Fix Sonar issue:

Strings literals should be placed on the left side when checking for
equality

Change-Id: I4537e08936731ace55aeecb3ad941269ec1eb191
diff --git a/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java b/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
index 51bb9db..c9d8f08 100644
--- a/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
@@ -70,7 +70,7 @@
     // Installs the application from input of the specified URL
     private boolean installApp(ApplicationAdminService service, String url) {
         try {
-            if (url.equals("-")) {
+            if ("-".equals(url)) {
                 service.install(System.in);
             } else {
                 service.install(new URL(url).openStream());
diff --git a/cli/src/main/java/org/onosproject/cli/app/ApplicationNameCompleter.java b/cli/src/main/java/org/onosproject/cli/app/ApplicationNameCompleter.java
index be921cc..f8d86f1 100644
--- a/cli/src/main/java/org/onosproject/cli/app/ApplicationNameCompleter.java
+++ b/cli/src/main/java/org/onosproject/cli/app/ApplicationNameCompleter.java
@@ -63,9 +63,9 @@
 //            if (previousApps.contains(app.id().name())) {
 //                continue;
 //            }
-            if (cmd.equals("uninstall") ||
-                    (cmd.equals("activate") && state == INSTALLED) ||
-                    (cmd.equals("deactivate") && state == ACTIVE)) {
+            if ("uninstall".equals(cmd) ||
+                    ("activate".equals(cmd) && state == INSTALLED) ||
+                    ("deactivate".equals(cmd) && state == ACTIVE)) {
                 strings.add(app.id().name());
             }
         }
diff --git a/cli/src/main/java/org/onosproject/cli/net/DevicePortStateCommand.java b/cli/src/main/java/org/onosproject/cli/net/DevicePortStateCommand.java
index 798166e..c49f23e 100644
--- a/cli/src/main/java/org/onosproject/cli/net/DevicePortStateCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/DevicePortStateCommand.java
@@ -59,9 +59,9 @@
             print(" %s", "Port does not exist");
             return;
         }
-        if (portState.equals("enable")) {
+        if ("enable".equals(portState)) {
             deviceAdminService.changePortState(dev.id(), pnum, true);
-        } else if (portState.equals("disable")) {
+        } else if ("disable".equals(portState)) {
             deviceAdminService.changePortState(dev.id(), pnum, false);
         } else {
             print(" %s", "State must be enable or disable");
diff --git a/cli/src/main/java/org/onosproject/cli/net/DpisListCommand.java b/cli/src/main/java/org/onosproject/cli/net/DpisListCommand.java
index 85c2dda..0533652 100644
--- a/cli/src/main/java/org/onosproject/cli/net/DpisListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/DpisListCommand.java
@@ -214,7 +214,7 @@
 
     private void printDpiStatisticsJson(int number, DpiStatistics ds) {
         String index = number < 0 ? String.format("  -  ") : String.format("%5d", number);
-        if (ds.receivedTime().equals("")) {
+        if ("".equals(ds.receivedTime())) {
             print("ReceivedTime is null, No valid DPI Statistics!");
             return;
         }
@@ -233,7 +233,7 @@
             return;
         }
 
-        if (ds.receivedTime().equals("")) {
+        if ("".equals(ds.receivedTime())) {
             print("ReceivedTime is null, No valid DPI Statistics!");
             return;
         }
@@ -359,7 +359,7 @@
         sb.append(String.format(" [%s pkts/", fsi.packets()));
         sb.append(String.format("%s bytes]", fsi.bytes()));
         String serverHostName = fsi.hostServerName();
-        if (serverHostName != null && !serverHostName.equals("")) {
+        if (serverHostName != null && !"".equals(serverHostName)) {
             sb.append(String.format("[Host: %s]", serverHostName));
         }
 
diff --git a/cli/src/main/java/org/onosproject/cli/net/FlowsListCommand.java b/cli/src/main/java/org/onosproject/cli/net/FlowsListCommand.java
index 7cbd586..c417ddc 100644
--- a/cli/src/main/java/org/onosproject/cli/net/FlowsListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/FlowsListCommand.java
@@ -163,7 +163,7 @@
             try {
                 response = br.readLine();
                 response = response.trim().replace("\n", "");
-                if (response.equals("y")) {
+                if ("y".equals(response)) {
                     flowService.removeFlowRules(flow);
                 }
             } catch (IOException e) {
diff --git a/cli/src/main/java/org/onosproject/cli/net/GetFlowStatisticsCommand.java b/cli/src/main/java/org/onosproject/cli/net/GetFlowStatisticsCommand.java
index 6d9ff67..bb41497 100644
--- a/cli/src/main/java/org/onosproject/cli/net/GetFlowStatisticsCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/GetFlowStatisticsCommand.java
@@ -252,15 +252,15 @@
     private FlowEntry.FlowLiveType getFlowLiveType(String liveType) {
         String liveTypeUC = liveType.toUpperCase();
 
