/* 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;

/** Read a segment's highlighting data.
 *
 * Read segment data used for creating highlighted excerpts.
 */
class Lucy::Index::HighlightReader cnick HLReader
    inherits Lucy::Index::DataReader {

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

    /** Return the DocVector object for the given doc id.
     */
    public abstract incremented DocVector*
    Fetch_Doc_Vec(HighlightReader *self, int32_t doc_id);

    public incremented nullable HighlightReader*
    Aggregator(HighlightReader *self, VArray *readers, I32Array *offsets);
}

class Lucy::Index::PolyHighlightReader cnick PolyHLReader
    inherits Lucy::Index::HighlightReader {

    VArray   *readers;
    I32Array *offsets;

    inert incremented PolyHighlightReader*
    new(VArray *readers, I32Array *offsets);

    inert PolyHighlightReader*
    init(PolyHighlightReader *self, VArray *readers, I32Array *offsets);

    public incremented DocVector*
    Fetch_Doc_Vec(PolyHighlightReader *self, int32_t doc_id);

    public void
    Close(PolyHighlightReader *self);

    public void
    Destroy(PolyHighlightReader *self);
}

class Lucy::Index::DefaultHighlightReader cnick DefHLReader
    inherits Lucy::Index::HighlightReader {

    InStream *ix_in;
    InStream *dat_in;

    /** Constructors.
     */
    inert incremented DefaultHighlightReader*
    new(Schema *schema, Folder *folder, Snapshot *snapshot, VArray *segments,
        int32_t seg_tick);

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

    /** Return the DocVector object for the given doc id.
     */
    public incremented DocVector*
    Fetch_Doc_Vec(DefaultHighlightReader *self, int32_t doc_id);

    /** Return the raw bytes of an entry.
     */
    void
    Read_Record(DefaultHighlightReader *self, int32_t doc_id,
                ByteBuf *buffer);

    public void
    Close(DefaultHighlightReader *self);

    public void
    Destroy(DefaultHighlightReader *self);
}