Adding validation on address validFrom date (unique by person)

Entity/Person.php

@@ -669,6 +669,44 @@ class Person implements HasCenterInterface {
         }
     }
     
+    /**
+     * Return true if the person has two addresses with the 
+     * same validFrom date (in format 'Y-m-d')
+     */
+    public function hasTwoAdressWithSameValidFromDate()
+    {
+        $validYMDDates = array();
+        
+        foreach ($this->addresses as $ad) {
+            $validDate = $ad->getValidFrom()->format('Y-m-d');
+            
+            if (in_array($validDate, $validYMDDates)) {
+                return true;
+            }
+            $validYMDDates[] = $validDate;
+        }
+        
+        return false;
+    }
+    
+    /**
+     * Validation callback that checks if the addresses are valid (do not have
+     * two addresses with the same validFrom date)
+     *
+     * This method add violation errors.
+     */
+    public function isAddressesValid(ExecutionContextInterface $context)
+    {
+        if ($this->hasTwoAdressWithSameValidFromDate()) {
+            $context->addViolationAt(
+                'addresses',
+                'Two addresses has the same validFrom date',
+                array()
+            );
+        }
+    }
+    
+    
     const ERROR_PERIODS_ARE_COLLAPSING = 1; // when two different periods
     // have days in commun
     const ERROR_ADDIND_PERIOD_AFTER_AN_OPEN_PERIOD = 2; // where there exist
@@ -713,4 +751,4 @@ class Person implements HasCenterInterface {
         
         return true;
     }
-}
+}