data_file.rb in avro-1.11.0

- old
+ new

@@ -1,15 +1,16 @@
+# frozen_string_literal: true
 # 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
-# 
+#
 # https://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.
@@ -23,11 +24,11 @@
     MAGIC.force_encoding('BINARY') if MAGIC.respond_to?(:force_encoding)
     MAGIC_SIZE = MAGIC.respond_to?(:bytesize) ? MAGIC.bytesize : MAGIC.size
     SYNC_SIZE = 16
     SYNC_INTERVAL = 4000 * SYNC_SIZE
     META_SCHEMA = Schema.parse('{"type": "map", "values": "bytes"}')
-    VALID_ENCODINGS = ['binary'] # not used yet
+    VALID_ENCODINGS = ['binary'].freeze # not used yet
 
     class DataFileError < AvroError; end
 
     def self.open(file_path, mode='r', schema=nil, codec=nil)
       schema = Avro::Schema.parse(schema) if schema
@@ -97,10 +98,10 @@
         # If writers_schema is not present, presume we're appending
         @writer = writer
         @encoder = IO::BinaryEncoder.new(@writer)
         @datum_writer = datum_writer
         @meta = meta
-        @buffer_writer = StringIO.new('', 'w')
+        @buffer_writer = StringIO.new(+'', 'w')
         @buffer_writer.set_encoding('BINARY') if @buffer_writer.respond_to?(:set_encoding)
         @buffer_encoder = IO::BinaryEncoder.new(@buffer_writer)
         @block_count = 0
 
         if writers_schema