## org.apache.lucene.store
Class _TestHelper

    java.lang.Object
      org.apache.lucene.store._TestHelper

    public class _TestHelper

extends Object

This class provides access to package-level features defined in the store package. It is used for testing only.

Constructor Summary
`_TestHelper()`

Method Summary
`static boolean` `isSimpleFSIndexInput(IndexInput is)` Returns true if the instance of the provided input stream is actually an SimpleFSIndexInput.
`static boolean` `isSimpleFSIndexInputClone(IndexInput is)` Returns true if the provided input stream is an SimpleFSIndexInput and is a clone, that is it does not own its underlying file descriptor.
`static boolean` `isSimpleFSIndexInputOpen(IndexInput is)` Given an instance of SimpleFSDirectory.SimpleFSIndexInput, this method returns true if the underlying file descriptor is valid, and false otherwise.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### _TestHelper

    public _TestHelper()

Method Detail

### isSimpleFSIndexInput

    public static boolean isSimpleFSIndexInput(IndexInput is)

  Returns true if the instance of the provided input stream is actually an SimpleFSIndexInput.

### isSimpleFSIndexInputClone

    public static boolean isSimpleFSIndexInputClone(IndexInput is)

  Returns true if the provided input stream is an SimpleFSIndexInput and is a clone, that is it does not own its underlying file descriptor.

### isSimpleFSIndexInputOpen

    public static boolean isSimpleFSIndexInputOpen(IndexInput is)
                                            throws IOException

  Given an instance of SimpleFSDirectory.SimpleFSIndexInput, this method returns true if the underlying file descriptor is valid, and false otherwise. This can be used to determine if the OS file has been closed. The descriptor becomes invalid when the non-clone instance of the SimpleFSIndexInput that owns this descriptor is closed. However, the descriptor may possibly become invalid in other ways as well.

  Throws:
    `IOException`