src/rpn2solr.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2011 Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file
   7  * \brief Implements RPN to SOLR conversion
   8  */
   9 #if HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <assert.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <yaz/rpn2solr.h>
  17 #include <yaz/xmalloc.h>
  18 #include <yaz/diagbib1.h>
  19 #include <yaz/z-core.h>
  20 #include <yaz/wrbuf.h>
  21
  22 static void wrbuf_vputs(const char *buf, void *client_data)
  23 {
  24     wrbuf_write((WRBUF) client_data, buf, strlen(buf));
  25 }
  26
  27 static const char *lookup_index_from_string_attr(Z_AttributeList *attributes)
  28 {
  29     int j;
  30     int server_choice = 1;
  31     for (j = 0; j < attributes->num_attributes; j++)
  32     {
  33         Z_AttributeElement *ae = attributes->attributes[j];
  34         if (*ae->attributeType == 1) /* use attribute */
  35         {
  36             if (ae->which == Z_AttributeValue_complex)
  37             {
  38                 Z_ComplexAttribute *ca = ae->value.complex;
  39                 int i;
  40                 for (i = 0; i < ca->num_list; i++)
  41                 {
  42                     Z_StringOrNumeric *son = ca->list[i];
  43                     if (son->which == Z_StringOrNumeric_string)
  44                         return son->u.string;
  45                 }
  46             }
  47             server_choice = 0; /* not serverChoice because we have use attr */
  48         }
  49     }
  50     if (server_choice)
  51         return "solr.serverChoice";
  52     return 0;
  53 }
  54
  55 static const char *lookup_relation_index_from_attr(Z_AttributeList *attributes)
  56 {
  57     int j;
  58     for (j = 0; j < attributes->num_attributes; j++)
  59     {
  60         Z_AttributeElement *ae = attributes->attributes[j];
  61         if (*ae->attributeType == 2) /* relation attribute */
  62         {
  63             if (ae->which == Z_AttributeValue_numeric)
  64             {
  65                 /* Only support for numeric relation */
  66                 Odr_int *relation = ae->value.numeric;
  67                 /* map this numeric to representation in SOLR */
  68                 switch (*relation)
  69                 {
  70                     /* Unsure on whether this is the relation attribute constants? */
  71                 case Z_ProximityOperator_Prox_lessThan:
  72                     return 0;
  73                 case Z_ProximityOperator_Prox_lessThanOrEqual:
  74                     return 0;
  75                 case Z_ProximityOperator_Prox_equal:
  76                     return ":";
  77                 case Z_ProximityOperator_Prox_greaterThanOrEqual:
  78                     return 0;
  79                 case Z_ProximityOperator_Prox_greaterThan:
  80                     return 0;
  81                 case Z_ProximityOperator_Prox_notEqual:
  82                     return 0;
  83                 case 100:
  84                     /* phonetic is not implemented*/
  85                     return 0;
  86                 case 101:
  87                     /* stem is not not implemented */
  88                     return 0;
  89                 case 102:
  90                     /* relevance is supported in SOLR, but not implemented yet */
  91                     return 0;
  92                 default:
  93                     /* Invalid relation */
  94                     return 0;
  95                 }
  96             }
  97             else {
  98                 /*  Can we have a complex relation value?
