Branch data Line data Source code
1 : : /** @file weight.cc
2 : : * @brief Xapian::Weight base class
3 : : */
4 : : /* Copyright (C) 2007,2008,2009 Olly Betts
5 : : * Copyright (C) 2009 Lemur Consulting Ltd
6 : : *
7 : : * This program is free software; you can redistribute it and/or
8 : : * modify it under the terms of the GNU General Public License as
9 : : * published by the Free Software Foundation; either version 2 of the
10 : : * License, or (at your option) any later version.
11 : : *
12 : : * This program is distributed in the hope that it will be useful
13 : : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : : * GNU General Public License for more details.
16 : : *
17 : : * You should have received a copy of the GNU General Public License
18 : : * along with this program; if not, write to the Free Software
19 : : * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 : : */
21 : :
22 : : #include <config.h>
23 : :
24 : : #include "xapian/weight.h"
25 : :
26 : : #include "weightinternal.h"
27 : :
28 : : #include "debuglog.h"
29 : :
30 : : #include "xapian/error.h"
31 : :
32 : : using namespace std;
33 : :
34 : : namespace Xapian {
35 : :
36 : : void
37 : 246352 : Weight::init_(const Internal & stats, Xapian::termcount query_length)
38 : : {
39 : : LOGCALL_VOID(MATCH, "Weight::init_", stats | query_length);
40 : 246352 : collection_size_ = stats.collection_size;
41 : 246352 : rset_size_ = stats.rset_size;
42 [ + + ]: 246352 : if (stats_needed & AVERAGE_LENGTH)
43 : 245536 : average_length_ = stats.get_average_length();
44 [ - + ]: 246352 : if (stats_needed & DOC_LENGTH_MAX)
45 : 0 : doclength_upper_bound_ = stats.db.get_doclength_upper_bound();
46 [ + + ]: 246352 : if (stats_needed & DOC_LENGTH_MIN)
47 : 245568 : doclength_lower_bound_ = stats.db.get_doclength_lower_bound();
48 : 246352 : wdf_upper_bound_ = 0;
49 : 246352 : termfreq_ = 0;
50 : 246352 : reltermfreq_ = 0;
51 : 246352 : query_length_ = query_length;
52 : 246352 : wqf_ = 1;
53 : 246352 : }
54 : :
55 : : void
56 : 473840 : Weight::init_(const Internal & stats, Xapian::termcount query_length,
57 : : const string & term, Xapian::termcount wqf, double factor)
58 : : {
59 : : LOGCALL_VOID(MATCH, "Weight::init_", stats | query_length | term | wqf | factor);
60 : 473840 : collection_size_ = stats.collection_size;
61 : 473840 : rset_size_ = stats.rset_size;
62 [ + + ]: 473840 : if (stats_needed & AVERAGE_LENGTH)
63 : 471900 : average_length_ = stats.get_average_length();
64 [ - + ]: 473840 : if (stats_needed & DOC_LENGTH_MAX)
65 : 0 : doclength_upper_bound_ = stats.db.get_doclength_upper_bound();
66 [ + + ]: 473840 : if (stats_needed & DOC_LENGTH_MIN)
67 : 471932 : doclength_lower_bound_ = stats.db.get_doclength_lower_bound();
68 [ + + ]: 473840 : if (stats_needed & WDF_MAX)
69 : 471948 : wdf_upper_bound_ = stats.db.get_wdf_upper_bound(term);
70 [ + + ]: 473840 : if (stats_needed & TERMFREQ)
71 : 471948 : termfreq_ = stats.get_termfreq(term);
72 [ + + ]: 473840 : if (stats_needed & RELTERMFREQ)
73 : 471948 : reltermfreq_ = stats.get_reltermfreq(term);
74 : 473840 : query_length_ = query_length;
75 : 473840 : wqf_ = wqf;
76 : 473840 : init(factor);
77 : 473840 : }
78 : :
79 : : void
80 : 592 : Weight::init_(const Internal & stats, Xapian::termcount query_length,
81 : : double factor, Xapian::doccount termfreq,
82 : : Xapian::doccount reltermfreq)
83 : : {
84 : : LOGCALL_VOID(MATCH, "Weight::init_", stats | query_length | factor | termfreq | reltermfreq);
85 : : // Synonym case.
86 : 592 : collection_size_ = stats.collection_size;
87 : 592 : rset_size_ = stats.rset_size;
88 [ + - ]: 592 : if (stats_needed & AVERAGE_LENGTH)
89 : 592 : average_length_ = stats.get_average_length();
90 [ - + ]: 592 : if (stats_needed & DOC_LENGTH_MAX)
91 : 0 : doclength_upper_bound_ = stats.db.get_doclength_upper_bound();
92 [ + - ]: 592 : if (stats_needed & DOC_LENGTH_MIN)
93 : 592 : doclength_lower_bound_ = stats.db.get_doclength_lower_bound();
94 : :
95 : : // The doclength is an upper bound on the wdf. This is obviously true for
96 : : // normal terms, but SynonymPostList ensures that it is also true for
97 : : // synonym terms by clamping the wdf values returned to the doclength.
98 : : //
99 : : // (This clamping is only actually necessary in cases where a constituent
100 : : // term of the synonym is repeated.)
101 [ + - ]: 592 : if (stats_needed & WDF_MAX)
102 : 592 : wdf_upper_bound_ = stats.db.get_doclength_upper_bound();
103 : :
104 : 592 : termfreq_ = termfreq;
105 : 592 : reltermfreq_ = reltermfreq;
106 : 592 : query_length_ = query_length;
107 : 592 : wqf_ = 1;
108 : 592 : init(factor);
109 : 592 : }
110 : :
111 [ # # ][ # # ]: 735837 : Weight::~Weight() { }
[ - + ]
112 : :
113 : : string
114 : 0 : Weight::name() const
115 : : {
116 : 0 : return string();
117 : : }
118 : :
119 : : string
120 : 0 : Weight::serialise() const
121 : : {
122 : 0 : throw Xapian::UnimplementedError("serialise() not supported for this Xapian::Weight subclass");
123 : : }
124 : :
125 : : Weight *
126 : 0 : Weight::unserialise(const string &) const
127 : : {
128 : 0 : throw Xapian::UnimplementedError("unserialise() not supported for this Xapian::Weight subclass");
129 : : }
130 : :
131 : : }
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