package org.apache.lucene.store;
import java.io.RandomAccessFile;
import java.io.IOException;
/** This class provides access to package-level features defined in the
* store package. It is used for testing only.
*/
public class _TestHelper {
/** Returns true if the instance of the provided input stream is actually
* an FSInputStream.
*/
public static boolean isFSInputStream(InputStream is) {
return is instanceof FSInputStream;
}
/** Returns true if the provided input stream is an FSInputStream and
* is a clone, that is it does not own its underlying file descriptor.
*/
public static boolean isFSInputStreamClone(InputStream is) {
if (isFSInputStream(is)) {
return ((FSInputStream) is).isClone;
} else {
return false;
}
}
/** Given an instance of FSDirectory.FSInputStream, 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
* FSInputStream that owns this descriptor is closed. However, the
* descriptor may possibly become invalid in other ways as well.
*/
public static boolean isFSInputStreamOpen(InputStream is)
throws IOException
{
if (isFSInputStream(is)) {
FSInputStream fis = (FSInputStream) is;
return fis.isFDValid();
} else {
return false;
}
}
}
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