/* 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;

/** A document.
 *
 * A Doc object is akin to a row in a database, in that it is made up of one
 * or more fields, each of which has a value.
 */

public class Lucy::Document::Doc inherits Lucy::Object::Obj
    : dumpable {

    void        *fields;
    int32_t      doc_id;

    inert incremented Doc*
    new(void *fields = NULL, int32_t doc_id = 0);

    /**
     * @param fields Field-value pairs.
     * @param doc_id Internal Lucy document id.  Default of 0 (an
     * invalid doc id).
     */
    public inert Doc*
    init(Doc *self, void *fields = NULL, int32_t doc_id = 0);

    /** Set internal Lucy document id.
     */
    public void
    Set_Doc_ID(Doc *self, int32_t doc_id);

    /** Retrieve internal Lucy document id.
     */
    public int32_t
    Get_Doc_ID(Doc *self);

    /** Store a field value in the Doc.
     */
    void
    Store(Doc *self, const CharBuf *field, Obj *value);

    /** Set the doc's field's attribute.
     */
    void
    Set_Fields(Doc *self, void *fields);

    /** Return the Doc's backing fields hash.
     */
    public nullable void*
    Get_Fields(Doc *self);

    /** Return the number of fields in the Doc.
     */
    public uint32_t
    Get_Size(Doc *self);

    /** Retrieve the field's value, or NULL if the field is not present.  If
     * the field is a text type, assign it to <code>target</code>.  Otherwise,
     * return the interior object.  Callers must check to verify the kind of
     * object returned.
     */
    nullable Obj*
    Extract(Doc *self, CharBuf *field, ViewCharBuf *target);

    /* Unimplemented methods.
     */
    public bool_t
    Equals(Doc *self, Obj *other);

    public void
    Serialize(Doc *self, OutStream *outstream);

    public incremented Doc*
    Deserialize(Doc *self, InStream *instream);

    public incremented Hash*
    Dump(Doc *self);

    public incremented Doc*
    Load(Doc *self, Obj *dump);

    void*
    To_Host(Doc *self);

    public void
    Destroy(Doc *self);
}