使用枚举来表示错误消息 – 这是一个好习惯吗？

这是我在枚举文件中的示例：

public enum ZipErrorType {

// START: define exception messages (alphabetical order)
EMPTY_FILE_NAME_IN_LIST {
    public String toString() {
        return "One or more null/empty filename(s) found";
    }
},FILE_DOESNT_EXIST {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] does not exist";
    }
},FILE_LIST_IS_NULL {
    public String toString() {
        return "File list is null/empty";
    }
},FILENAME_NOT_ABSOLUTE {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] is not absolute";
    }
},MUST_BE_DIR {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] must be a directory";
    }
},MUST_BE_FILE {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] must be a file";
    }
},NULL_OR_EMPTY {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] is null/empty";
    }
},OUTPUT_FILE_ALREADY_EXISTS {
    public String who(String sThisFile) {
        return "[" + sThisFile + "] already exists";
    }
},OUTPUT_FILENAME_EMPTY {
    public String toString() {
        return "Output filename is null/empty";
    }
},OUTPUT_PATH_EMPTY {
    public String toString() {
        return "Output path is null/empty";
    }
},// END: define exception messages

NONE {};

public String who(String sThisFile) { return ""; }
}

然后在我的程序中我有如下代码：

private static ZipErrorType getFileErrorsIfAny(String sFilename,boolean shouldBeFile) {

    // check if given filename is absolute
    File file = new File(sFilename);
    if (!file.isAbsolute()) {
        return ZipErrorType.FILENAME_NOT_ABSOLUTE;
    }

    // check if file exists
    if (!file.exists()) {
        return ZipErrorType.FILE_DOESNT_EXIST;
    }

    // check if corresponding file is a file when it shouldn't be...
    if (file.isFile() && !shouldBeFile) {
        return ZipErrorType.MUST_BE_DIR;
    }
    // ...or a directory when it should be a file
    else if (file.isDirectory() && shouldBeFile) {
        return ZipErrorType.MUST_BE_FILE;
    }

    return ZipErrorType.NONE;
}

……以及我如何利用我的枚举的一个例子：

// check input files
    for (String sFile : files) {
        if (sFile == null || sFile.trim().length() == 0) {
            throw new NullPointerException("One or more filename is null/empty");
        }

        errorIfAny = getFileErrorsIfAny(sFile.trim(),true); 
        if (!errorIfAny.equals(ZipErrorType.NONE)) {
            throw new ZipInputException(errorIfAny.who(sFile.trim()));
        }
    }

现在我知道单凭这些代码片段很难判断,但从一般的角度来看,这是否正常？我正在做什么不值得的麻烦,有没有办法改善这一点？