  99                     Should we implement something?
 100                 */
 101             }
 102         }
 103     }
 104     return ":";
 105 }
 106
 107 static int rpn2solr_attr(solr_transform_t ct,
 108                         Z_AttributeList *attributes, WRBUF w)
 109 {
 110     const char *relation = solr_lookup_reverse(ct, "relation.", attributes);
 111     const char *index = solr_lookup_reverse(ct, "index.", attributes);
 112     const char *structure = solr_lookup_reverse(ct, "structure.", attributes);
 113
 114     /* if transform (properties) do not match, we'll just use a USE string attribute (bug #2978) */
 115     if (!index)
 116         index = lookup_index_from_string_attr(attributes);
 117
 118     /* Attempt to fix bug #2978: Look for a relation attribute */
 119     if (!relation)
 120         relation = lookup_relation_index_from_attr(attributes);
 121
 122     if (!index)
 123     {
 124         solr_transform_set_error(ct,
 125                                 YAZ_BIB1_UNSUPP_USE_ATTRIBUTE, 0);
 126         return -1;
 127     }
 128     /* for serverChoice we omit index+relation+structure */
 129     if (strcmp(index, "solr.serverChoice"))
 130     {
 131         wrbuf_puts(w, index);
 132         if (relation)
 133         {
 134             if (!strcmp(relation, "exact"))
 135                 /* TODO Verify if a exact  SOLR exists */
 136                 relation = ":";
 137             else if (!strcmp(relation, "eq"))
 138                 relation = ":";
 139             else if (!strcmp(relation, "le")) {
 140                 /* TODO Not support as such, but could perhaps be transformed into a range
 141                 relation = ":[ * to ";
 142                 close_range = "]"
 143                 */
 144             }
 145             else if (!strcmp(relation, "ge")) {
 146                 /* TODO Not support as such, but could perhaps be transformed into a range
 147                 relation = "[";
 148                 relation = ":[ * to ";
 149                 close_range = "]"
 150                 */
 151             }
 152             /* Missing mapping of not equal, phonetic, stem and relevance */
 153             wrbuf_puts(w, relation);
 154         }
 155         else
 156             wrbuf_puts(w, ":");
 157
 158         if (structure)
 159         {
 160             if (strcmp(structure, "*"))
 161             {
 162                 wrbuf_puts(w, "/");
 163                 wrbuf_puts(w, structure);
 164                 wrbuf_puts(w, " ");
 165             }
 166         }
 167     }
 168     return 0;
 169 }
 170
 171 /* Bug 2878: Currently only support left and right truncation. Specific check for this */
 172 static int checkForTruncation(int flag, Z_AttributeList *attributes)
 173 {
 174     int j;
 175     for (j = 0; j < attributes->num_attributes; j++)
 176     {
 177         Z_AttributeElement *ae = attributes->attributes[j];
 178         if (*ae->attributeType == 5) /* truncation attribute */
 179         {
 180             if (ae->which == Z_AttributeValue_numeric)
 181             {
 182                 Odr_int truncation = *(ae->value.numeric);
 183                 /* This logic only works for Left, right and both. eg. 1,2,3 */
 184                 if (truncation <= 3)
 185                     return ((int) truncation & flag);
 186             }
 187             /* Complex: Shouldn't happen */
 188         }
 189     }
 190     /* No truncation or unsupported */
 191     return 0;
 192 };
 193
 194 static int checkForLeftTruncation(Z_AttributeList *attributes) {
 195         return checkForTruncation(1, attributes);
 196 }
 197
 198 static int checkForRightTruncation(Z_AttributeList *attributes) {
 199         return checkForTruncation(2, attributes);
 200 };
 201
 202 static int rpn2solr_simple(solr_transform_t ct,
 203                           void (*pr)(const char *buf, void *client_data),
 204                           void *client_data,
 205                           Z_Operand *q, WRBUF w)
 206 {
 207     int ret = 0;
 208     if (q->which != Z_Operand_APT)
 209     {
 210         ret = -1;
 211         solr_transform_set_error(ct, YAZ_BIB1_RESULT_SET_UNSUPP_AS_A_SEARCH_TERM, 0);
 212     }
