implement property and optionalProperty(String, JsonFormatVisitable, JavaType) methods

protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/schemagen/AnnotationBasedTagGenerator.java

@@ -13,4 +13,9 @@ public int nextTag(BeanProperty writer) {
         throw new IllegalStateException("No index metadata found for " + writer.getFullName()
                 + " (usually annotated with @JsonProperty.index): either annotate all properties of type " + writer.getWrapperName().getSimpleName() + " with indexes or none at all");
     }
+
+    @Override
+    public int nextTag() {
+        throw new IllegalStateException("Index metadata not found, (usually annotated with @JsonProperty.index): either annotate all properties with indexes or none at all");
+    }
 }

protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/schemagen/MessageElementVisitor.java

@@ -50,8 +50,8 @@ public void property(BeanProperty writer) throws JsonMappingException {
     }
 
     @Override
-    public void property(String name, JsonFormatVisitable handler, JavaType propertyTypeHint) {
-        throw new UnsupportedOperationException();
+    public void property(String name, JsonFormatVisitable handler, JavaType propertyTypeHint) throws JsonMappingException {
+       _builder.addField(buildFieldElement(name, propertyTypeHint, Label.REQUIRED));
     }
 
     @Override
@@ -60,8 +60,8 @@ public void optionalProperty(BeanProperty writer) throws JsonMappingException {
     }
 
     @Override
-    public void optionalProperty(String name, JsonFormatVisitable handler, JavaType propertyTypeHint) {
-        throw new UnsupportedOperationException();
+    public void optionalProperty(String name, JsonFormatVisitable handler, JavaType propertyTypeHint) throws JsonMappingException {
+        _builder.addField(buildFieldElement(name, propertyTypeHint, Label.OPTIONAL));
     }
 
     protected FieldElement buildFieldElement(BeanProperty writer, Label label) throws JsonMappingException
@@ -88,14 +88,41 @@ protected FieldElement buildFieldElement(BeanProperty writer, Label label) throw
         return fBuilder.build();
     }
 
+    protected FieldElement buildFieldElement(String name, JavaType type, Label label) throws JsonMappingException
+    {
+        FieldElement.Builder fBuilder = FieldElement.builder();
+
+        fBuilder.name(name);
+        fBuilder.tag(nextTag());
+
+        if (type.isArrayType() || type.isCollectionLikeType()) {
+            if (ProtobufSchemaHelper.isBinaryType(type)) {
+                fBuilder.label(label);
+                fBuilder.type(ScalarType.BYTES);
+            } else {
+                fBuilder.label(Label.REPEATED);
+                fBuilder.type(getDataType(type.getContentType()));
+            }
+        } else {
+            fBuilder.label(label);
+            fBuilder.type(getDataType(type));
+        }
+        return fBuilder.build();
+    }
+
+    protected int nextTag() {
+        getTagGenerator(null);
+        return _tagGenerator.nextTag();
+    }
+
     protected int nextTag(BeanProperty writer) {
         getTagGenerator(writer);
         return _tagGenerator.nextTag(writer);
     }
 
     protected void getTagGenerator(BeanProperty writer) {
         if (_tagGenerator == null) {
-            if (ProtobufSchemaHelper.hasIndex(writer)) {
+            if (writer != null && ProtobufSchemaHelper.hasIndex(writer)) {
                 _tagGenerator = new AnnotationBasedTagGenerator();
             } else {
                 _tagGenerator = new DefaultTagGenerator();

protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/schemagen/TagGenerator.java

@@ -4,4 +4,6 @@
 
 interface TagGenerator {
 	int nextTag(BeanProperty writer);
+
+	int nextTag();
 }