Merge pull request aeron-io#575 from JerryShea/master

Generate noChoicesSet convenience method for Sets

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaGenerator.java

@@ -1052,6 +1052,7 @@ private void generateBitSet(final List<Token> tokens) throws IOException
  try (Writer out = outputManager.createOutput(decoderName))
  {
  generateFixedFlyweightHeader(token, decoderName, out, readOnlyBuffer, fqReadOnlyBuffer);
+ out.append(generateNoChoicesSet(token.encoding().primitiveType()));
  out.append(generateChoiceDecoders(messageBody));
  out.append(generateChoiceDisplay(messageBody));
  out.append("}\n");
@@ -2740,6 +2741,34 @@ private String generatePut(
  throw new IllegalArgumentException("primitive type not supported: " + type);
  }
 
+ private String generateNoChoicesSet(final PrimitiveType type)
+ {
+ return String.format(
+ "\n public boolean isEmpty()\n" +
+ " {\n" +
+ " return %1$s;\n" +
+ " }\n", generateChoiceUnsetInner(type));
+ }
+
+ private String generateChoiceUnsetInner(PrimitiveType type) {
+ switch (type)
+ {
+ case UINT8:
+ return "0 == buffer.getByte(offset)";
+
+ case UINT16:
+ return "0 == buffer.getShort(offset)";
+
+ case UINT32:
+ return "0 == buffer.getInt(offset)";
+
+ case UINT64:
+ return "0 == buffer.getLong(offset)";
+ }
+
+ throw new IllegalArgumentException("primitive type not supported: " + type);
+ }
+
  private String generateChoiceGet(final PrimitiveType type, final String bitIndex, final String byteOrder)
  {
  switch (type)