[Java] Don't repeat lookup of limit when wrapping a group.

Author: mjpt777

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

@@ -368,11 +368,12 @@ private void generateGroupDecoderClassHeader(
  indent + " {\n" +
  indent + " this.buffer = buffer;\n" +
  indent + " }\n" +
- indent + " dimensions.wrap(buffer, parentMessage.limit());\n" +
+ indent + " final int limit = parentMessage.limit();\n" +
+ indent + " dimensions.wrap(buffer, limit);\n" +
  indent + " blockLength = (int)dimensions.blockLength();\n" +
  indent + " count = (int)dimensions.numInGroup();\n" +
  indent + " index = -1;\n" +
- indent + " parentMessage.limit(parentMessage.limit() + HEADER_SIZE);\n" +
+ indent + " parentMessage.limit(limit + HEADER_SIZE);\n" +
  indent + " }\n\n",
  readOnlyBuffer));
 
@@ -468,12 +469,13 @@ private void generateGroupEncoderClassHeader(
  ind + " {\n" +
  ind + " this.buffer = buffer;\n" +
  ind + " }\n\n" +
- ind + " dimensions.wrap(buffer, parentMessage.limit());\n" +
+ ind + " final int limit = parentMessage.limit();\n" +
+ ind + " dimensions.wrap(buffer, limit);\n" +
  ind + " dimensions.blockLength((%5$s)%6$d);\n" +
  ind + " dimensions.numInGroup((%7$s)count);\n" +
  ind + " index = -1;\n" +
  ind + " this.count = count;\n" +
- ind + " parentMessage.limit(parentMessage.limit() + HEADER_SIZE);\n" +
+ ind + " parentMessage.limit(limit + HEADER_SIZE);\n" +
  ind + " }\n\n",
  parentMessageClassName,
  mutableBuffer,