/**
* Check that a record entry exists in the entry tree.
*
* @param txn a non null transaction
* @param entryID The entry ID which forms the key.
* @return True if an entry with entryID exists
* @throws StorageRuntimeException If an error occurs in the storage.
*/
public boolean containsEntryID(ReadableTransaction txn, EntryID entryID) {
checkNotNull(txn, "txn must not be null");
checkNotNull(entryID, "entryID must not be null");
try (final Cursor<ByteString, ByteString> cursor = txn.openCursor(getName())) {
return cursor.positionToKey(entryID.toByteString());
}
}
/**
* Fetch a record from the entry tree.
*
* @param txn a non null transaction
* @param entryID The desired entry ID which forms the key.
* @return The requested entry, or null if there is no such record.
* @throws DirectoryException If a problem occurs while getting the entry.
* @throws StorageRuntimeException If an error occurs in the storage.
*/
public Entry get(ReadableTransaction txn, EntryID entryID)
throws DirectoryException, StorageRuntimeException {
try {
return get0(txn.read(getName(), entryID.toByteString()));
} catch (Exception e) {
throw new DirectoryException(
DirectoryServer.getServerErrorResultCode(), ERR_ENTRY_DATABASE_CORRUPT.get(entryID));
}
}
@Override
public ByteString generateKey(String data) {
EntryID entryID = new EntryID(Long.parseLong(data));
return entryID.toByteString();
}
/**
* Remove a record from the entry tree.
*
* @param txn a non null transaction
* @param entryID The entry ID which forms the key.
* @return true if the entry was removed, false if it was not.
* @throws StorageRuntimeException If an error occurs in the storage.
*/
boolean remove(WriteableTransaction txn, EntryID entryID) throws StorageRuntimeException {
return txn.delete(getName(), entryID.toByteString());
}
public void put(WriteableTransaction txn, EntryID entryID, ByteSequence encodedEntry)
throws StorageRuntimeException, DirectoryException {
Reject.ifNull(txn, "txn must not be null.");
txn.put(getName(), entryID.toByteString(), encodedEntry);
}