Minor work related to #179, but can't fix for 2.10

Author: cowtowncoder

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroFactory.java

@@ -167,7 +167,12 @@ public AvroFactory copy()
     public boolean requiresPropertyOrdering() {
         return true;
     }
-    
+
+    @Override // since 2.10 (should have been earlier)
+    public boolean canHandleBinaryNatively() {
+        return true;
+    }
+
     /*
     /**********************************************************
     /* Serializable overrides

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroGenerator.java

@@ -205,11 +205,6 @@ public int getOutputBuffered() {
         return -1;
     }
 
-    @Override
-    public boolean canUseSchema(FormatSchema schema) {
-        return (schema instanceof AvroSchema);
-    }
-
     @Override public AvroSchema getSchema() {
         return _rootSchema;
     }
@@ -224,6 +219,22 @@ public void setSchema(FormatSchema schema)
         setSchema((AvroSchema) schema);
     }
 
+    /*
+    /**********************************************************
+    /* Public API, capability introspection methods
+    /**********************************************************
+     */
+
+    @Override
+    public boolean canUseSchema(FormatSchema schema) {
+        return (schema instanceof AvroSchema);
+    }
+
+    // 10-Sep-2019, Tatu: Should implement wrt [dataformats-binary#179], but...
+    //    can't. Not yet, will just break things. Wait until 2.11
+//    @Override
+//    public boolean canWriteBinaryNatively() { return true; }
+
     /*
     /**********************************************************
     /* Extended API, configuration

avro/src/test/java/com/fasterxml/jackson/dataformat/avro/UUIDTest.java

@@ -0,0 +1,33 @@
+package com.fasterxml.jackson.dataformat.avro;
+
+import java.util.UUID;
+
+// @since 2.10
+public class UUIDTest extends AvroTestBase
+{
+    static class UUIDWrapper {
+        public UUID id;
+
+        protected UUIDWrapper() { }
+        public UUIDWrapper(UUID u) { id = u; }
+    }
+
+    private final AvroMapper MAPPER = newMapper();
+
+    // 10-Sep-2019, tatu: as per [dataformats-binary#179], should really serialize
+    //   UUID as binary, but due to various complications can not make it work
+    //   safely and reliably with 2.10; can only add some foundational support.
+    public void testUUIDRoundtrip() throws Exception
+    {
+        final AvroSchema schema = MAPPER.schemaFor(UUIDWrapper.class);
+//System.err.println("DEBUG: schema -> "+schema.getAvroSchema());
+        UUIDWrapper input = new UUIDWrapper(UUID.nameUUIDFromBytes("BOGUS".getBytes("UTF-8")));
+        byte[] avro = MAPPER.writer(schema).writeValueAsBytes(input);
+
+        UUIDWrapper output = MAPPER.readerFor(UUIDWrapper.class)
+                .with(schema)
+                .readValue(avro);
+
+        assertEquals(input.id, output.id);
+    }
+}