FileInputStreamSource (Javascript Object Signing and Encryption (JOSE) with PKCS#11 v5.2.2)

```
public interface FileInputStreamSource
```
File input stream source.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  InputStream getInputSteam(String filename)
  Returns an input stream for the specified file.

- Method Detail
  - getInputSteam
```
InputStream getInputSteam(String filename)
```
    Returns an input stream for the specified file.
    
    Parameters:
    
    filename - The file name. Must not be null.
    
    Returns:
    
    The input stream, null if the file doesn't exist or couldn't be accessed.