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101 lines
3 KiB
C
101 lines
3 KiB
C
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/** @file
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* @brief MatchDecider subclass for filtering results by value.
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*/
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/* Copyright 2008 Lemur Consulting Ltd
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* Copyright 2008,2009,2011,2013,2014 Olly Betts
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#ifndef XAPIAN_INCLUDED_VALUESETMATCHDECIDER_H
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#define XAPIAN_INCLUDED_VALUESETMATCHDECIDER_H
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#if !defined XAPIAN_IN_XAPIAN_H && !defined XAPIAN_LIB_BUILD
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# error Never use <xapian/valuesetmatchdecider.h> directly; include <xapian.h> instead.
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#endif
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#include <xapian/enquire.h>
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#include <xapian/types.h>
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#include <xapian/visibility.h>
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#include <string>
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#include <set>
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namespace Xapian {
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class Document;
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/** MatchDecider filtering results based on whether document values are in a
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* user-defined set.
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*/
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class XAPIAN_VISIBILITY_DEFAULT ValueSetMatchDecider : public MatchDecider {
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/** Set of values to test for. */
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std::set<std::string> testset;
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/** The value slot to look in. */
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valueno valuenum;
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/** Whether to include or exclude documents with the specified values.
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*
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* If true, documents with a value in the set are returned.
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* If false, documents with a value not in the set are returned.
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*/
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bool inclusive;
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public:
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/** Construct a ValueSetMatchDecider.
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*
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* @param slot The value slot number to look in.
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*
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* @param inclusive_ If true, match decider accepts documents which have a
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* value in the specified slot which is a member of the test set; if
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* false, match decider accepts documents which do not have a value in the
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* specified slot.
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*/
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ValueSetMatchDecider(Xapian::valueno slot, bool inclusive_)
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: valuenum(slot), inclusive(inclusive_) { }
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/** Add a value to the test set.
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*
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* @param value The value to add to the test set.
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*/
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void add_value(const std::string& value)
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{
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testset.insert(value);
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}
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/** Remove a value from the test set.
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*
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* @param value The value to remove from the test set.
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*/
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void remove_value(const std::string& value)
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{
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testset.erase(value);
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}
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/** Decide whether we want a particular document to be in the MSet.
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*
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* @param doc The document to test.
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* @return true if the document is acceptable, or false if the
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* document should be excluded from the MSet.
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*/
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bool operator()(const Xapian::Document& doc) const;
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};
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}
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#endif /* XAPIAN_INCLUDED_VALUESETMATCHDECIDER_H */
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