DataSource.ReaderOpener (OREKIT 12.1.2 API)

Enclosing class:

DataSource
```
public static interface DataSource.ReaderOpener
```
Interface for lazy-opening a characters stream one time.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  Reader openOnce()
  Open the stream once.

- Method Detail
  - openOnce
```
Reader openOnce()
         throws IOException
```
    Open the stream once.
    Beware that this interface is only intended for lazy opening a stream, i.e. to delay this opening (or not open the stream at all). It is not intended to open the stream several times. Some implementations may fail if an attempt to open a stream several times is made. This is particularly true for network-based streams.
    
    Returns:
    
    opened stream
    
    Throws:
    
    IOException - if stream cannot be opened