-        if (liveTypeUC.equals("IMMEDIATE")) {
+        if ("IMMEDIATE".equals(liveTypeUC)) {
             return FlowEntry.FlowLiveType.IMMEDIATE;
-        } else if (liveTypeUC.equals("SHORT")) {
+        } else if ("SHORT".equals(liveTypeUC)) {
             return FlowEntry.FlowLiveType.SHORT;
-        } else if (liveTypeUC.equals("MID")) {
+        } else if ("MID".equals(liveTypeUC)) {
             return FlowEntry.FlowLiveType.MID;
-        } else if (liveTypeUC.equals("LONG")) {
+        } else if ("LONG".equals(liveTypeUC)) {
             return FlowEntry.FlowLiveType.LONG;
-        } else if (liveTypeUC.equals("UNKNOWN")) {
+        } else if ("UNKNOWN".equals(liveTypeUC)) {
             return FlowEntry.FlowLiveType.UNKNOWN;
         } else {
             return null; // flow live type error
@@ -276,19 +276,19 @@
     private Instruction.Type getInstructionType(String instType) {
         String instTypeUC = instType.toUpperCase();
 
-        if (instTypeUC.equals("OUTPUT")) {
+        if ("OUTPUT".equals(instTypeUC)) {
             return Instruction.Type.OUTPUT;
-        } else if (instTypeUC.equals("GROUP")) {
+        } else if ("GROUP".equals(instTypeUC)) {
             return Instruction.Type.GROUP;
-        } else if (instTypeUC.equals("L0MODIFICATION")) {
+        } else if ("L0MODIFICATION".equals(instTypeUC)) {
             return Instruction.Type.L0MODIFICATION;
-        } else if (instTypeUC.equals("L2MODIFICATION")) {
+        } else if ("L2MODIFICATION".equals(instTypeUC)) {
             return Instruction.Type.L2MODIFICATION;
-        } else if (instTypeUC.equals("TABLE")) {
+        } else if ("TABLE".equals(instTypeUC)) {
             return Instruction.Type.TABLE;
-        } else if (instTypeUC.equals("L3MODIFICATION")) {
+        } else if ("L3MODIFICATION".equals(instTypeUC)) {
             return Instruction.Type.L3MODIFICATION;
-        } else if (instTypeUC.equals("METADATA")) {
+        } else if ("METADATA".equals(instTypeUC)) {
             return Instruction.Type.METADATA;
         } else {
              return null; // instruction type error
diff --git a/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java b/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
index 8c9cfcf..610a6bf 100644
--- a/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/GroupsListCommand.java
@@ -104,7 +104,7 @@
                 new TreeMap<>(Comparators.ELEMENT_COMPARATOR);
         List<Group> groups;
         GroupState s = null;
-        if (state != null && !state.equals("any")) {
+        if (!"any".equals(state)) {
             s = GroupState.valueOf(state.toUpperCase());
         }
         Iterable<Device> devices = deviceService.getDevices();
diff --git a/cli/src/main/java/org/onosproject/cli/net/IntentRemoveCommand.java b/cli/src/main/java/org/onosproject/cli/net/IntentRemoveCommand.java
index 741de20..7e28afb 100644
--- a/cli/src/main/java/org/onosproject/cli/net/IntentRemoveCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/IntentRemoveCommand.java
@@ -106,7 +106,7 @@
             try {
                 response = br.readLine();
                 response = response.trim().replace("\n", "");
-                if (response.equals("y")) {
+                if ("y".equals(response)) {
                     this.purgeIntents(ImmutableList.of(intent));
                 }
             } catch (IOException e) {
diff --git a/cli/src/main/java/org/onosproject/cli/net/McastDeleteCommand.java b/cli/src/main/java/org/onosproject/cli/net/McastDeleteCommand.java
index aa026ed..f2658c8 100644
--- a/cli/src/main/java/org/onosproject/cli/net/McastDeleteCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/McastDeleteCommand.java
@@ -50,7 +50,7 @@
     protected void execute() {
         MulticastRouteService mcastRouteManager = get(MulticastRouteService.class);
 
-        if (sAddr.equals("*") && gAddr.equals("*")) {
+        if ("*".equals(sAddr) && "*".equals(gAddr)) {
             // Clear all routes
             mcastRouteManager.getRoutes().forEach(mcastRouteManager::remove);
             return;
diff --git a/cli/src/main/java/org/onosproject/cli/net/RegionUpdateCommand.java b/cli/src/main/java/org/onosproject/cli/net/RegionUpdateCommand.java
index 7ea9ec6..f0887fa 100644
--- a/cli/src/main/java/org/onosproject/cli/net/RegionUpdateCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/RegionUpdateCommand.java
@@ -78,7 +78,7 @@
         List<Set<NodeId>> masters = Lists.newArrayList();
         Set<NodeId> nodeIds = Sets.newHashSet();
         for (String masterArg : masterArgs) {
-            if (masterArg.equals("/")) {
+            if ("/".equals(masterArg)) {
                 masters.add(nodeIds);
                 nodeIds = Sets.newHashSet();
             } else {
diff --git a/cli/src/main/java/org/onosproject/cli/security/ReviewCommand.java b/cli/src/main/java/org/onosproject/cli/security/ReviewCommand.java
index 9ce99be..0ebd283 100644
--- a/cli/src/main/java/org/onosproject/cli/security/ReviewCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/security/ReviewCommand.java
@@ -62,7 +62,7 @@
         if (accept == null) {
             smService.review(appId);
             printPolicy(smService, app);
-        } else if (accept.trim().equals("accept")) {
+        } else if ("accept".equals(accept.trim())) {
             smService.acceptPolicy(appId);
             printPolicy(smService, app);
         } else {