Add: FileUtils

FileUtils.go

@@ -0,0 +1,53 @@
+package golanghelper
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+)
+
+type FileUtils struct {
+}
+
+func (f *FileUtils) CopyFile(srcFilePath, destFilePath string, isOverwrite bool) (err error) {
+	var srcFileInfo os.FileInfo
+	srcFileInfo, err = os.Stat(srcFilePath)
+	if err != nil {
+		return
+	}
+	if !srcFileInfo.Mode().IsRegular() {
+		return errors.New(fmt.Sprintf("%s is not a regular file", srcFileInfo.Name()))
+	}
+
+	var isNotExist bool
+	_, err = os.Stat(destFilePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			isNotExist = true
+		} else {
+			return
+		}
+	}
+
+	var destFile *os.File
+	if isNotExist == false && isOverwrite == false {
+		return errors.New("File already exists")
+	}
+
+	destFile, err = os.Create(destFilePath)
+	if err != nil {
+		return
+	}
+	defer destFile.Close()
+
+	sourceFile, err := os.Open(srcFilePath)
+	if err != nil {
+		return
+	}
+	defer sourceFile.Close()
+
+	_, err = io.Copy(destFile, sourceFile)
+
+	return
+}