From 32ad3c8f6e1e16cfe9fd59a47df6b560ffb13ddd Mon Sep 17 00:00:00 2001
From: Christoph Helma <helma@in-silico.ch>
Date: Wed, 1 Aug 2012 14:56:08 +0200
Subject: task error handling improved

---
 lib/error.rb | 56 +++++++++++++++++++++++++++++++-------------------------
 1 file changed, 31 insertions(+), 25 deletions(-)

(limited to 'lib/error.rb')

diff --git a/lib/error.rb b/lib/error.rb
index d1abe52..84918b7 100644
--- a/lib/error.rb
+++ b/lib/error.rb
@@ -7,43 +7,49 @@ class RuntimeError
     super message
     @uri = uri
     @http_code ||= 500
-    $logger.error "\n"+self.to_turtle
+    @rdf = RDF::Graph.new
+    subject = RDF::Node.new
+    @rdf << [subject, RDF.type, RDF::OT.ErrorReport]
+    @rdf << [subject, RDF::OT.actor, @uri.to_s]
+    @rdf << [subject, RDF::OT.message, message.to_s]
+    @rdf << [subject, RDF::OT.statusCode, @http_code]
+    @rdf << [subject, RDF::OT.errorCode, self.class.to_s]
+    @rdf << [subject, RDF::OT.errorCause, short_backtrace]
+    $logger.error("\n"+self.to_turtle)
   end
 
-  # define to_ methods for all RuntimeErrors and various rdf formats
-  RDF_FORMATS.each do |format|
+  def short_backtrace
+    backtrace = caller.collect{|line| line unless line =~ /#{File.dirname(__FILE__)}/}.compact
+    cut_index = backtrace.find_index{|line| line.match /sinatra|minitest/}
+    cut_index ||= backtrace.size
+    cut_index -= 1
+    cut_index = backtrace.size-1 if cut_index < 0
+    backtrace[0..cut_index].join("\n")
+  end
 
+  RDF_FORMATS.each do |format|
+    # rdf serialization methods for all formats e.g. to_rdfxml
     send :define_method, "to_#{format}".to_sym do
-      rdf = RDF::Writer.for(format).buffer do |writer|
-        # TODO: not used for turtle
-        # http://rdf.rubyforge.org/RDF/Writer.html#
-        writer.prefix :ot, RDF::URI('http://www.opentox.org/api/1.2#')
-        writer.prefix :ot1_1, RDF::URI('http://www.opentox.org/api/1.1#')
-        subject = RDF::Node.new
-        writer << [subject, RDF.type, RDF::OT.ErrorReport]
-        writer << [subject, RDF::OT.actor, @uri.to_s]
-        writer << [subject, RDF::OT.message, message.to_s]
-        writer << [subject, RDF::OT.statusCode, @http_code]
-        writer << [subject, RDF::OT.errorCode, self.class.to_s]
-
-        # cut backtrace
-        backtrace = caller.collect{|line| line unless line =~ /#{File.dirname(__FILE__)}/}.compact
-        cut_index = backtrace.find_index{|line| line.match /sinatra|minitest/}
-        cut_index ||= backtrace.size
-        cut_index -= 1
-        cut_index = backtrace.size-1 if cut_index < 0
-        details = backtrace[0..cut_index].join("\n")
-        writer << [subject, RDF::OT.errorCause, details]
+      RDF::Writer.for(format).buffer do |writer|
+        @rdf.each{|statement| writer << statement}
       end
-      rdf
     end
+  end
 
+  def to_turtle # redefine to use prefixes (not supported by RDF::Writer)
+    prefixes = {:rdf => "http://www.w3.org/1999/02/22-rdf-syntax-ns#"}
+    ['OT', 'DC', 'XSD', 'OLO'].each{|p| prefixes[p.downcase.to_sym] = eval("RDF::#{p}.to_s") }
+    RDF::N3::Writer.for(:turtle).buffer(:prefixes => prefixes)  do |writer|
+      @rdf.each{|statement| writer << statement}
+    end
   end
+
 end
 
 module OpenTox
 
   class Error < RuntimeError
+    
     def initialize code, message, uri=nil
       @http_code = code
       super message, uri
@@ -72,7 +78,7 @@ module OpenTox
     
     # define global methods for raising errors, eg. bad_request_error
     Object.send(:define_method, klass.underscore.to_sym) do |message,uri=nil|
-      raise c, message, uri
+      raise c.new(message, uri)
     end
   end
   
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