[shared] Remove TagTransformer and improve TagWriter

OpenTelemetry.sln

@@ -260,8 +260,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Shared", "Shared", "{A49299
  src\Shared\SemanticConventions.cs = src\Shared\SemanticConventions.cs
  src\Shared\SpanAttributeConstants.cs = src\Shared\SpanAttributeConstants.cs
  src\Shared\StatusHelper.cs = src\Shared\StatusHelper.cs
- src\Shared\TagTransformer.cs = src\Shared\TagTransformer.cs
- src\Shared\TagTransformerJsonHelper.cs = src\Shared\TagTransformerJsonHelper.cs
  src\Shared\ThreadSafeRandom.cs = src\Shared\ThreadSafeRandom.cs
  EndProjectSection
 EndProject

src/OpenTelemetry.Exporter.Console/Implementation/ConsoleTagWriter.cs

@@ -51,10 +51,10 @@ protected override void WriteBooleanTag(ref ConsoleTag consoleTag, string key, b
  consoleTag.Value = value ? "true" : "false";
  }
 
- protected override void WriteStringTag(ref ConsoleTag consoleTag, string key, string value)
+ protected override void WriteStringTag(ref ConsoleTag consoleTag, string key, ReadOnlySpan<char> value)
  {
  consoleTag.Key = key;
- consoleTag.Value = value;
+ consoleTag.Value = value.ToString();
  }
 
  protected override void WriteArrayTag(ref ConsoleTag consoleTag, string key, ArraySegment<byte> arrayUtf8JsonBytes)

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpTagWriter.cs

@@ -45,9 +45,9 @@ protected override void WriteBooleanTag(ref RepeatedField<OtlpCommon.KeyValue> t
  tags.Add(new OtlpCommon.KeyValue { Key = key, Value = ToAnyValue(value) });
  }
 
- protected override void WriteStringTag(ref RepeatedField<OtlpCommon.KeyValue> tags, string key, string value)
+ protected override void WriteStringTag(ref RepeatedField<OtlpCommon.KeyValue> tags, string key, ReadOnlySpan<char> value)
  {
- tags.Add(new OtlpCommon.KeyValue { Key = key, Value = ToAnyValue(value) });
+ tags.Add(new OtlpCommon.KeyValue { Key = key, Value = ToAnyValue(value.ToString()) });
  }
 
  protected override void WriteArrayTag(ref RepeatedField<OtlpCommon.KeyValue> tags, string key, ref OtlpCommon.ArrayValue value)
@@ -95,9 +95,9 @@ public override void WriteBooleanValue(ref OtlpCommon.ArrayValue array, bool val
  array.Values.Add(ToAnyValue(value));
  }
 
- public override void WriteStringValue(ref OtlpCommon.ArrayValue array, string value)
+ public override void WriteStringValue(ref OtlpCommon.ArrayValue array, ReadOnlySpan<char> value)
  {
- array.Values.Add(ToAnyValue(value));
+ array.Values.Add(ToAnyValue(value.ToString()));
  }
 
  public override void EndWriteArray(ref OtlpCommon.ArrayValue array)

src/OpenTelemetry.Exporter.Zipkin/Implementation/ZipkinTagWriter.cs

@@ -49,7 +49,7 @@ protected override void WriteFloatingPointTag(ref Utf8JsonWriter writer, string
  protected override void WriteBooleanTag(ref Utf8JsonWriter writer, string key, bool value)
  => writer.WriteString(key, value ? "true" : "false");
 
- protected override void WriteStringTag(ref Utf8JsonWriter writer, string key, string value)
+ protected override void WriteStringTag(ref Utf8JsonWriter writer, string key, ReadOnlySpan<char> value)
  => writer.WriteString(key, value);
 
  protected override void WriteArrayTag(ref Utf8JsonWriter writer, string key, ArraySegment<byte> arrayUtf8JsonBytes)

src/Shared/TagWriter/ArrayTagWriter.cs

@@ -18,7 +18,7 @@ internal abstract class ArrayTagWriter<TArrayState>
 
  public abstract void WriteBooleanValue(ref TArrayState state, bool value);
 
- public abstract void WriteStringValue(ref TArrayState state, string value);
+ public abstract void WriteStringValue(ref TArrayState state, ReadOnlySpan<char> value);
 
  public abstract void EndWriteArray(ref TArrayState state);
 }

src/Shared/TagWriter/JsonStringArrayTagWriter.cs

@@ -75,7 +75,7 @@ public override void WriteNullValue(ref JsonArrayTagWriterState state)
  state.Writer.WriteNullValue();
  }
 
- public override void WriteStringValue(ref JsonArrayTagWriterState state, string value)
+ public override void WriteStringValue(ref JsonArrayTagWriterState state, ReadOnlySpan<char> value)
  {
  state.Writer.WriteStringValue(value);
  }