/* 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;

/** Writer for sortable fields.
 *
 * Changes for format version 3:
 *
 *   * Big-endian byte order instead of native byte order for ".ord" files.
 *   * "ord_widths" key added to metadata.
 *   * In variable-width cache formats, NULL entries get a file pointer in the
 *     ".ix" file instead of -1.
 */

class Lucy::Index::SortWriter inherits Lucy::Index::DataWriter {

    VArray     *field_writers;
    Hash       *counts;
    Hash       *null_ords;
    Hash       *ord_widths;
    OutStream  *temp_ord_out;
    OutStream  *temp_ix_out;
    OutStream  *temp_dat_out;
    Counter    *counter;
    size_t      mem_thresh;
    bool        flush_at_finish;

    inert int32_t current_file_format;

    inert incremented SortWriter*
    new(Schema *schema, Snapshot *snapshot, Segment *segment,
        PolyReader *polyreader);

    inert SortWriter*
    init(SortWriter *self, Schema *schema, Snapshot *snapshot,
         Segment *segment, PolyReader *polyreader);

    /* Test only. */
    inert void
    set_default_mem_thresh(size_t mem_thresh);

    public void
    Add_Inverted_Doc(SortWriter *self, Inverter *inverter, int32_t doc_id);

    public void
    Add_Segment(SortWriter *self, SegReader *reader,
                I32Array *doc_map = NULL);

    public incremented Hash*
    Metadata(SortWriter *self);

    public int32_t
    Format(SortWriter *self);

    public void
    Finish(SortWriter *self);

    public void
    Destroy(SortWriter *self);
}

final class Lucy::Index::Counter inherits Clownfish::Obj {
    int64_t value;

    inert incremented Counter*
    new();

    inert Counter*
    init(Counter *self);

    int64_t
    Add(Counter *self, int64_t amount);

    int64_t
    Get_Value(Counter *self);

    void
    Reset(Counter *self);
}