new sonar issues in drools-applications

Don't return null lists from AAI.
Transient TargetLock.
Extract aai.url, et. al., constants.
Don't allocate extra unneeded variable.
Re-order fields in xacml attributes.
Extract "vserver" constant from simulator.
Replace thread sleep with join.

Change-Id: Iee1bd182862632af1f131cca5db5b526f5865b9f
Issue-ID: POLICY-1129
Signed-off-by: Jim Hahn <jrh3@att.com>

2 files changed, 12 insertions, 24 deletions

diff --git a/controlloop/common/model-impl/aai/src/main/java/org/onap/policy/aai/AaiNqResponseWrapper.java b/controlloop/common/model-impl/aai/src/main/java/org/onap/policy/aai/AaiNqResponseWrapper.java
index be84fdfa8..eb4271b5c 100644
--- a/controlloop/common/model-impl/aai/src/main/java/org/onap/policy/aai/AaiNqResponseWrapper.java
+++ b/controlloop/common/model-impl/aai/src/main/java/org/onap/policy/aai/AaiNqResponseWrapper.java
@@ -22,6 +22,7 @@ package org.onap.policy.aai;
 
 import java.io.Serializable;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
 import java.util.regex.Matcher;
@@ -68,8 +69,7 @@ public class AaiNqResponseWrapper implements Serializable {
      * @return the number of VF modules, or {@code 0} if there are none
      */
     public int countVfModules() {
-        List<AaiNqInventoryResponseItem> lst = getVfModuleItems(false);
-        return (lst == null ? 0 : lst.size());
+        return getVfModuleItems(false).size();
     }
 
     /**
@@ -80,11 +80,6 @@ public class AaiNqResponseWrapper implements Serializable {
      *         which to model it)
      */
     public String genVfModuleName() {
-        List<AaiNqInventoryResponseItem> lst = getVfModuleItems(false);
-        if (lst == null) {
-            return null;
-        }
-
         /*
          * Loop through the VF modules, extracting the name prefix and the largest number
          * suffix
@@ -92,7 +87,7 @@ public class AaiNqResponseWrapper implements Serializable {
         String prefix = null;
         int maxSuffix = -1;
 
-        for (AaiNqInventoryResponseItem item : lst) {
+        for (AaiNqInventoryResponseItem item : getVfModuleItems(false)) {
             String name = item.getVfModule().getVfModuleName();
             Matcher matcher = VF_MODULE_NAME_PAT.matcher(name);
             if (matcher.matches()) {
@@ -116,7 +111,7 @@ public class AaiNqResponseWrapper implements Serializable {
      *
      * @param wantBaseModule {@code true} if the the base VF module(s) is desired,
      *        {@code false} otherwise
-     * @return the list of VF module items, or {@code null} if there are no VF modules
+     * @return the list of VF module items
      */
     public List<AaiNqInventoryResponseItem> getVfModuleItems(boolean wantBaseModule) {
         // get the list of items
@@ -127,18 +122,18 @@ public class AaiNqResponseWrapper implements Serializable {
 
         } catch (NullPointerException | IndexOutOfBoundsException e) {
             logger.debug("no VF modules in AAI response", e);
-            return null;
+            return Collections.emptyList();
         }
 
         if (itemList == null) {
-            return null;
+            return Collections.emptyList();
         }
 
         /*
          * Walk the items looking for VF modules, allocating the list only when an item is
          * found.
          */
-        List<AaiNqInventoryResponseItem> vfModuleItems = null;
+        List<AaiNqInventoryResponseItem> vfModuleItems = new ArrayList<>(itemList.size());;
 
         for (AaiNqInventoryResponseItem inventoryResponseItem : itemList) {
             AaiNqVfModule vfmod = inventoryResponseItem.getVfModule();
@@ -146,10 +141,6 @@ public class AaiNqResponseWrapper implements Serializable {
                 continue;
             }
 
-            if (vfModuleItems == null) {
-                vfModuleItems = new ArrayList<>(itemList.size());
-            }
-
             if (vfmod.getIsBaseVfModule() == wantBaseModule
                             && (wantBaseModule || VF_MODULE_NAME_PAT.matcher(vfmod.getVfModuleName()).matches())) {
                 vfModuleItems.add(inventoryResponseItem);
diff --git a/controlloop/common/model-impl/aai/src/test/java/org/onap/policy/aai/AaiNqResponseWrapperTest.java b/controlloop/common/model-impl/aai/src/test/java/org/onap/policy/aai/AaiNqResponseWrapperTest.java
index 9acaa117c..d1e8e964e 100644
--- a/controlloop/common/model-impl/aai/src/test/java/org/onap/policy/aai/AaiNqResponseWrapperTest.java
+++ b/controlloop/common/model-impl/aai/src/test/java/org/onap/policy/aai/AaiNqResponseWrapperTest.java
@@ -22,7 +22,7 @@ package org.onap.policy.aai;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -207,41 +207,38 @@ public class AaiNqResponseWrapperTest {
 
         // null item
         resp = new AaiNqResponseWrapper();
-        assertNull(resp.getVfModuleItems(true));
+        assertTrue(resp.getVfModuleItems(true).isEmpty());
 
         // missing item
         resp = new AaiNqResponseWrapper();
         resp.setAaiNqResponse(new AaiNqResponse());
-        assertNull(resp.getVfModuleItems(false));
+        assertTrue(resp.getVfModuleItems(false).isEmpty());
 
         // null item list
         resp.setAaiNqResponse(load("AaiNqResponseWrapper-NoItems.json"));
         resp.getAaiNqResponse().getInventoryResponseItems().get(0).getItems().getInventoryResponseItems().get(0)
                         .getItems().setInventoryResponseItems(null);
-        assertNull(resp.getVfModuleItems(false));
+        assertTrue(resp.getVfModuleItems(false).isEmpty());
         
         // no modules
         resp.setAaiNqResponse(load("AaiNqResponseWrapper-NoModules.json"));
-        assertNull(resp.getVfModuleItems(false));
+        assertTrue(resp.getVfModuleItems(false).isEmpty());
         
         // no names
         resp.setAaiNqResponse(load("AaiNqResponseWrapper-NoNames.json"));
         List<AaiNqInventoryResponseItem> lst;
         lst = resp.getVfModuleItems(false);
-        assertNotNull(lst);
         assertEquals(0, lst.size());
 
         // base VF modules
         resp.setAaiNqResponse(load("AaiNqResponseWrapper-Vserver.json"));
         lst = resp.getVfModuleItems(true);
-        assertNotNull(lst);
         assertEquals(1, lst.size());
         assertEquals("Vfmodule_vLBMS-0809-1", lst.get(0).getVfModule().getVfModuleName());
         
         // non base VF modules
         resp.setAaiNqResponse(load("AaiNqResponseWrapper-Vserver.json"));
         lst = resp.getVfModuleItems(false);
-        assertNotNull(lst);
         assertEquals(3, lst.size());
         int index;
         index = 0;