add utility methods to deal with Solr ordered hash maps

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@521084 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -15,4 +15,5 @@ require 'solr/exception'
 require 'solr/request'
 require 'solr/connection'
 require 'solr/response'
+require 'solr/util'
 require 'solr/xml'

client/ruby/solr-ruby/lib/solr/response/standard.rb

@@ -39,9 +39,8 @@ class Solr::Response::Standard < Solr::Response::Ruby
   def field_facets(field)
     facets = []
     values = @data['facet_counts']['facet_fields'][field]
-    0.upto(values.size / 2 - 1) do |i|
-      n = i * 2
-      facets << FacetValue.new(values[n], values[n+1])
+    Solr::Util.paired_array_each(values) do |key, value|
+      facets << FacetValue.new(key, value)
     end
     
     facets

client/ruby/solr-ruby/lib/solr/util.rb

@@ -0,0 +1,34 @@
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+class Solr::Util
+  # paired_array_each([key1,value1,key2,value2]) yields twice:
+  #     |key1,value1|  and |key2,value2|
+  def self.paired_array_each(a, &block)
+    0.upto(a.size / 2 - 1) do |i|
+      n = i * 2
+      yield(a[n], a[n+1])
+    end
+  end
+
+  # paired_array_to_hash([key1,value1,key2,value2]) => {key1 => value1, key2, value2}
+  def self.paired_array_to_hash(a)
+    h = {}
+    
+    paired_array_each(a) do |key,value|
+      h[key] = value
+    end
+    
+    h
+  end
+  
+end

client/ruby/solr-ruby/test/unit/util_test.rb

@@ -0,0 +1,22 @@
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'solr'
+require 'test/unit'
+
+class UtilTest < Test::Unit::TestCase
+
+  def test_paired_array_to_hash
+    assert_equal({:key1 => :value1, :key2 => :value2}, Solr::Util.paired_array_to_hash([:key1, :value1, :key2, :value2]))
+  end
+
+end