has_method support for primitive fields in java runtime. Changed: idl.h, FlatBufferBuilder.java , idl_gen_general.cpp, idl_parser.cpp, flatc.cpp (#5468)

* has_method support for primitive fields in java runtime

* adding the new flag to flatc

* addressing the review comments

1 files changed, 11 insertions, 0 deletions

diff --git a/java/com/google/flatbuffers/FlatBufferBuilder.java b/java/com/google/flatbuffers/FlatBufferBuilder.java
index f224610c..4fe1c42a 100644
--- a/java/com/google/flatbuffers/FlatBufferBuilder.java
+++ b/java/com/google/flatbuffers/FlatBufferBuilder.java
@@ -199,6 +199,17 @@ public class FlatBufferBuilder {
         }
     }
 
+   /**
+   * Helper function to test if a field is present in the table
+   *
+   * @param table Flatbuffer table
+   * @param offset virtual table offset
+   * @return true if the filed is present
+   */
+   public static boolean isFieldPresent(Table table, int offset) {
+     return table.__offset(offset) != 0;
+   }
+
     /**
      * Reset the FlatBufferBuilder by purging all data that it holds.
      */