GUI -- added getAsString() to TableModel.Row.
- Moved cell-related classes to new package.
- Created base classes for cell comparator and formatter.
- Created IntComparator and HexFormatter.

Change-Id: I3861bf3e0ca738a2d6eab9c70174db53f22960f8
diff --git a/core/api/src/test/java/org/onosproject/ui/table/cell/DefaultCellFormatterTest.java b/core/api/src/test/java/org/onosproject/ui/table/cell/DefaultCellFormatterTest.java
new file mode 100644
index 0000000..8934f48
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/ui/table/cell/DefaultCellFormatterTest.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onosproject.ui.table.cell;
+
+import org.junit.Test;
+import org.onosproject.ui.table.CellFormatter;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Unit tests for {@link DefaultCellFormatter}.
+ */
+public class DefaultCellFormatterTest {
+
+    private static final String UNEX = "Unexpected result";
+    private static final String SOME_STRING = "SoMeStRiNg";
+
+    private static class TestClass {
+        @Override
+        public String toString() {
+            return SOME_STRING;
+        }
+    }
+
+    private CellFormatter fmt = new DefaultCellFormatter();
+
+    @Test
+    public void formatNull() {
+        assertEquals(UNEX, "", fmt.format(null));
+    }
+
+    @Test
+    public void formatInteger() {
+        assertEquals(UNEX, "3", fmt.format(3));
+    }
+
+    @Test
+    public void formatTrue() {
+        assertEquals(UNEX, "true", fmt.format(true));
+    }
+
+    @Test
+    public void formatFalse() {
+        assertEquals(UNEX, "false", fmt.format(false));
+    }
+
+    @Test
+    public void formatString() {
+        assertEquals(UNEX, "FOO", fmt.format("FOO"));
+    }
+
+    @Test
+    public void formatObject() {
+        assertEquals(UNEX, SOME_STRING, fmt.format(new TestClass()));
+    }
+}