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function sel = helperFindDb(X, stringFields, numericFields, varargin)
% HELPERFINDDB Helper functions to find stuff in DBs
%
% See also:: GETKERNELNAMES(), FINDROIS().
% Author:: Andrea Vedaldi
% AUTORIGHTS
% Copyright (C) 2008-09 Andrea Vedaldi
%
% This file is part of the VGG MKL Class and VGG MKL Det code packages,
% available in the terms of the GNU General Public License version 2.
useRegex = 0 ;
sel = 1:length(X) ;
i = 1 ;
while i <= length(varargin)
field = varargin{i} ;
neg = 0 ;
if ~ischar(field)
error('String expected.') ;
end
% turn regex on
if strcmp('regexp', field)
useRegex = 1 ;
i = i + 1 ;
continue ;
end
% turn regex off
if strcmp('noregexp', field)
useRegex = 0 ;
i = i + 1 ;
continue ;
end
% get value
value = varargin{i+1} ;
% handle value = '*'
if ischar(value) & strcmp('*', value)
i = i + 2 ;
continue ;
end
% handle field begins with '~'
if field(1) == '~'
neg = 1 ;
field = field(2:end) ;
end
switch field
case 'subset'
if ~ neg
sel = intersect(sel, value) ;
else
sel = setdiff(sel, value) ;
end
case numericFields
match = cellfun(@(x) isequalwithequalnans(x, value), {X(sel).(field)}) ;
if neg, match = ~ match ; end
sel = sel(match) ;
case stringFields
if ~ useRegex
match = strcmp(value, {X(sel).(field)}) ;
else
match = cellfun(@(x)~isempty(x), regexp({X(sel).(field)}, value)) ;
end
if neg, match = ~ match ; end
sel = sel(match) ;
otherwise
warning(sprintf('''%s'' is not a recognized field. Skipping.', field)) ;
end
i = i + 2 ;
end
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