shishkovilja commented on code in PR #12001:
URL: https://github.com/apache/ignite/pull/12001#discussion_r2049265756


##########
modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryUtils.java:
##########
@@ -93,10 +93,76 @@ public class BinaryUtils {
     public static final String MAPPING_FILE_EXTENSION = ".classname";
 
     /** */
-    public static final Map<Class<?>, Byte> PLAIN_CLASS_TO_FLAG = new 
HashMap<>();
+    public static final Map<Class<?>, Byte> PLAIN_CLASS_TO_FLAG = 
Map.ofEntries(
+        Map.entry(Byte.class, GridBinaryMarshaller.BYTE),
+        Map.entry(Short.class, GridBinaryMarshaller.SHORT),
+        Map.entry(Integer.class, GridBinaryMarshaller.INT),
+        Map.entry(Long.class, GridBinaryMarshaller.LONG),
+        Map.entry(Float.class, GridBinaryMarshaller.FLOAT),
+        Map.entry(Double.class, GridBinaryMarshaller.DOUBLE),
+        Map.entry(Character.class, GridBinaryMarshaller.CHAR),
+        Map.entry(Boolean.class, GridBinaryMarshaller.BOOLEAN),
+        Map.entry(BigDecimal.class, GridBinaryMarshaller.DECIMAL),
+        Map.entry(String.class, GridBinaryMarshaller.STRING),
+        Map.entry(UUID.class, GridBinaryMarshaller.UUID),
+        Map.entry(Date.class, GridBinaryMarshaller.DATE),
+        Map.entry(Timestamp.class, GridBinaryMarshaller.TIMESTAMP),
+        Map.entry(Time.class, GridBinaryMarshaller.TIME),
+        Map.entry(byte[].class, GridBinaryMarshaller.BYTE_ARR),
+        Map.entry(short[].class, GridBinaryMarshaller.SHORT_ARR),
+        Map.entry(int[].class, GridBinaryMarshaller.INT_ARR),
+        Map.entry(long[].class, GridBinaryMarshaller.LONG_ARR),
+        Map.entry(float[].class, GridBinaryMarshaller.FLOAT_ARR),
+        Map.entry(double[].class, GridBinaryMarshaller.DOUBLE_ARR),
+        Map.entry(char[].class, GridBinaryMarshaller.CHAR_ARR),
+        Map.entry(boolean[].class, GridBinaryMarshaller.BOOLEAN_ARR),
+        Map.entry(BigDecimal[].class, GridBinaryMarshaller.DECIMAL_ARR),
+        Map.entry(String[].class, GridBinaryMarshaller.STRING_ARR),
+        Map.entry(UUID[].class, GridBinaryMarshaller.UUID_ARR),
+        Map.entry(Date[].class, GridBinaryMarshaller.DATE_ARR),
+        Map.entry(Timestamp[].class, GridBinaryMarshaller.TIMESTAMP_ARR),
+        Map.entry(Time[].class, GridBinaryMarshaller.TIME_ARR),
+        Map.entry(byte.class, GridBinaryMarshaller.BYTE),
+        Map.entry(short.class, GridBinaryMarshaller.SHORT),
+        Map.entry(int.class, GridBinaryMarshaller.INT),
+        Map.entry(long.class, GridBinaryMarshaller.LONG),
+        Map.entry(float.class, GridBinaryMarshaller.FLOAT),
+        Map.entry(double.class, GridBinaryMarshaller.DOUBLE),
+        Map.entry(char.class, GridBinaryMarshaller.CHAR),
+        Map.entry(boolean.class, GridBinaryMarshaller.BOOLEAN)
+    );
 
     /** */
-    public static final Map<Byte, Class<?>> FLAG_TO_CLASS = new HashMap<>();
+    public static final Map<Byte, Class<?>> FLAG_TO_CLASS = Map.ofEntries(

Review Comment:
   As I see `FLAG_TO_CLASS` and `PLAIN_CLASS_TO_FLAG` maps differ only in that 
the second one contains primitive classes, so we can generate `FLAG_TO_CLASS` 
in a such way:
   ```
       public static final Map<Byte, Class<?>> FLAG_TO_CLASS = 
PLAIN_CLASS_TO_FLAG.entrySet()
           .stream()
           .filter(e -> !e.getKey().isPrimitive())
           .collect(Collectors.toUnmodifiableMap(Map.Entry::getValue, 
Map.Entry::getKey));
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryUtils.java:
##########
@@ -93,10 +93,76 @@ public class BinaryUtils {
     public static final String MAPPING_FILE_EXTENSION = ".classname";
 
     /** */
-    public static final Map<Class<?>, Byte> PLAIN_CLASS_TO_FLAG = new 
HashMap<>();
+    public static final Map<Class<?>, Byte> PLAIN_CLASS_TO_FLAG = 
Map.ofEntries(
+        Map.entry(Byte.class, GridBinaryMarshaller.BYTE),

Review Comment:
   Let's do static import of `Map.entry` method in order to avoid unnecessary 
duplications.



##########
modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryUtils.java:
##########
@@ -109,7 +175,12 @@ public class BinaryUtils {
     private static final boolean[] PLAIN_TYPE_FLAG = new boolean[102];
 
     /** Binary classes. */
-    private static final Collection<Class<?>> BINARY_CLS = new HashSet<>();
+    private static final Collection<Class<?>> BINARY_CLS = Set.of(

Review Comment:
   Let's insert each element in a separate line.



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