Merge pull request #731 from ariksher-nex/feature/gen-display-no-alloc

[Java] Avoid memory allocation at varDataDisplay

Author: mjpt777

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

@@ -3269,7 +3269,16 @@ private void appendDecoderDisplay(
             }
             else
             {
-                append(sb, indent, "builder.append('\\'').append(" + varDataName + "()).append('\\'');");
+                if (characterEncoding.contains("ASCII"))
+                {
+                    append(sb, indent, "builder.append('\\'');");
+                    append(sb, indent, formatGetterName(varDataToken.name()) + "(builder);");
+                    append(sb, indent, "builder.append('\\'');");
+                }
+                else
+                {
+                    append(sb, indent, "builder.append('\\'').append(" + varDataName + "()).append('\\'');");
+                }
             }
 
             lengthBeforeLastGeneratedSeparator = sb.length();

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

@@ -158,6 +158,18 @@ public static String formatPropertyName(final String value)
         return formattedValue;
     }
 
+    /**
+     * Format a Getter name for generated code.
+     * <p>
+     *
+     * @param value to be formatted.
+     * @return the string formatted as a getter name.
+     */
+    public static String formatGetterName(final String value)
+    {
+        return "get" + Generators.toUpperFirstChar(value);
+    }
+
     /**
      * Format a class name for the generated code.
      *