Disallow empty subgroup list in group request

Change-Id: I8a00caf1b22363fe3ab90bdf57244af687a2cb6d
Issue-ID: POLICY-1542
Signed-off-by: Jim Hahn <jrh3@att.com>

3 files changed, 26 insertions, 8 deletions

diff --git a/models-pdp/src/main/java/org/onap/policy/models/pdp/concepts/PdpGroup.java b/models-pdp/src/main/java/org/onap/policy/models/pdp/concepts/PdpGroup.java
index 49dfd6fbb..4cb0ac54e 100644
--- a/models-pdp/src/main/java/org/onap/policy/models/pdp/concepts/PdpGroup.java
+++ b/models-pdp/src/main/java/org/onap/policy/models/pdp/concepts/PdpGroup.java
@@ -89,6 +89,11 @@ public class PdpGroup implements PfNameVersion, Comparable<PdpGroup> {
         result.validateNotNull("name", name);
         result.validateNotNullList("pdpSubgroups", pdpSubgroups, PdpSubGroup::validatePapRest);
 
+        if (pdpSubgroups != null && pdpSubgroups.isEmpty()) {
+            result.addResult(new ObjectValidationResult("pdpSubgroups", pdpSubgroups, ValidationStatus.INVALID,
+                            "is empty"));
+        }
+
         checkDuplicateSubgroups(result);
 
         return result;
diff --git a/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupTest.java b/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupTest.java
index 0df2d34d9..a717dc2d8 100644
--- a/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupTest.java
+++ b/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupTest.java
@@ -56,7 +56,7 @@ public class PdpGroupTest {
 
         // verify with null values
         assertEquals("PdpGroup(name=null, description=null, pdpGroupState=null, " + "properties=null, pdpSubgroups=[])",
-                new PdpGroup(orig).toString());
+                        new PdpGroup(orig).toString());
 
         // verify with all values
         orig.setDescription("my-descript");
@@ -77,11 +77,11 @@ public class PdpGroupTest {
         orig.setProperties(props);
 
         assertEquals("PdpGroup(name=my-name, description=my-description, "
-                + "pdpGroupState=SAFE, properties={key-A=value-A, key-B=value-B}, "
-                + "pdpSubgroups=[PdpSubGroup(pdpType=null, supportedPolicyTypes=[], policies=[], "
-                + "currentInstanceCount=10, desiredInstanceCount=0, properties=null, pdpInstances=[]), "
-                + "PdpSubGroup(pdpType=null, supportedPolicyTypes=[], policies=[], currentInstanceCount=11, "
-                + "desiredInstanceCount=0, properties=null, pdpInstances=[])])", new PdpGroup(orig).toString());
+                        + "pdpGroupState=SAFE, properties={key-A=value-A, key-B=value-B}, "
+                        + "pdpSubgroups=[PdpSubGroup(pdpType=null, supportedPolicyTypes=[], policies=[], "
+                        + "currentInstanceCount=10, desiredInstanceCount=0, properties=null, pdpInstances=[]), "
+                        + "PdpSubGroup(pdpType=null, supportedPolicyTypes=[], policies=[], currentInstanceCount=11, "
+                        + "desiredInstanceCount=0, properties=null, pdpInstances=[])])", new PdpGroup(orig).toString());
     }
 
     @Test
@@ -154,6 +154,11 @@ public class PdpGroupTest {
         group2.setPdpSubgroups(null);
         assertInvalid(group2);
 
+        // empty subgroup list
+        group2 = new PdpGroup(group);
+        group2.setPdpSubgroups(Collections.emptyList());
+        assertInvalid(group2);
+
         // null subgroup
         group2 = new PdpGroup(group);
         group2.setPdpSubgroups(Arrays.asList(subgroup1, null));
diff --git a/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupsTest.java b/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupsTest.java
index e0fafc18d..bd98f18c3 100644
--- a/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupsTest.java
+++ b/models-pdp/src/test/java/org/onap/policy/models/pdp/concepts/PdpGroupsTest.java
@@ -34,6 +34,7 @@ import java.util.List;
 import java.util.Map;
 import org.junit.Test;
 import org.onap.policy.common.parameters.ValidationResult;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
 
 public class PdpGroupsTest {
 
@@ -41,11 +42,18 @@ public class PdpGroupsTest {
     public void testValidatePapRest_toMapList() {
         PdpGroup group1 = new PdpGroup();
         group1.setName("group-1");
-        group1.setPdpSubgroups(Collections.emptyList());
+
+        PdpSubGroup subgrp = new PdpSubGroup();
+        subgrp.setDesiredInstanceCount(1);
+        subgrp.setPdpType("pdp-type");
+        subgrp.setSupportedPolicyTypes(Arrays.asList(new ToscaPolicyTypeIdentifier("policy-type", "9.8.7")));
+        subgrp.setPolicies(Collections.emptyList());
+
+        group1.setPdpSubgroups(Arrays.asList(subgrp));
 
         PdpGroup group2 = new PdpGroup();
         group2.setName("group-2");
-        group2.setPdpSubgroups(Collections.emptyList());
+        group2.setPdpSubgroups(Arrays.asList(subgrp));
 
         PdpGroups groups = new PdpGroups();
         groups.setGroups(Arrays.asList(group1, group2));