1 files changed, 58 insertions, 0 deletions
diff --git a/src/arrow/ruby/red-arrow/lib/arrow/decimal128-array-builder.rb b/src/arrow/ruby/red-arrow/lib/arrow/decimal128-array-builder.rb
new file mode 100644
index 000000000..d380ce070
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+++ b/src/arrow/ruby/red-arrow/lib/arrow/decimal128-array-builder.rb
@@ -0,0 +1,58 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  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.
+
+module Arrow
+  class Decimal128ArrayBuilder
+    class << self
+      def build(data_type, values)
+        builder = new(data_type)
+        builder.build(values)
+      end
+    end
+
+    alias_method :append_value_raw, :append_value
+    def append_value(value)
+      append_value_raw(normalize_value(value))
+    end
+
+    alias_method :append_values_raw, :append_values
+    def append_values(values, is_valids=nil)
+      if values.is_a?(::Array)
+        values = values.collect do |value|
+          normalize_value(value)
+        end
+        append_values_raw(values, is_valids)
+      else
+        append_values_packed(values, is_valids)
+      end
+    end
+
+    private
+    def normalize_value(value)
+      case value
+      when String
+        Decimal128.new(value)
+      when Float
+        Decimal128.new(value.to_s)
+      when BigDecimal
+        Decimal128.new(value.to_s)
+      else
+        value
+      end
+    end
+  end
+end