Adding conditionalCreateOnlyProperties to metaschema

src/main/java/software/amazon/cloudformation/resource/ResourceTypeSchema.java

@@ -52,6 +52,7 @@ public class ResourceTypeSchema {
     private final String replacementStrategy;
     private final boolean taggable;
     private final List<JSONPointer> createOnlyProperties = new ArrayList<>();
+    private final List<JSONPointer> conditionalCreateOnlyProperties = new ArrayList<>();
     private final List<JSONPointer> deprecatedProperties = new ArrayList<>();
     private final List<JSONPointer> primaryIdentifier = new ArrayList<>();
     private final List<List<JSONPointer>> additionalIdentifiers = new ArrayList<>();
@@ -96,6 +97,11 @@ public ResourceTypeSchema(Schema schema) {
             : true;
         this.unprocessedProperties.remove("taggable");
 
+        this.unprocessedProperties.computeIfPresent("conditionalCreateOnlyProperties", (k, v) -> {
+            ((ArrayList<?>) v).forEach(p -> this.conditionalCreateOnlyProperties.add(new JSONPointer(p.toString())));
+            return null;
+        });
+
         this.unprocessedProperties.computeIfPresent("createOnlyProperties", (k, v) -> {
             ((ArrayList<?>) v).forEach(p -> this.createOnlyProperties.add(new JSONPointer(p.toString())));
             return null;
@@ -159,6 +165,10 @@ public String getDescription() {
         return schema.getDescription();
     }
 
+    public List<String> getConditionalCreateOnlyPropertiesAsStrings() throws ValidationException {
+        return this.conditionalCreateOnlyProperties.stream().map(JSONPointer::toString).collect(Collectors.toList());
+    }
+
     public List<String> getCreateOnlyPropertiesAsStrings() throws ValidationException {
         return this.createOnlyProperties.stream().map(JSONPointer::toString).collect(Collectors.toList());
     }

src/main/resources/schema/provider.definition.schema.v1.json

@@ -387,6 +387,10 @@
             "description": "A list of JSON pointers to properties (typically sensitive) that are able to be specified by the customer but unable to be returned in a Read request",
             "$ref": "#/definitions/jsonPointerArray"
         },
+        "conditionalCreateOnlyProperties": {
+            "description": "A list of JSON pointers for properties that can only be updated under certain conditions. For example, you can upgrade the engine version of an RDS DBInstance but you cannot downgrade it.  When updating this property for a resource in a CloudFormation stack, the resource will be replaced if it cannot be updated.",
+            "$ref": "#/definitions/jsonPointerArray"
+        },
         "createOnlyProperties": {
             "description": "A list of JSON pointers to properties that are only able to be specified by the customer when creating a resource. Conversely, any property *not* in this list can be applied to an Update request.",
             "$ref": "#/definitions/jsonPointerArray"

src/test/java/software/amazon/cloudformation/resource/ResourceTypeSchemaTest.java

@@ -51,6 +51,16 @@ public void getProperties() {
         assertThat(schema.getUnprocessedProperties()).isEmpty();
     }
 
+    @Test
+    public void getConditionalCreateOnlyProperties() {
+        JSONObject o = loadJSON(TEST_SCHEMA_PATH);
+        final ResourceTypeSchema schema = ResourceTypeSchema.load(o);
+
+        List<String> result = schema.getConditionalCreateOnlyPropertiesAsStrings();
+
+        assertThat(result).containsExactly("/properties/propertyF");
+    }
+
     @Test
     public void getCreateOnlyProperties() {
         JSONObject o = loadJSON(TEST_SCHEMA_PATH);
@@ -171,6 +181,7 @@ public void minimalSchema_hasNoSemantics() {
         assertThat(schema.getTypeName()).isEqualTo("AWS::Test::TestModel");
         assertThat(schema.getUnprocessedProperties()).isEmpty();
         assertThat(schema.getCreateOnlyPropertiesAsStrings()).isEmpty();
+        assertThat(schema.getConditionalCreateOnlyPropertiesAsStrings()).isEmpty();
         assertThat(schema.getDeprecatedPropertiesAsStrings()).isEmpty();
         assertThat(schema.getPrimaryIdentifierAsStrings()).containsExactly("/properties/PropertyA");
         assertThat(schema.getAdditionalIdentifiersAsStrings()).isEmpty();

src/test/resources/test-schema.json

@@ -28,6 +28,9 @@
                     "type": "string"
                 }
             }
+        },
+        "propertyF": {
+            "type": "string"
         }
     },
     "propertyTransform": {
@@ -37,6 +40,9 @@
     "required": [
         "propertyB"
     ],
+    "conditionalCreateOnlyProperties": [
+        "/properties/propertyF"
+    ],
     "createOnlyProperties": [
         "/properties/propertyA",
         "/properties/propertyD"