Move resolver service to resolver module
diff --git a/src/main/java/org/apache/sling/feature/resolver/Resolver.java b/src/main/java/org/apache/sling/feature/resolver/Resolver.java
new file mode 100644
index 0000000..f18626e
--- /dev/null
+++ b/src/main/java/org/apache/sling/feature/resolver/Resolver.java
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.feature.resolver;
+
+import org.apache.sling.feature.Feature;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Resolver {
+
+    public List<Feature> resolve(final ResolverContext ctx) {
+        final List<Feature> result = new ArrayList<>(ctx.getRequiredFeatures());
+
+        return result;
+    }
+}
+
diff --git a/src/main/java/org/apache/sling/feature/resolver/ResolverContext.java b/src/main/java/org/apache/sling/feature/resolver/ResolverContext.java
new file mode 100644
index 0000000..3490525
--- /dev/null
+++ b/src/main/java/org/apache/sling/feature/resolver/ResolverContext.java
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.feature.resolver;
+
+import org.apache.sling.feature.Feature;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ResolverContext {
+
+    private final List<Feature> requiredFeatures = new ArrayList<>();
+
+    private final List<Feature> optionalFeatures = new ArrayList<>();
+
+    public List<Feature> getRequiredFeatures() {
+        return requiredFeatures;
+    }
+
+    public List<Feature> getOptionalFeatures() {
+        return optionalFeatures;
+    }
+
+    public void addRequiredFeatures(final List<Feature> features) {
+        this.requiredFeatures.addAll(features);
+    }
+
+    public void addOptionalFeatures(final List<Feature> features) {
+        this.optionalFeatures.addAll(features);
+    }
+}
+