@Override
public final void close() throws IOException {
try {
if (buffers == null) return;
// make local copy, then un-set early
final ByteBuffer[] bufs = buffers;
unsetBuffers();
if (clones != null) {
clones.remove(this);
}
if (isClone) return;
// for extra safety unset also all clones' buffers:
if (clones != null) {
for (Iterator<ByteBufferIndexInput> it = this.clones.keyIterator(); it.hasNext(); ) {
final ByteBufferIndexInput clone = it.next();
assert clone.isClone;
clone.unsetBuffers();
}
this.clones.clear();
}
for (final ByteBuffer b : bufs) {
freeBuffer(b);
}
} finally {
unsetBuffers();
}
}
@Override
public final ByteBufferIndexInput clone() {
final ByteBufferIndexInput clone = buildSlice((String) null, 0L, this.length);
try {
clone.seek(getFilePointer());
} catch (IOException ioe) {
throw new AssertionError(ioe);
}
return clone;
}
@Override
public void seek(long pos) throws IOException {
// necessary in case offset != 0 and pos < 0, but pos >= -offset
if (pos < 0L) {
throw new IllegalArgumentException("Seeking to negative position: " + this);
}
super.seek(pos + offset);
}
/** Builds the actual sliced IndexInput (may apply extra offset in subclasses). * */
protected ByteBufferIndexInput buildSlice(String sliceDescription, long offset, long length) {
if (buffers == null) {
throw new AlreadyClosedException("Already closed: " + this);
}
final ByteBuffer newBuffers[] = buildSlice(buffers, offset, length);
final String newResourceDescription =
(sliceDescription == null)
? toString()
: (toString() + " [slice=" + sliceDescription + "]");
final int ofs = (int) (offset & chunkSizeMask);
final ByteBufferIndexInput clone =
newCloneInstance(newResourceDescription, newBuffers, ofs, length);
clone.isClone = true;
// register the new clone in our clone list to clean it up on closing:
if (clones != null) {
this.clones.put(clone, Boolean.TRUE);
}
return clone;
}