Fix #2223

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -21,6 +21,7 @@ Project: jackson-databind
 #2204: Add `JsonNode.isEmpty()` as convenience alias
 #2217: Suboptimal memory allocation in `TextNode.getBinaryValue()`
  (reported by Christoph B)
+#2223: Add `missingNode()` method in `JsonNodeFactory`
 
 2.9.8 (15-Dec-2018)
 

src/main/java/com/fasterxml/jackson/databind/node/ContainerNode.java

@@ -52,11 +52,26 @@ protected ContainerNode(JsonNodeFactory nc) {
 
     /*
     /**********************************************************
-    /* JsonNodeCreator implementation, just dispatch to
-    /* the real creator
+    /* JsonNodeCreator implementation, Enumerated/singleton types
     /**********************************************************
      */
 
+    @Override
+    public final BooleanNode booleanNode(boolean v) { return _nodeFactory.booleanNode(v); }
+
+    public JsonNode missingNode() {
+        return _nodeFactory.missingNode();
+    }
+
+    @Override
+    public final NullNode nullNode() { return _nodeFactory.nullNode(); }
+
+    /*
+    /**********************************************************
+    /* JsonNodeCreator implementation, just dispatch to real creator
+    /**********************************************************
+     */
+    
     /**
      * Factory method that constructs and returns an empty {@link ArrayNode}
      * Construction is done using registered {@link JsonNodeFactory}.
@@ -79,12 +94,6 @@ protected ContainerNode(JsonNodeFactory nc) {
     @Override
     public final ObjectNode objectNode() { return _nodeFactory.objectNode(); }
 
-    @Override
-    public final NullNode nullNode() { return _nodeFactory.nullNode(); }
-
-    @Override
-    public final BooleanNode booleanNode(boolean v) { return _nodeFactory.booleanNode(v); }
-
     @Override
     public final NumericNode numberNode(byte v) { return _nodeFactory.numberNode(v); }
     @Override

src/main/java/com/fasterxml/jackson/databind/node/JsonNodeCreator.java

@@ -19,6 +19,9 @@ public interface JsonNodeCreator
     public ValueNode booleanNode(boolean v);
     public ValueNode nullNode();
 
+// Not yet in 2.10, will be added in 3.0    
+//    public JsonNode missingNode();
+    
     // Numeric types
 
     public ValueNode numberNode(byte v);

src/main/java/com/fasterxml/jackson/databind/node/JsonNodeFactory.java

@@ -3,6 +3,7 @@
 import java.math.BigDecimal;
 import java.math.BigInteger;
 
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.util.RawValue;
 
 /**
@@ -108,6 +109,10 @@ public BooleanNode booleanNode(boolean v) {
     @Override
     public NullNode nullNode() { return NullNode.getInstance(); }
 
+    public JsonNode missingNode() {
+        return MissingNode.getInstance();
+    }
+    
     /*
     /**********************************************************
     /* Factory methods for numeric values

src/test/java/com/fasterxml/jackson/databind/node/JsonNodeFactoryTest.java

@@ -33,5 +33,7 @@ public void testSimpleCreation()
         assertTrue(f.numberNode((BigDecimal) null).isNull());
 
         assertTrue(f.numberNode((BigInteger) null).isNull());
+
+        assertTrue(f.missingNode().isMissingNode());
     }
 }