Fixed #3001

release-notes/VERSION-2.x

@@ -7,7 +7,10 @@ Project: jackson-databind
 2.13.0 (not yet released)
 
 #2828: Add `DatabindException` as intermediate subtype of `JsonMappingException`
+#3001: Add mechanism for setting default `ContextAttributes` for `ObjectMapper`
 #3035: Add `removeMixIn()` method in `MapperBuilder`
+#3036: Backport `MapperBuilder` lambda-taking methods: `withConfigOverride()`,
+  `withCoercionConfig()`, `withCoercionConfigDefaults()`
 
 2.12.2 (not yet released)
 

src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java

@@ -2426,6 +2426,20 @@ public ObjectMapper setTimeZone(TimeZone tz) {
         return this;
     }
 
+    /**
+     *<p>
+     * NOTE: preferred way to set the defaults is to use {@code Builder} style
+     * construction, see {@link com.fasterxml.jackson.databind.json.JsonMapper#builder}
+     * (and {@link MapperBuilder#defaultAttributes}).
+     *
+     * @since 2.13
+     */
+    public ObjectMapper setDefaultAttributes(ContextAttributes attrs) {
+        _deserializationConfig = _deserializationConfig.with(attrs);
+        _serializationConfig = _serializationConfig.with(attrs);
+        return this;
+    }
+
     /*
     /**********************************************************
     /* Configuration, simple features: MapperFeature
@@ -2760,8 +2774,7 @@ public boolean isEnabled(StreamWriteFeature f) {
     /*
     /**********************************************************
     /* Public API (from ObjectCodec): deserialization
-    /* (mapping from JSON to Java types);
-    /* main methods
+    /* (mapping from JSON to Java types); main methods
     /**********************************************************
      */
 

src/main/java/com/fasterxml/jackson/databind/cfg/MapperBuilder.java

@@ -419,6 +419,23 @@ public B annotationIntrospector(AnnotationIntrospector intr) {
         return _this();
     }
 
+    /**
+     * Method for replacing default {@link ContextAttributes} that the mapper
+     * uses: usually one initialized with a set of default shared attributes, but
+     * potentially also with a custom implementation.
+     *<p>
+     * NOTE: instance specified will need to be thread-safe for usage, similar to the
+     * default ({@link ContextAttributes.Impl}).
+     *
+     * @param attrs Default instance to use: may not be {@code null}.
+     *
+     * @return This Builder instance to allow call chaining
+     */
+    public B defaultAttributes(ContextAttributes attrs) {
+        _mapper.setDefaultAttributes(attrs);
+        return _this();
+    }
+
     /*
     /**********************************************************************
     /* Changing introspection helpers

src/test/java/com/fasterxml/jackson/databind/contextual/TestContextAttributeWithDeser.java

@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.core.*;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.cfg.ContextAttributes;
 import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
 
 public class TestContextAttributeWithDeser extends BaseMapTest
@@ -92,4 +93,29 @@ public void testHierarchic() throws Exception
         assertEquals("x/2", pojos2[0].value);
         assertEquals("y/3", pojos2[1].value);
     }
+
+    // [databind#3001]
+    public void testDefaultsViaMapper() throws Exception
+    {
+        final String INPUT = aposToQuotes("{'value':'x'}");
+        ContextAttributes attrs = ContextAttributes.getEmpty()
+                .withSharedAttribute(KEY, Integer.valueOf(72));
+        ObjectMapper mapper = jsonMapperBuilder()
+                .defaultAttributes(attrs)
+                .build();
+        TestPOJO pojo = mapper.readerFor(TestPOJO.class)
+                .readValue(INPUT);
+        assertEquals("x/72", pojo.value);
+
+        // as above, should not carry on state
+        TestPOJO pojo2 = mapper.readerFor(TestPOJO.class)
+                .readValue(INPUT);
+        assertEquals("x/72", pojo2.value);
+
+        // And should be overridable too
+        TestPOJO pojo3 = mapper.readerFor(TestPOJO.class)
+                .withAttribute(KEY, Integer.valueOf(19))
+                .readValue(INPUT);
+        assertEquals("x/19", pojo3.value);
+    }
 }

src/test/java/com/fasterxml/jackson/databind/contextual/TestContextAttributeWithSer.java

@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.cfg.ContextAttributes;
 import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
 
 public class TestContextAttributeWithSer extends BaseMapTest
@@ -84,4 +85,26 @@ public void testHierarchic() throws Exception
         // and verify state clearing:
         assertEquals(EXP, w.writeValueAsString(INPUT));
     }
+
+    // [databind#3001]
+    public void testDefaultsViaMapper() throws Exception
+    {
+        final TestPOJO[] INPUT = new TestPOJO[] { new TestPOJO("a"), new TestPOJO("b") };
+        ContextAttributes attrs = ContextAttributes.getEmpty()
+                .withSharedAttribute(KEY, Integer.valueOf(72));
+        ObjectMapper mapper = jsonMapperBuilder()
+                .defaultAttributes(attrs)
+                .build();
+        final String EXP1 = a2q("[{'value':'72:a'},{'value':'73:b'}]");
+        assertEquals(EXP1, mapper.writeValueAsString(INPUT));
+
+        // value should be "reset" as well
+        assertEquals(EXP1, mapper.writeValueAsString(INPUT));
+
+        // and should be overridable on per-call basis too
+        assertEquals(a2q("[{'value':'13:a'},{'value':'14:b'}]"),
+                mapper.writer()
+                    .withAttribute(KEY, Integer.valueOf(13))
+                    .writeValueAsString(INPUT));
+    }
 }