Mercurial > hg > ltpda

annotate m-toolbox/classes/@ltpda_uo/retrieve.m @ 51:9d5c88356247 database-connection-manager

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Make unit tests database connection parameters configurable
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 07 Dec 2011 17:24:37 +0100
parents 0bcdf74587d1
children
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1 % RETRIEVE retrieves a collection of objects from an LTPDA repository.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: This static method retrieves a collection of objects from an
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5 % LTPDA repository.
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6 %
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7 % CALL: objs = retrieve(conn, obj_id_1, obj_id_2)
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8 % [o1,o2] = retrieve(conn, obj_id_1, obj_id_2)
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9 % [o1,o2] = retrieve(conn, 'binary', obj_id_1, obj_id_2)
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10 % objs = retrieve(conn, 'Collection', coll_id)
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11 % objs = retrieve(conn, 'binary', 'Collection', coll_id)
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12 %
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13 % INPUTS:
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14 % conn - database connection object
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15 % obj_id_N - an object ID
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16 % coll_id - a collection ID
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17 % 'binary' - to retrieve a binary representation of the object
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18 % (if stored)
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19 %
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20 % OUTPUTS:
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21 % objs - the retrieved object(s) as a cell array.*
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22 % o1,o2,...,oN - returns the first N objects
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23 %
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24 %
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25 % If more than one object is retrieved and only one output is specified
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26 % then the output is a cell array of objects.
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27 %
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28 % If only a single object is requested, it is returned as an object,
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29 % not packed in a cell array.
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30 %
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31 % VERSION: $Id: retrieve.m,v 1.29 2011/11/30 06:49:01 hewitson Exp $
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32 %
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33 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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34
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35 function varargout = retrieve(conn, varargin)
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36
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37 import utils.const.*
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38 utils.helper.msg(msg.MNAME, 'running %s/%s', mfilename('class'), mfilename);
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39
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40 if numel(varargin) < 2
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41 error('### invalid usage');
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42 end
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43
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44 % connection
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45 if ~isa(conn, 'java.sql.Connection')
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46 error('### the first argument should be a java.sql.Connection object');
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47 end
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48
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49 binary = false;
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50 if ischar(varargin{1}) && strcmpi(varargin{1}, 'binary')
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51 % binary
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52 binary = true;
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53 varargin = varargin(2:end);
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54 utils.helper.msg(msg.PROC1, 'binary retrieve');
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55 end
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56
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57 if ischar(varargin{1}) && strcmpi(varargin{1}, 'collection')
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58 % collection
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59 cid = varargin{2};
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60 varargin = varargin(3:end);
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61 if ~isempty(varargin)
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62 error('### wrong number of arguments');
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63 end
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64 utils.helper.msg(msg.PROC1, 'retrieving collection %d', cid);
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65
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66 % get list of object IDs from the collection ID
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67 ids = utils.repository.getCollectionIDs(conn, cid);
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68
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69 else
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70 % IDs list
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71 if isnumeric([varargin{:}])
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72 ids = [varargin{:}];
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73 else
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74 error('### invalid usage');
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75 end
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76 end
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77
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78 utils.helper.msg(msg.PROC1, ['retrieving objects' sprintf(' %d', ids)]);
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79
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80 % output vector
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81 objs = [];
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82
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83 try
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84
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85 % get username and user id
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86 [username, userid] = utils.repository.getUser(conn);
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87
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88 v = ver('LTPDA');
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89 for j=1:length(ids)
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90
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91 rows = utils.mysql.execute(conn, 'SELECT version, obj_type FROM objmeta WHERE obj_id = ?', ids(j));
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92 if isempty(rows)
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93 error('### object %d not found', ids(j));
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94 end
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95 objver = rows{1};
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96 objtype = rows{2};
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97
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98 % it is only possible to download the object if the object in the
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99 % database was submitted with the same or lower LTPDA version as
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100 % the current version
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101 if utils.helper.ver2num(v.Version) < utils.helper.ver2num(objver)
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102 error(['### object %d was submitted with newer LTPDA version (%s) '...
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103 'than this one (%s). please update'], ids(j), objver, v.Version);
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104 end
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105
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106 if binary
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107 % binary download
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108
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109 % Retrieve the bytes
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110 rows = utils.mysql.execute(conn, 'SELECT mat FROM bobjs WHERE obj_id = ?', ids(j));
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111 if isempty(rows)
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112 error('### failed to get binary data for object %d', ids(j));
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113 end
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114 dd = rows{1};
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115
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116 % Write bytes out to a temp MAT file
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117 fname = [tempname '.mat'];
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118 fd = fopen(fname, 'w+');
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119 fwrite(fd, dd, 'int8');
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120 fclose(fd);
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121 % Load the MAT data to a structure
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122 obj = load(fname);
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123 % Delete temp file
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124 delete(fname);
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125 % Get the struct out
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126 obj = obj.objs;
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127
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128 % Check if the retrieved object is a struct
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129 if isstruct(obj)
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130 % Call the constructor with this struct
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131 fcn_name = [objtype '.update_struct'];
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132 obj = feval(fcn_name, obj, obj.tbxver);
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133 obj = feval(objtype, obj);
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134 end
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135 % Add tyo object array
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136 objs = [objs {obj}];
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137
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138 else
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139 % xml download
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140
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141 % get xml
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142 rows = utils.mysql.execute(conn, 'SELECT xml FROM objs WHERE id = ?', ids(j));
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143 if isempty(rows)
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144 error('### failed to get data for object %d', ids(j));
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145 end
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146
10
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147 % check xml
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148 if strcmp(rows{1}(1:13), 'binary submit')
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149 error('### object %d has binary representation only', ids(j));
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150 end
49
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151
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152 % parse xml
7
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153 stream = java.io.StringBufferInputStream(java.lang.String(rows{1}));
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154 builder = javax.xml.parsers.DocumentBuilderFactory.newInstance.newDocumentBuilder();
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155 xdoc = builder.parse(stream);
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156 obj = utils.xml.xmlread(xdoc);
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157
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158 % add to output array
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159 objs = [objs {obj}];
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160
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161 % make transaction entry
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162 t = time().format('yyyy-mm-dd HH:MM:SS', 'UTC');
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163 utils.mysql.execute(conn, ['INSERT INTO transactions (obj_id, user_id, transdate, direction) ' ...
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164 'VALUES (?, ?, ?, ?)'], ids(j), userid, t, 'out');
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165 utils.helper.msg(msg.PROC1, 'updated transactions table');
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166 end
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167
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168 end
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169
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170 catch ex
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171 utils.helper.msg(msg.PROC1, '### retrieve error');
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172 rethrow(ex)
0
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173 end
7
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174
0
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175 % Set outputs
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176 if nargout == 1
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177 if length(objs) == 1
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178 varargout{1} = objs{1};
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179 else
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180 varargout{1} = objs;
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181 end
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182 else
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183 for k=1:nargout
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184 varargout{k} = objs{k};
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185 end
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186 end
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187 end