ALF-10771: adding validation to schema compare tool

Added support to DbObjects to accept visitors
Added ValidatingVisitor to invoke suitable validator on each DbObject
Added NameValidator and NullValidator to operate on DbObject types
Added test suites



git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31494 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/util/schemacomp/model/AbstractDbObjectTest.java

@@ -23,10 +23,14 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.inOrder;
 
+import java.util.ArrayList;
+
+import org.alfresco.util.schemacomp.DbObjectVisitor;
 import org.alfresco.util.schemacomp.DiffContext;
 import org.alfresco.util.schemacomp.Differences;
 import org.alfresco.util.schemacomp.Result.Strength;
 import org.alfresco.util.schemacomp.Result.Where;
+import org.alfresco.util.schemacomp.ValidationResult;
 import org.hibernate.dialect.Dialect;
 import org.junit.Before;
 import org.junit.Test;
@@ -55,7 +59,7 @@ public class AbstractDbObjectTest
     public void setUp() throws Exception
     {
         dbObject = new ConcreteDbObject("the_object");
-        ctx = new DiffContext(dialect, differences);
+        ctx = new DiffContext(dialect, differences, new ArrayList<ValidationResult>());
     }
 
     @Test
@@ -116,5 +120,10 @@ public class AbstractDbObjectTest
             Differences differences = ctx.getDifferences();
             differences.add(Where.IN_BOTH_BUT_DIFFERENCE, "left", "right");
         }
+
+        @Override
+        public void accept(DbObjectVisitor visitor)
+        {
+        }
     }
 }