From 91be9b2295ffc5e311cc12f9986e6230a355c803 Mon Sep 17 00:00:00 2001
From: Robert Varga <robert.varga@pantheon.tech>
Date: Thu, 11 Aug 2022 01:23:51 +0200
Subject: [PATCH] Add YangFeatureProvider

YangFeatureProvider is a counterpart to YangModuleInfoProvider,
providing the runtime with the ability to introspect what features
should be supported in an EffectiveModelContext.

JIRA: MDSAL-767
Change-Id: I6d08772c96eead79b4c88ae9ac27c57901dc70a8
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
---
 binding/mdsal-binding-test-model/pom.xml      |  4 +++
 .../test/model/util/Mdsal767Support.java      | 30 ++++++++++++++++
 .../src/main/yang/mdsal767.yang               | 16 +++++++++
 .../yang/binding/YangFeatureProvider.java     | 34 +++++++++++++++++++
 4 files changed, 84 insertions(+)
 create mode 100644 binding/mdsal-binding-test-model/src/main/java/org/opendaylight/mdsal/binding/test/model/util/Mdsal767Support.java
 create mode 100644 binding/mdsal-binding-test-model/src/main/yang/mdsal767.yang
 create mode 100644 binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/YangFeatureProvider.java

diff --git a/binding/mdsal-binding-test-model/pom.xml b/binding/mdsal-binding-test-model/pom.xml
index 2b2f33dc44..d3f019e3a6 100644
--- a/binding/mdsal-binding-test-model/pom.xml
+++ b/binding/mdsal-binding-test-model/pom.xml
@@ -43,5 +43,9 @@
             <groupId>org.opendaylight.mdsal.model</groupId>
             <artifactId>yang-ext</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.kohsuke.metainf-services</groupId>
+            <artifactId>metainf-services</artifactId>
+        </dependency>
     </dependencies>
 </project>
diff --git a/binding/mdsal-binding-test-model/src/main/java/org/opendaylight/mdsal/binding/test/model/util/Mdsal767Support.java b/binding/mdsal-binding-test-model/src/main/java/org/opendaylight/mdsal/binding/test/model/util/Mdsal767Support.java
new file mode 100644
index 0000000000..45188aa97d
--- /dev/null
+++ b/binding/mdsal-binding-test-model/src/main/java/org/opendaylight/mdsal/binding/test/model/util/Mdsal767Support.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.mdsal.binding.test.model.util;
+
+import java.util.Set;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.kohsuke.MetaInfServices;
+import org.opendaylight.yang.gen.v1.mdsal767.norev.Mdsal767Data;
+import org.opendaylight.yang.gen.v1.mdsal767.norev.One$F;
+import org.opendaylight.yangtools.yang.binding.YangFeature;
+import org.opendaylight.yangtools.yang.binding.YangFeatureProvider;
+
+@MetaInfServices
+@NonNullByDefault
+public final class Mdsal767Support implements YangFeatureProvider<Mdsal767Data> {
+    @Override
+    public Class<Mdsal767Data> boundModule() {
+        return Mdsal767Data.class;
+    }
+
+    @Override
+    public Set<? extends YangFeature<?, Mdsal767Data>> supportedFeatures() {
+        return Set.of(One$F.VALUE);
+    }
+}
diff --git a/binding/mdsal-binding-test-model/src/main/yang/mdsal767.yang b/binding/mdsal-binding-test-model/src/main/yang/mdsal767.yang
new file mode 100644
index 0000000000..980c7156b5
--- /dev/null
+++ b/binding/mdsal-binding-test-model/src/main/yang/mdsal767.yang
@@ -0,0 +1,16 @@
+module mdsal767 {
+  namespace mdsal767;
+  prefix mdsal767;
+
+  feature one;
+
+  feature two;
+
+  container one {
+    if-feature one;
+  }
+
+  container two {
+    if-feature two;
+  }
+}
diff --git a/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/YangFeatureProvider.java b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/YangFeatureProvider.java
new file mode 100644
index 0000000000..90e882f2a0
--- /dev/null
+++ b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/YangFeatureProvider.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.binding;
+
+import java.util.ServiceLoader;
+import java.util.Set;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+
+/**
+ * Run-time feature discovery service. Implementations of this interface are required to be registered with the
+ * {@link ServiceLoader} framework.
+ */
+@NonNullByDefault
+public interface YangFeatureProvider<R extends DataRoot> {
+    /**
+     * Return the module this provider recognizes. It is implied that any feature defined in this module and not
+     * advertized by any provider is unavailable.
+     *
+     * @return {@link DataRoot} class this provider binds to
+     */
+    Class<R> boundModule();
+
+    /**
+     * Return the set of supported features.
+     *
+     * @return Supported features.
+     */
+    Set<? extends YangFeature<?, R>> supportedFeatures();
+}
-- 
2.36.6