/**
* @return the first key in the file. May be null if file has no entries. Note that this is not
* the first row key, but rather the byte form of the first KeyValue.
*/
@Override
public byte[] getFirstKey() {
if (dataBlockIndexReader == null) {
throw new BlockIndexNotLoadedException();
}
return dataBlockIndexReader.isEmpty() ? null : dataBlockIndexReader.getRootBlockKey(0);
}
/**
* @return the total heap size of data and meta block indexes in bytes. Does not take into account
* non-root blocks of a multilevel data index.
*/
public long indexSize() {
return (dataBlockIndexReader != null ? dataBlockIndexReader.heapSize() : 0)
+ ((metaBlockIndexReader != null) ? metaBlockIndexReader.heapSize() : 0);
}
