Fix #780: add XmlMapper.isEnabled() methods (#781)

Author: cowtowncoder

release-notes/VERSION

@@ -5,6 +5,10 @@ Version: 3.x (for earlier see VERSION-2.x)
 === Releases === 
 ------------------------------------------------------------------------
 
+3.1.0 (not yet released)
+
+#780: Add `isEnabled()` methods for format-specific features to mappers
+
 3.0.1 (21-Oct-2025)
 
 No changes since 3.0.0

src/main/java/tools/jackson/dataformat/xml/XmlMapper.java

@@ -458,6 +458,21 @@ public XmlFactory tokenStreamFactory() {
         return (XmlFactory) _streamFactory;
     }
 
+    /*
+    /**********************************************************************
+    /* Format-specific
+    /**********************************************************************
+     */
+
+    public boolean isEnabled(XmlReadFeature f) {
+        return _deserializationConfig.hasFormatFeature(f);
+    }
+
+    public boolean isEnabled(XmlWriteFeature f) {
+        return _serializationConfig.hasFormatFeature(f);
+    }
+
+
     /*
     /**********************************************************************
     /* XML-specific access

src/test/java/tools/jackson/dataformat/xml/FeatureDefaultsTest.java

@@ -6,6 +6,7 @@
 import tools.jackson.databind.ObjectWriter;
 
 import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class FeatureDefaultsTest extends XmlTestUtil
 {
@@ -24,4 +25,13 @@ public void testSerDefaults() throws Exception
         ObjectWriter w = MAPPER.writer();
         assertNotSame(w, w.with(XmlWriteFeature.WRITE_XML_1_1));
     }
+
+    // [dataformat-xml#780]
+    @Test
+    void testFeaturesViaMapper() {
+        XmlMapper mapper = XmlMapper.shared();
+        assertTrue(mapper.isEnabled(XmlReadFeature.AUTO_DETECT_XSI_TYPE));
+        assertTrue(mapper.isEnabled(XmlWriteFeature.AUTO_DETECT_XSI_TYPE));
+        
+    }
 }