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00025 #ifndef XAPIAN_INCLUDED_QUERY_H
00026 #define XAPIAN_INCLUDED_QUERY_H
00027
00028 #include <string>
00029 #include <vector>
00030
00031 #include <xapian/base.h>
00032 #include <xapian/deprecated.h>
00033 #include <xapian/types.h>
00034 #include <xapian/termiterator.h>
00035 #include <xapian/visibility.h>
00036
00037
00038
00039
00040 class LocalSubMatch;
00041 class MultiMatch;
00042 class QueryOptimiser;
00043 struct SortPosName;
00044
00045 namespace Xapian {
00046
00051 class XAPIAN_VISIBILITY_DEFAULT Query {
00052 public:
00054 class Internal;
00056 Xapian::Internal::RefCntPtr<Internal> internal;
00057
00059 typedef enum {
00061 OP_AND,
00062
00064 OP_OR,
00065
00067 OP_AND_NOT,
00068
00070 OP_XOR,
00071
00073 OP_AND_MAYBE,
00074
00076 OP_FILTER,
00077
00086 OP_NEAR,
00087
00096 OP_PHRASE,
00097
00099 OP_VALUE_RANGE,
00100
00109 OP_SCALE_WEIGHT,
00110
00114 OP_ELITE_SET,
00115
00117 OP_VALUE_GE,
00118
00120 OP_VALUE_LE
00121 } op;
00122
00124 Query(const Query & copyme);
00125
00127 Query & operator=(const Query & copyme);
00128
00137 Query();
00138
00140 ~Query();
00141
00143 Query(const std::string & tname_, Xapian::termcount wqf_ = 1,
00144 Xapian::termpos pos_ = 0);
00145
00147 Query(Query::op op_, const Query & left, const Query & right);
00148
00150 Query(Query::op op_,
00151 const std::string & left, const std::string & right);
00152
00168 template <class Iterator>
00169 Query(Query::op op_, Iterator qbegin, Iterator qend,
00170 Xapian::termcount parameter = 0);
00171
00178 XAPIAN_DEPRECATED(Query(Query::op op_, Xapian::Query q));
00179
00183 Query(Query::op op_, Xapian::Query q, double parameter);
00184
00198 Query(Query::op op_, Xapian::valueno valno,
00199 const std::string &begin, const std::string &end);
00200
00212 Query(Query::op op_, Xapian::valueno valno, const std::string &value);
00213
00215 static Xapian::Query MatchAll;
00216
00218 static Xapian::Query MatchNothing;
00219
00224 Xapian::termcount get_length() const;
00225
00231 TermIterator get_terms_begin() const;
00232
00236 TermIterator get_terms_end() const {
00237 return TermIterator(NULL);
00238 }
00239
00243 bool empty() const;
00244
00246 std::string get_description() const;
00247
00248 private:
00249 void add_subquery(const Query & subq);
00250 void add_subquery(const Query * subq);
00251 void add_subquery(const std::string & tname);
00252 void start_construction(Query::op op_, Xapian::termcount parameter);
00253 void end_construction();
00254 void abort_construction();
00255 };
00256
00257 template <class Iterator>
00258 Query::Query(Query::op op_, Iterator qbegin, Iterator qend, termcount parameter)
00259 : internal(0)
00260 {
00261 try {
00262 start_construction(op_, parameter);
00263
00264
00265 while (qbegin != qend) {
00266 add_subquery(*qbegin);
00267 ++qbegin;
00268 }
00269
00270 end_construction();
00271 } catch (...) {
00272 abort_construction();
00273 throw;
00274 }
00275 }
00276
00278 class XAPIAN_VISIBILITY_DEFAULT Query::Internal : public Xapian::Internal::RefCntBase {
00279 friend class ::LocalSubMatch;
00280 friend class ::MultiMatch;
00281 friend class ::QueryOptimiser;
00282 friend struct ::SortPosName;
00283 friend class Query;
00284 public:
00285 static const int OP_LEAF = -1;
00286
00288 typedef std::vector<Internal *> subquery_list;
00289
00291 typedef int op_t;
00292
00293 private:
00295 Xapian::Query::Internal::op_t op;
00296
00298 subquery_list subqs;
00299
00307 Xapian::termcount parameter;
00308
00315 std::string tname;
00316
00318 std::string str_parameter;
00319
00321 Xapian::termpos term_pos;
00322
00324 Xapian::termcount wqf;
00325
00333 void swap(Query::Internal &other);
00334
00336 void initialise_from_copy(const Query::Internal & copyme);
00337
00338 void accumulate_terms(
00339 std::vector<std::pair<std::string, Xapian::termpos> > &terms) const;
00340
00345 Internal * simplify_query();
00346
00352 void validate_query() const;
00353
00359 bool simplify_matchnothing();
00360
00363 static std::string get_op_name(Xapian::Query::Internal::op_t op);
00364
00367 void collapse_subqs();
00368
00372 void flatten_subqs();
00373
00376 std::string serialise(Xapian::termpos & curpos) const;
00377
00378 public:
00380 Internal(const Query::Internal & copyme);
00381
00383 void operator=(const Query::Internal & copyme);
00384
00386 explicit Internal(const std::string & tname_, Xapian::termcount wqf_ = 1,
00387 Xapian::termpos term_pos_ = 0);
00388
00390 Internal(op_t op_, Xapian::termcount parameter);
00391
00393 Internal(op_t op_, Xapian::valueno valno,
00394 const std::string &begin, const std::string &end);
00395
00398 Internal(op_t op_, Xapian::valueno valno, const std::string &value);
00399
00401 ~Internal();
00402
00403 static Xapian::Query::Internal * unserialise(const std::string &s);
00404
00407 void add_subquery(const Query::Internal * subq);
00408
00409 void set_dbl_parameter(double dbl_parameter_);
00410
00411 double get_dbl_parameter() const;
00412
00415 Query::Internal * end_construction();
00416
00420 std::string serialise() const {
00421 Xapian::termpos curpos = 1;
00422 return serialise(curpos);
00423 }
00424
00426 std::string get_description() const;
00427
00435 Xapian::termcount get_parameter() const { return parameter; }
00436
00441 Xapian::termcount get_length() const;
00442
00448 TermIterator get_terms() const;
00449 };
00450
00451 }
00452
00453 #endif