Hactoberfest2023 : Multiple Directive Coexist validation

Author: vkarthikeya

src/main/java/com/intuit/graphql/orchestrator/authorization/ValidateMultipleDirectivesCoexist.java

@@ -0,0 +1,32 @@
+package com.intuit.graphql.orchestrator.authorization;
+
+import com.intuit.graphql.graphQL.Directive;
+import com.intuit.graphql.orchestrator.stitching.InvalidDirectivePairingException;
+import org.apache.commons.collections4.CollectionUtils;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ValidateMultipleDirectivesCoexist {
+
+        public void validate(List<Directive> directives) {
+            List<String> directiveNames = directives.stream()
+                    .map(d -> d.getDefinition().getName())
+                    .collect(Collectors.toList());
+
+            if (CollectionUtils.containsAll(directiveNames, Arrays.asList("resolver", "external"))) {
+                throw new InvalidDirectivePairingException("resolver", "external");
+            }
+
+            if (CollectionUtils.containsAll(directiveNames, Arrays.asList("resolver", "provides"))) {
+                throw new InvalidDirectivePairingException("resolver", "provides");
+            }
+
+            if (CollectionUtils.containsAll(directiveNames, Arrays.asList("resolver", "requires"))) {
+                throw new InvalidDirectivePairingException("resolver", "requires");
+            }
+
+        }
+
+}

…ve/InvalidDirectivePairingException.java …ng/InvalidDirectivePairingException.javasrc/main/java/com/intuit/graphql/orchestrator/resolverdirective/InvalidDirectivePairingException.java renamed to src/main/java/com/intuit/graphql/orchestrator/stitching/InvalidDirectivePairingException.java src/main/java/com/intuit/graphql/orchestrator/resolverdirective/InvalidDirectivePairingException.java renamed to src/main/java/com/intuit/graphql/orchestrator/stitching/InvalidDirectivePairingException.java

@@ -1,6 +1,7 @@
-package com.intuit.graphql.orchestrator.resolverdirective;
+package com.intuit.graphql.orchestrator.stitching;
 
-public class InvalidDirectivePairingException extends ResolverDirectiveException {
+
+public class InvalidDirectivePairingException extends StitchingException {
 
   private static final String ERR_MSG = "Field %s in container type %s with resolver directive not allowed "
       + "to have argument definitions.";