And then add Smile impl

Author: cowtowncoder

release-notes/CREDITS

@@ -15,11 +15,11 @@ Fawzi Essam (@iifawzi)
 * Contributed #582: Change defaults for `CBORReadFeature.DECODE_USING_STANDARD_NEGATIVE_BIGINT_ENCODING`
   and `CBORWriteFeature.ENCODE_USING_STANDARD_NEGATIVE_BIGINT_ENCODING` to `true` (enabled)
  (3.0.0)
-* Contribited #591: Change `CBOR` Features defaults for 3.0
+* Contributed #591: Change `CBOR` Features defaults for 3.0
  (3.0.0)
 
 Andy Wilkinson (@wilkinsona)
 
-* Requested #619: (avro, cbor) Add `isEnabled()` methods for format-specific features (like
-  `CBORReadFeature` and `CBORWriteFeature`) to mappers
+* Requested #619: (avro, cbor, ion, smile) Add `isEnabled()` methods for format-specific features
+  (like `CBORReadFeature` and `CBORWriteFeature`) to mappers
  (3.1.0)

release-notes/VERSION

@@ -16,8 +16,8 @@ implementations)
 
 3.1.0 (not yet released)
 
-#619: (avro, cbor, ion) Add `isEnabled()` methods for format-specific features (like
-  `CBORReadFeature` and `CBORWriteFeature`) to mappers
+#619: (avro, cbor, ion, smile) Add `isEnabled()` methods for format-specific features
+  (like `CBORReadFeature` and `CBORWriteFeature`) to mappers
  (requested by Andy W)
 
 3.0.1 (21-Oct-2025)

smile/src/main/java/tools/jackson/dataformat/smile/SmileMapper.java

@@ -173,6 +173,20 @@ public SmileFactory tokenStreamFactory() {
         return (SmileFactory) _streamFactory;
     }
 
+    /*
+    /**********************************************************************
+    /* Format-specific
+    /**********************************************************************
+     */
+
+    public boolean isEnabled(SmileReadFeature f) {
+        return _deserializationConfig.hasFormatFeature(f);
+    }
+
+    public boolean isEnabled(SmileWriteFeature f) {
+        return _serializationConfig.hasFormatFeature(f);
+    }
+
     /*
     /**********************************************************************
     /* Helper class(es)

smile/src/main/java/tools/jackson/dataformat/smile/SmileReadFeature.java

@@ -14,6 +14,8 @@ public enum SmileReadFeature implements FormatFeature
      * or optional. If enabled, it means that only input that starts with the header
      * is accepted as valid; if disabled, header is optional. In latter case,
      * settings for content are assumed to be defaults.
+     *<p>
+     * Feature is enabled by default.
      */
     REQUIRE_HEADER(true)
     ;

smile/src/test/java/tools/jackson/dataformat/smile/mapper/MapperFeaturesTest.java

@@ -3,15 +3,15 @@
 import org.junit.jupiter.api.Test;
 
 import tools.jackson.databind.*;
-import tools.jackson.dataformat.smile.BaseTestForSmile;
-import tools.jackson.dataformat.smile.SmileFactory;
-import tools.jackson.dataformat.smile.SmileMapper;
+
+import tools.jackson.dataformat.smile.*;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class MapperFeaturesTest extends BaseTestForSmile
 {
-    static class Bean {
+    public static class Bean {
         public int value;
     }
 
@@ -35,4 +35,12 @@ public void testIndent() throws Exception
         Bean result = mapper.readValue(smile, 0, smile.length, Bean.class);
         assertEquals(42, result.value);
     }
+
+    // [dataformats-binary#619]
+    @Test
+    void testFormatFeatureDefaults() {
+        SmileMapper mapper = SmileMapper.shared();
+        assertTrue(mapper.isEnabled(SmileReadFeature.REQUIRE_HEADER));
+        assertTrue(mapper.isEnabled(SmileWriteFeature.WRITE_HEADER));
+    }
 }