# File lib/activerdf_redland/redland.rb, line 159
159:         def add(s, p, o)
160:     $activerdflog.debug "adding triple #{s} #{p} #{o}"
161: 
162:                 # verify input
163:                 if s.nil? || p.nil? || o.nil?
164:       $activerdflog.debug "cannot add triple with empty subject, exiting"
165:                   return false
166:                 end 
167:                 
168:                 unless s.respond_to?(:uri) && p.respond_to?(:uri)
169:       $activerdflog.debug "cannot add triple where s/p are not resources, exiting"
170:                   return false
171:                 end
172:         
173:                 begin
174:                   @model.add(wrap(s), wrap(p), wrap(o))                 
175:                         save if ConnectionPool.auto_flush?
176:                 rescue Redland::RedlandError => e
177:                   $activerdflog.warn "RedlandAdapter: adding triple failed in Redland library: #{e}"
178:                   return false
179:                 end           
180:         end