/**************************************************************************
 *
 * invf_get.h -- Inverted file reading routines
 * Copyright (C) 1994  Neil Sharman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 *
 **************************************************************************/


#ifndef H_INVF_GET
#define H_INVF_GET

typedef struct Invf_Doc_Entry
  {
    int DocNum;
    float Sum;
  }
Invf_Doc_Entry;

typedef struct Invf_Doc_Entry_Pool
  {
    void *pool;
    unsigned pool_chunks;
  }
Invf_Doc_Entry_Pool;

typedef struct Invf_Doc_EntryH
  {
    Invf_Doc_Entry IDE;
    struct Invf_Doc_EntryH *next;
  }
Invf_Doc_EntryH;

typedef struct Hash_Table
  {
    Invf_Doc_EntryH *Suplimentary_Entries;
    int Suplimentary_Size;
    int Suplimentary_Num;
    unsigned max;
    unsigned num;
    unsigned size;
    Invf_Doc_EntryH **HashTable;
    Invf_Doc_EntryH *Head;
    Invf_Doc_EntryH IDEH[1];
  }
Hash_Table;

typedef struct List_Table
  {
    unsigned max;
    unsigned num;
    Invf_Doc_Entry IDE[1];
  }
List_Table;

typedef enum
  {
    op_term, op_and_terms, op_and_or_terms, op_diff_terms
  }
Op_types;

/*Invf_Doc_Entry *HT_find(Hash_Table *HT, mg_u_long DN); */
void HT_free (query_data * qd, Hash_Table * HT);
void LT_free (query_data * qd, List_Table * LT);

invf_data *InitInvfFile (File * InvfFile, stemmed_dict * sd);
void FreeInvfData (invf_data * id);

DocList *GetDocs (query_data * qd, WordEntry * we, BooleanQueryInfo * bqi);

float *CosineDecode (query_data * qd, TermList * Terms, RankedQueryInfo * rqi);

void free_ide_pool (query_data * qd, Invf_Doc_Entry_Pool * pool);

Splay_Tree *CosineDecodeSplay (query_data * qd, TermList * Terms,
			 RankedQueryInfo * rqi, Invf_Doc_Entry_Pool * pool);

Hash_Table *CosineDecodeHash (query_data * qd, TermList * Terms,
			      RankedQueryInfo * rqi);
List_Table *CosineDecodeList (query_data * qd, TermList * Terms,
			      RankedQueryInfo * rqi);


DocList *GetDocsOp (query_data * qd, WordEntry * we, Op_types op, DocList * L);



#endif