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transformations.go
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transformations.go
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// Package htsrequest provides operations for parsing htsget-related
// parameters from the HTTP request, and performing validation and
// transformation
//
// Module transformations defines operations for transforming the raw string
// parsed from the HTTP request into a mature value that is usable by the program
package htsrequest
import (
"fmt"
"strconv"
"strings"
)
// ParamTransformer transforms request parameters on query string to expected datatype
type ParamTransformer struct{}
// NewParamTransformer instantiates a new ParamTransformer object
func NewParamTransformer() *ParamTransformer {
return new(ParamTransformer)
}
// NoTransform performs no param transformation, returning the exact same value
func (t *ParamTransformer) NoTransform(s string) (string, string) {
return s, ""
}
// TransformStringUppercase transforms a param with lowercase characters to all
// uppercase
func (t *ParamTransformer) TransformStringUppercase(s string) (string, string) {
return strings.ToUpper(s), ""
}
// TransformStringLowercase transforms a param with uppercase characters to all
// lowercase
func (t *ParamTransformer) TransformStringLowercase(s string) (string, string) {
return strings.ToLower(s), ""
}
// TransformStringToInt converts a request param to integer datatype
func (t *ParamTransformer) TransformStringToInt(s string) (int, string) {
msg := ""
value, err := strconv.Atoi(s)
if err != nil {
msg = fmt.Sprintf("Could not parse value: '%s', integer expected", s)
}
return value, msg
}
// TransformSplit splits a string into a list of strings, delimited by comma
func (t *ParamTransformer) TransformSplit(s string) ([]string, string) {
return strings.Split(s, ","), ""
}
// TransformSplitAndUppercase splits a string into a list of strings, and
// uppercases each element
func (t *ParamTransformer) TransformSplitAndUppercase(s string) ([]string, string) {
sList, _ := t.TransformSplit(s)
for i := 0; i < len(sList); i++ {
sList[i] = strings.ToUpper(sList[i])
}
return sList, ""
}