adding isUniqueSubscriptionId method

Issue-ID: CPS-2044
Change-Id: I26b209ead80add7e60b4de9257a9f5c326ddea6f
Signed-off-by: emaclee <lee.anjella.macabuhay@est.tech>

3 files changed, 37 insertions, 2 deletions

diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
index 189fbb53d9..38f3db98de 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceService.java
@@ -40,6 +40,14 @@ public interface CmNotificationSubscriptionPersistenceService {
             final String xpath);
 
     /**
+     * Check if the subscription ID is unique against ongoing subscriptions.
+     *
+     * @param subscriptionId subscription ID
+     * @return true if subscriptionId is not used in active subscriptions, otherwise false
+     */
+    boolean isUniqueSubscriptionId(final String subscriptionId);
+
+    /**
      * Get all ongoing cm notification subscription based on the parameters.
      *
      * @param datastoreType valid datastore type
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
index 63f12ad623..6e4997a4dd 100644
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImpl.java
@@ -36,9 +36,13 @@ import org.springframework.stereotype.Service;
 @RequiredArgsConstructor
 public class CmNotificationSubscriptionPersistenceServiceImpl implements CmNotificationSubscriptionPersistenceService {
 
+    private static final String SUBSCRIPTION_ANCHOR_NAME = "cm-data-subscriptions";
     private static final String IS_ONGOING_CM_SUBSCRIPTION_CPS_PATH_QUERY = """
             /datastores/datastore[@name='%s']/cm-handles/cm-handle[@id='%s']/filters/filter[@xpath='%s']
             """.trim();
+    private static final String SUBSCRIPTION_IDS_CPS_PATH_QUERY = """
+            //filter/subscriptionIds[text()='%s']
+            """.trim();
 
     private final CpsQueryService cpsQueryService;
 
@@ -49,6 +53,13 @@ public class CmNotificationSubscriptionPersistenceServiceImpl implements CmNotif
     }
 
     @Override
+    public boolean isUniqueSubscriptionId(final String subscriptionId) {
+        return cpsQueryService.queryDataNodes(NCMP_DATASPACE_NAME, SUBSCRIPTION_ANCHOR_NAME,
+                SUBSCRIPTION_IDS_CPS_PATH_QUERY.formatted(subscriptionId),
+                FetchDescendantsOption.OMIT_DESCENDANTS).isEmpty();
+    }
+
+    @Override
     public Collection<String> getOngoingCmNotificationSubscriptionIds(final DatastoreType datastoreType,
             final String cmHandleId, final String xpath) {
 
diff --git a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
index e951c31094..eb0e1100ed 100644
--- a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
+++ b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/events/cmsubscription/service/CmNotificationSubscriptionPersistenceServiceImplSpec.groovy
@@ -38,7 +38,7 @@ class CmNotificationSubscriptionPersistenceServiceImplSpec extends Specification
             def cpsPathQuery = "/datastores/datastore[@name='ncmp-datastore:passthrough-running']/cm-handles/cm-handle[@id='ch-1']/filters/filter[@xpath='/cps/path']";
         and: 'datanodes optionally returned'
             1 * mockCpsQueryService.queryDataNodes('NCMP-Admin', 'cm-data-subscriptions',
-                cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >> dataNode
+                    cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >> dataNode
         when: 'we check for an ongoing cm subscription'
             def response = objectUnderTest.isOngoingCmNotificationSubscription(DatastoreType.PASSTHROUGH_RUNNING, 'ch-1', '/cps/path')
         then: 'we get expected response'
@@ -48,4 +48,20 @@ class CmNotificationSubscriptionPersistenceServiceImplSpec extends Specification
             'valid datanodes present' | [new DataNode(xpath: '/cps/path', leaves: ['subscriptionIds': ['sub-1', 'sub-2']])] || true
             'no datanodes present'    | []                                                                                  || false
     }
-}
+
+    def 'Checking uniqueness of incoming subscription ID'() {
+        given: 'a cps path with a subscription ID for querying'
+            def cpsPathQuery = objectUnderTest.SUBSCRIPTION_IDS_CPS_PATH_QUERY.formatted('some-sub')
+        and: 'relevant datanodes are returned'
+            1 * mockCpsQueryService.queryDataNodes('NCMP-Admin', 'cm-data-subscriptions', cpsPathQuery, FetchDescendantsOption.OMIT_DESCENDANTS) >>
+                    dataNodes
+        when: 'a subscription ID is tested for uniqueness'
+            def result = objectUnderTest.isUniqueSubscriptionId('some-sub')
+        then: 'result is as expected'
+            assert result == isValidSubscriptionId
+        where: 'following scenarios are used'
+            scenario               | dataNodes        || isValidSubscriptionId
+            'datanodes present'    | [new DataNode()] || false
+            'no datanodes present' | []               || true
+    }
+}
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