/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

parcel Lucy;

/** Utilities for parsing, interpreting and generating index file names.
 */
inert class Lucy::Util::IndexFileNames cnick IxFileNames {

    /** Skip past the first instance of an underscore in the CharBuf, then
     * attempt to decode a base 36 number.  For example, "snapshot_5.json"
     * yields 5, and "seg_a1" yields 27.
     *
     * @return a generation number, or 0 if no number can be extracted.
     */
    inert uint64_t
    extract_gen(const CharBuf *name);

    /** Return the name of the latest generation snapshot file in the Folder,
     * or NULL if no such file exists.
     */
    inert incremented nullable CharBuf*
    latest_snapshot(Folder *folder);

    /** Split the <code>path</code> on '/' and assign the last component to
     * <code>target</code>, which will remain valid only as long as
     * <code>path</code> is unmodified.  Trailing slashes will be stripped.
     *
     * @param target The target string to assign to.
     * @return target, allowing an assignment idiom.
     */
    inert incremented ZombieCharBuf*
    local_part(const CharBuf *path, ZombieCharBuf *target);
}