 213     else
 214     {
 215         Z_AttributesPlusTerm *apt = q->u.attributesPlusTerm;
 216         Z_Term *term = apt->term;
 217         const char *sterm = 0;
 218         size_t lterm = 0;
 219
 220         wrbuf_rewind(w);
 221         ret = rpn2solr_attr(ct, apt->attributes, w);
 222
 223         switch(term->which)
 224         {
 225         case Z_Term_general:
 226             lterm = term->u.general->len;
 227             sterm = (const char *) term->u.general->buf;
 228             break;
 229         case Z_Term_numeric:
 230             wrbuf_printf(w, ODR_INT_PRINTF, *term->u.numeric);
 231             break;
 232         case Z_Term_characterString:
 233             sterm = term->u.characterString;
 234             lterm = strlen(sterm);
 235             break;
 236         default:
 237             ret = -1;
 238             solr_transform_set_error(ct, YAZ_BIB1_TERM_TYPE_UNSUPP, 0);
 239         }
 240
 241         if (term)
 242         {
 243             size_t i;
 244             int must_quote = 0;
 245             for (i = 0 ; i < lterm; i++)
 246                 if (sterm[i] == ' ')
 247                     must_quote = 1;
 248             if (must_quote)
 249                 wrbuf_puts(w, "\"");
 250             /* Bug 2878: Check and add Truncation */
 251                         if (checkForLeftTruncation(apt->attributes))
 252                 wrbuf_puts(w, "*");
 253             wrbuf_write(w, sterm, lterm);
 254             /* Bug 2878: Check and add Truncation */
 255                         if (checkForRightTruncation(apt->attributes))
 256                 wrbuf_puts(w, "*");
 257             if (must_quote)
 258                 wrbuf_puts(w, "\"");
 259         }
 260         if (ret == 0)
 261             pr(wrbuf_cstr(w), client_data);
 262     }
 263     return ret;
 264 }
 265
 266
 267 static int rpn2solr_structure(solr_transform_t ct,
 268                              void (*pr)(const char *buf, void *client_data),
 269                              void *client_data,
 270                              Z_RPNStructure *q, int nested,
 271                              WRBUF w)
 272 {
 273     if (q->which == Z_RPNStructure_simple)
 274         return rpn2solr_simple(ct, pr, client_data, q->u.simple, w);
 275     else
 276     {
 277         Z_Operator *op = q->u.complex->roperator;
 278         int r;
 279
 280         if (nested)
 281             pr("(", client_data);
 282
 283         r = rpn2solr_structure(ct, pr, client_data, q->u.complex->s1, 1, w);
 284         if (r)
 285             return r;
 286         switch(op->which)
 287         {
 288         case  Z_Operator_and:
 289             pr(" AND ", client_data);
 290             break;
 291         case  Z_Operator_or:
 292             pr(" OR ", client_data);
 293             break;
 294         case  Z_Operator_and_not:
 295             pr(" AND NOT ", client_data);
 296             break;
 297         case  Z_Operator_prox:
 298             solr_transform_set_error(ct, YAZ_BIB1_UNSUPP_SEARCH, 0);
 299             return -1;
 300         }
 301         r = rpn2solr_structure(ct, pr, client_data, q->u.complex->s2, 1, w);
 302         if (nested)
 303             pr(")", client_data);
 304         return r;
 305     }
 306 }
 307
 308 int solr_transform_rpn2solr_stream(solr_transform_t ct,
 309                                  void (*pr)(const char *buf, void *client_data),
 310                                  void *client_data,
 311                                  Z_RPNQuery *q)
 312 {
 313     int r;
 314     WRBUF w = wrbuf_alloc();
 315     solr_transform_set_error(ct, 0, 0);
 316     r = rpn2solr_structure(ct, pr, client_data, q->RPNStructure, 0, w);
 317     wrbuf_destroy(w);
 318     return r;
 319 }
 320
 321
 322 int solr_transform_rpn2solr_wrbuf(solr_transform_t ct,
 323                                 WRBUF w,
 324                                 Z_RPNQuery *q)
 325 {
 326     return solr_transform_rpn2solr_stream(ct, wrbuf_vputs, w, q);
 327 }
 328
 329 /*
 330  * Local variables:
 331  * c-basic-offset: 4
 332  * c-file-style: "Stroustrup"
 333  * indent-tabs-mode: nil
 334  * End:
 335  * vim: shiftwidth=4 tabstop=8 expandtab
 336  */
 337