/* 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;

class Lucy::Index::DeletionsReader nickname DelReader
    inherits Lucy::Index::DataReader {

    inert DeletionsReader*
    init(DeletionsReader *self, Schema *schema = NULL, Folder *folder = NULL,
         Snapshot *snapshot = NULL, Vector *segments = NULL,
         int32_t seg_tick = -1);

    /** Return the number of docs which have been marked as deleted in this
     * segment.
     */
    abstract int32_t
    Del_Count(DeletionsReader *self);

    /** Return a Matcher which iterates over the set of all deleted doc nums
     * for this segment.
     */
    abstract incremented Matcher*
    Iterator(DeletionsReader *self);

    public incremented nullable DeletionsReader*
    Aggregator(DeletionsReader *self, Vector *readers, I32Array *offsets);
}

class Lucy::Index::PolyDeletionsReader nickname PolyDelReader
    inherits Lucy::Index::DeletionsReader {

    Vector   *readers;
    I32Array *offsets;
    int32_t   del_count;

    inert incremented PolyDeletionsReader*
    new(Vector *readers, I32Array *offsets);

    inert PolyDeletionsReader*
    init(PolyDeletionsReader *self, Vector *readers, I32Array *offsets);

    int32_t
    Del_Count(PolyDeletionsReader *self);

    incremented Matcher*
    Iterator(PolyDeletionsReader *self);

    void
    Close(PolyDeletionsReader *self);

    public void
    Destroy(PolyDeletionsReader *self);
}

class Lucy::Index::DefaultDeletionsReader nickname DefDelReader
    inherits Lucy::Index::DeletionsReader {

    BitVector *deldocs;
    int32_t    del_count;

    inert incremented DefaultDeletionsReader*
    new(Schema *schema, Folder *folder, Snapshot *snapshot, Vector *segments,
        int32_t seg_tick);

    inert DefaultDeletionsReader*
    init(DefaultDeletionsReader *self, Schema *schema, Folder *folder,
         Snapshot *snapshot, Vector *segments, int32_t seg_tick);

    int32_t
    Del_Count(DefaultDeletionsReader *self);

    incremented Matcher*
    Iterator(DefaultDeletionsReader *self);

    nullable BitVector*
    Read_Deletions(DefaultDeletionsReader *self);

    void
    Close(DefaultDeletionsReader *self);

    public void
    Destroy(DefaultDeletionsReader *self);
}