for sparse as it should be faster for larger arrays.
func SparseCollectionToInterface(elms []interface{}, indexes []int, size int) (interface{}, error) {
if len(elms) == 0 {
return nil, nil
}
// find the first one that is not nil
var first interface{}
for i := range elms {
if elms[i] != nil {
first = elms[i]
break
}
}
if first == nil {
return nil, nil
}
var ok bool
switch v := first.(type) {
case bool:
arr := make([]bool, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(bool); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case int8:
arr := make([]int8, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(int8); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case int16:
arr := make([]int16, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(int16); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case int32:
arr := make([]int32, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(int32); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case int64:
arr := make([]int64, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(int64); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case uint8:
arr := make([]uint8, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(uint8); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case uint16:
arr := make([]uint16, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(uint16); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case uint32:
arr := make([]uint32, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(uint32); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case uint64:
arr := make([]uint64, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(uint64); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case float32:
arr := make([]float32, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(float32); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case float64:
arr := make([]float64, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(float64); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case string:
arr := make([]string, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(string); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case uint:
arr := make([]uint, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
if arr[idx], ok = e.(uint); !ok {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
}
return arr, nil
case int:
arr := make([]int64, size)
for i, idx := range indexes {
e := elms[i]
if e == nil {
continue
}
vv, okk := e.(int)
if !okk {
return nil, fmt.Errorf(inconsistentDataTypesErrMsg, e, v)
}
arr[idx] = int64(vv)
}
return arr, nil
default:
return nil, fmt.Errorf("dataframe/sparse: invalid data type for %v (%T)", elms, v)
}
}