1 | class Relation < ActiveRecord::Base |
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2 | require 'xml/libxml' |
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3 | |
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4 | belongs_to :user |
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5 | |
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6 | has_many :relation_members, :foreign_key => 'id' |
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7 | has_many :relation_tags, :foreign_key => 'id' |
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8 | |
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9 | has_many :old_relations, :foreign_key => 'id', :order => 'version' |
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10 | |
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11 | set_table_name 'current_relations' |
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12 | |
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13 | def self.from_xml(xml, create=false) |
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14 | begin |
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15 | p = XML::Parser.new |
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16 | p.string = xml |
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17 | doc = p.parse |
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18 | |
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19 | relation = Relation.new |
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20 | |
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21 | doc.find('//osm/relation').each do |pt| |
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22 | if !create and pt['id'] != '0' |
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23 | relation.id = pt['id'].to_i |
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24 | end |
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25 | |
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26 | if create |
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27 | relation.timestamp = Time.now |
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28 | relation.visible = true |
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29 | else |
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30 | if pt['timestamp'] |
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31 | relation.timestamp = Time.parse(pt['timestamp']) |
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32 | end |
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33 | end |
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34 | |
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35 | pt.find('tag').each do |tag| |
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36 | relation.add_tag_keyval(tag['k'], tag['v']) |
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37 | end |
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38 | |
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39 | pt.find('member').each do |member| |
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40 | relation.add_member(member['type'], member['ref'], member['role']) |
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41 | end |
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42 | end |
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43 | rescue |
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44 | relation = nil |
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45 | end |
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46 | |
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47 | return relation |
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48 | end |
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49 | |
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50 | def to_xml |
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51 | doc = OSM::API.new.get_xml_doc |
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52 | doc.root << to_xml_node() |
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53 | return doc |
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54 | end |
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55 | |
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56 | def to_xml_node(user_display_name_cache = nil) |
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57 | el1 = XML::Node.new 'relation' |
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58 | el1['id'] = self.id.to_s |
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59 | el1['visible'] = self.visible.to_s |
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60 | el1['timestamp'] = self.timestamp.xmlschema |
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61 | |
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62 | user_display_name_cache = {} if user_display_name_cache.nil? |
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63 | |
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64 | if user_display_name_cache and user_display_name_cache.key?(self.user_id) |
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65 | # use the cache if available |
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66 | elsif self.user.data_public? |
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67 | user_display_name_cache[self.user_id] = self.user.display_name |
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68 | else |
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69 | user_display_name_cache[self.user_id] = nil |
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70 | end |
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71 | |
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72 | el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil? |
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73 | |
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74 | self.relation_members.each do |member| |
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75 | p=0 |
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76 | #if visible_members |
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77 | # # if there is a list of visible members then use that to weed out deleted segments |
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78 | # if visible_members[member.member_type][member.member_id] |
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79 | # p=1 |
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80 | # end |
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81 | #else |
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82 | # otherwise, manually go to the db to check things |
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83 | if member.member.visible? |
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84 | p=1 |
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85 | end |
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86 | #end |
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87 | if p |
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88 | e = XML::Node.new 'member' |
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89 | e['type'] = member.member_type |
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90 | e['ref'] = member.member_id.to_s |
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91 | e['role'] = member.member_role |
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92 | el1 << e |
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93 | end |
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94 | end |
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95 | |
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96 | self.relation_tags.each do |tag| |
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97 | e = XML::Node.new 'tag' |
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98 | e['k'] = tag.k |
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99 | e['v'] = tag.v |
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100 | el1 << e |
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101 | end |
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102 | return el1 |
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103 | end |
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104 | |
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105 | # FIXME is this really needed? |
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106 | def members |
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107 | unless @members |
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108 | @members = Array.new |
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109 | self.relation_members.each do |member| |
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110 | @members += [[member.member_type,member.member_id,member.member_role]] |
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111 | end |
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112 | end |
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113 | @members |
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114 | end |
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115 | |
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116 | def tags |
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117 | unless @tags |
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118 | @tags = Hash.new |
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119 | self.relation_tags.each do |tag| |
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120 | @tags[tag.k] = tag.v |
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121 | end |
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122 | end |
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123 | @tags |
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124 | end |
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125 | |
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126 | def members=(m) |
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127 | @members = m |
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128 | end |
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129 | |
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130 | def tags=(t) |
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131 | @tags = t |
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132 | end |
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133 | |
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134 | def add_member(type,id,role) |
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135 | @members = Array.new unless @members |
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136 | @members += [[type,id,role]] |
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137 | end |
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138 | |
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139 | def add_tag_keyval(k, v) |
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140 | @tags = Hash.new unless @tags |
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141 | @tags[k] = v |
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142 | end |
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143 | |
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144 | def save_with_history! |
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145 | Relation.transaction do |
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146 | t = Time.now |
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147 | self.timestamp = t |
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148 | self.save! |
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149 | |
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150 | tags = self.tags |
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151 | |
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152 | RelationTag.delete_all(['id = ?', self.id]) |
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153 | |
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154 | tags.each do |k,v| |
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155 | tag = RelationTag.new |
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156 | tag.k = k |
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157 | tag.v = v |
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158 | tag.id = self.id |
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159 | tag.save! |
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160 | end |
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161 | |
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162 | members = self.members |
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163 | |
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164 | RelationMember.delete_all(['id = ?', self.id]) |
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165 | |
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166 | members.each do |n| |
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167 | mem = RelationMember.new |
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168 | mem.id = self.id |
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169 | mem.member_type = n[0]; |
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170 | mem.member_id = n[1]; |
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171 | mem.member_role = n[2]; |
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172 | mem.save! |
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173 | end |
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174 | |
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175 | old_relation = OldRelation.from_relation(self) |
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176 | old_relation.timestamp = t |
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177 | old_relation.save_with_dependencies! |
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178 | end |
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179 | end |
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180 | |
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181 | def preconditions_ok? |
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182 | self.members.each do |m| |
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183 | if (m[0] == "node") |
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184 | n = Node.find(:first, :conditions => ["id = ?", m[1]]) |
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185 | unless n and n.visible |
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186 | return false |
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187 | end |
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188 | elsif (m[0] == "way") |
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189 | w = Way.find(:first, :conditions => ["id = ?", m[1]]) |
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190 | unless w and w.visible and w.preconditions_ok? |
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191 | return false |
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192 | end |
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193 | elsif (m[0] == "relation") |
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194 | e = Relation.find(:first, :conditions => ["id = ?", m[1]]) |
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195 | unless e and e.visible and e.preconditions_ok? |
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196 | return false |
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197 | end |
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198 | else |
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199 | return false |
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200 | end |
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201 | end |
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202 | return true |
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203 | rescue |
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204 | return false |
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205 | end |
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206 | |
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207 | end |
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