Adjust mappers with dependencies to conditionally load

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@538603 13f79535-47bb-0310-9956-ffa450edef68

client/ruby/solr-ruby/lib/solr/importer/hpricot_mapper.rb

@@ -10,11 +10,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require 'hpricot'
+begin
+  require 'hpricot'
 
-# For files with the first line containing field names
-class Solr::Importer::HpricotMapper < Solr::Importer::Mapper
-  def field_data(doc, path)
-    doc.search(path.to_s).collect { |e| e.inner_html }
+  class Solr::Importer::HpricotMapper < Solr::Importer::Mapper
+    def field_data(doc, path)
+      doc.search(path.to_s).collect { |e| e.inner_html }
+    end
+  end
+rescue LoadError => e # If we can't load hpricot
+  class Solr::Importer::HpricotMapper
+    def initialize(mapping, options={})
+      raise "Hpricot not installed."
+    end
   end
 end

client/ruby/solr-ruby/lib/solr/importer/xpath_mapper.rb

@@ -10,18 +10,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require 'xml/libxml'
+begin
+  require 'xml/libxml'
 
-# For files with the first line containing field names
-class Solr::Importer::XPathMapper < Solr::Importer::Mapper
-  def field_data(doc, xpath)
-    doc.find(xpath.to_s).collect do |node|
-      case node
-        when XML::Attr
-          node.value
-        when XML::Node
-          node.content
+  # For files with the first line containing field names
+  class Solr::Importer::XPathMapper < Solr::Importer::Mapper
+    def field_data(doc, xpath)
+      doc.find(xpath.to_s).collect do |node|
+        case node
+          when XML::Attr
+            node.value
+          when XML::Node
+            node.content
+        end
       end
     end
   end
+rescue LoadError => e # If we can't load libxml
+  class Solr::Importer::XPathMapper
+    def initialize(mapping, options={})
+      raise "libxml not installed"
+    end
+  end
 end