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directoryReader.go
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directoryReader.go
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package factory
import (
"errors"
"os"
)
type directoryReader struct {
}
// NewDirectoryReader returns a new instance of directoryReader
func NewDirectoryReader() *directoryReader {
return &directoryReader{}
}
// ListFilesAsString will return all files' names from a directory in a slice
func (dr *directoryReader) ListFilesAsString(directoryPath string) ([]string, error) {
_, filesNames, err := dr.listDirectoriesAndFilesAsString(directoryPath)
if err != nil {
return nil, err
}
if len(filesNames) == 0 {
return nil, errors.New("no file in provided directory")
}
return filesNames, nil
}
// ListDirectoriesAsString will return all directories' names in the directory as a string slice
func (dr *directoryReader) ListDirectoriesAsString(directoryPath string) ([]string, error) {
directoriesNames, _, err := dr.listDirectoriesAndFilesAsString(directoryPath)
if err != nil {
return nil, err
}
if len(directoriesNames) == 0 {
return nil, errors.New("no sub-directory in provided directory")
}
return directoriesNames, nil
}
// ListAllAsString will return all files and directories names from the directory as a string slice
func (dr *directoryReader) ListAllAsString(directoryPath string) ([]string, error) {
directories, files, err := dr.listDirectoriesAndFilesAsString(directoryPath)
if err != nil {
return nil, err
}
filesNames := append(directories, files...)
if len(filesNames) == 0 {
return nil, errors.New("no file or directory in provided directory")
}
return filesNames, nil
}
func (dr *directoryReader) listDirectoriesAndFilesAsString(directoryPath string) ([]string, []string, error) {
files, err := dr.loadContent(directoryPath)
if err != nil {
return nil, nil, err
}
directoriesNames := make([]string, 0)
filesNames := make([]string, 0)
for _, file := range files {
if file.IsDir() {
directoriesNames = append(directoriesNames, file.Name())
continue
}
filesNames = append(filesNames, file.Name())
}
return directoriesNames, filesNames, nil
}
func (dr *directoryReader) loadContent(path string) ([]os.FileInfo, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
files, err := f.Readdir(allFiles)
if err != nil {
return nil, err
}
err = f.Close()
if err != nil {
return nil, err
}
return files, nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (dr *directoryReader) IsInterfaceNil() bool {
return dr == nil
}