GUI -- Made OOTB formatters and comparators final classes.

Change-Id: I0ea59bf92d97b6d104b7d3770fb5f2e93308bbdc

@@ -23,7 +23,10 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * Formats an application identifier as "(app-id) : (app-name)".
  */
-public class AppIdFormatter extends AbstractCellFormatter {
+public final class AppIdFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private AppIdFormatter() { }
 
     @Override
     protected String nonNullFormat(Object value) {

@@ -23,7 +23,10 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * Formats a connect point as "(element-id)/(port)".
  */
-public class ConnectPointFormatter extends AbstractCellFormatter {
+public final class ConnectPointFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private ConnectPointFormatter() { }
 
     @Override
     protected String nonNullFormat(Object value) {

@@ -25,7 +25,10 @@ import org.onosproject.ui.table.CellComparator;
  * compares the resulting strings. Note that null values are acceptable and
  * are considered "smaller" than any non-null value.
  */
-public class DefaultCellComparator extends AbstractCellComparator {
+public final class DefaultCellComparator extends AbstractCellComparator {
+
+    // non-instantiable
+    private DefaultCellComparator() { }
 
     @Override
     protected int nonNullCompare(Object o1, Object o2) {

@@ -22,7 +22,10 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * A default cell formatter. Uses the object's toString() method.
  */
-public class DefaultCellFormatter extends AbstractCellFormatter {
+public final class DefaultCellFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private DefaultCellFormatter() { }
 
     @Override
     public String nonNullFormat(Object value) {

@@ -23,7 +23,10 @@ import static org.apache.commons.lang.WordUtils.capitalizeFully;
 /**
  * Formats enum types to be readable strings.
  */
-public class EnumFormatter extends AbstractCellFormatter {
+public final class EnumFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private EnumFormatter() { }
 
     @Override
     protected String nonNullFormat(Object value) {

@@ -22,7 +22,10 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * Formats integer values as hex strings with a "0x" prefix.
  */
-public class HexFormatter extends AbstractCellFormatter {
+public final class HexFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private HexFormatter() { }
 
     @Override
     protected String nonNullFormat(Object value) {

@@ -23,7 +23,10 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * Formats a host location as "(device-id)/(port)".
  */
-public class HostLocationFormatter extends AbstractCellFormatter {
+public final class HostLocationFormatter extends AbstractCellFormatter {
+
+    // non-instantiable
+    private HostLocationFormatter() { }
 
     @Override
     protected String nonNullFormat(Object value) {

@@ -24,7 +24,10 @@ import org.onosproject.ui.table.CellComparator;
  * Note that null values are acceptable and are considered "smaller" than
  * any non-null value.
  */
-public class IntComparator extends AbstractCellComparator {
+public final class IntComparator extends AbstractCellComparator {
+
+    // non-instantiable
+    private IntComparator() { }
 
     @Override
     protected int nonNullCompare(Object o1, Object o2) {

@@ -24,7 +24,10 @@ import org.onosproject.ui.table.CellComparator;
  * Note that null values are acceptable and are considered "smaller" than
  * any non-null value.
  */
-public class LongComparator extends AbstractCellComparator {
+public final class LongComparator extends AbstractCellComparator {
+
+    // non-instantiable
+    private LongComparator() { }
 
     @Override
     protected int nonNullCompare(Object o1, Object o2) {

@@ -25,10 +25,13 @@ import org.onosproject.ui.table.CellFormatter;
 /**
  * Formats time values using {@link DateTimeFormatter}.
  */
-public class TimeFormatter extends AbstractCellFormatter {
+public final class TimeFormatter extends AbstractCellFormatter {
 
     private static final DateTimeFormatter DTF = DateTimeFormat.longTime();
 
+    // non-instantiable
+    private TimeFormatter() { }
+
     @Override
     protected String nonNullFormat(Object value) {
         return DTF.print((DateTime) value);