[Java] Use longs for values too big to store in int

generator/mavgen_java.py

@@ -34,10 +34,20 @@ def generate_enums(basename, xml):
  * ${description}
  */
 public class ${name} {
-${{entry:   public static final int ${name} = ${value}; /* ${description} |${{param:${description}| }} */
-}}
-}
-            ''', en)
+''', en)
+
+        for entry in en.entry:
+            if entry.value > 2147483647:
+                t.write(f, '''
+   public static final long ${name} = ${value}L; /* ${description} |${{param:${description}| }} */
+''', entry)
+            else:
+                t.write(f, '''
+   public static final int ${name} = ${value}; /* ${description} |${{param:${description}| }} */
+''', entry)
+
+        t.write(f, '''
+}''')
         f.close()