[Java]: Reordered OTF example for a better logical flow.

Author: mjpt777

examples/java/uk/co/real_logic/sbe/examples/OtfExample.java

@@ -55,10 +55,15 @@ public static void main(final String[] args) throws Exception
  encodedSchemaBuffer.flip();
  final IntermediateRepresentation ir = decodeIr(encodedSchemaBuffer);
 
+ // From the IR we can create OTF decoders for messages.
+ final OtfHeaderDecoder headerDecoder = new OtfHeaderDecoder(ir.headerStructure());
+ final OtfMessageDecoder messageDecoder
+ = new OtfMessageDecoder(new OtfGroupSizeDecoder(ir.getType(OtfGroupSizeDecoder.GROUP_SIZE_ENCODING_NAME)),
+ new OtfVarDataDecoder(ir.getType(OtfVarDataDecoder.VAR_DATA_ENCODING_NAME)));
+
  // Now we have IR we can read the message header
  int bufferOffset = 0;
  final DirectBuffer buffer = new DirectBuffer(encodedMsgBuffer);
- final OtfHeaderDecoder headerDecoder = new OtfHeaderDecoder(ir.headerStructure());
 
  final int templateId = headerDecoder.getTemplateId(buffer, bufferOffset);
  final int actingVersion = headerDecoder.getTemplateVersion(buffer, bufferOffset);
@@ -68,11 +73,9 @@ public static void main(final String[] args) throws Exception
 
  // Given the header information we can select the appropriate message template to do the decode.
  // The OTF Java classes are thread safe so the same instances can be reused across multiple threads.
- final OtfGroupSizeDecoder groupSizeDecoder = new OtfGroupSizeDecoder(ir.getType(OtfGroupSizeDecoder.GROUP_SIZE_ENCODING_NAME));
- final OtfVarDataDecoder varDataDecoder = new OtfVarDataDecoder(ir.getType(OtfVarDataDecoder.VAR_DATA_ENCODING_NAME));
+
  final List<Token> msgTokens = ir.getMessage(templateId);
 
- final OtfMessageDecoder messageDecoder = new OtfMessageDecoder(groupSizeDecoder, varDataDecoder);
  bufferOffset = messageDecoder.decode(buffer,
  bufferOffset,
  actingVersion,