add checker of key existance

src/PriorityList.php

@@ -3,18 +3,18 @@
 namespace Sokil\DataType;
 
 class PriorityList implements \Iterator, \Countable
-{    
+{
     private $lastSequence = 0;
-    
+
     private $list;
-    
+
     const ORDER_ASC = 'asc';
     const ORDER_DESC = 'desc';
-    
+
     private $order = self::ORDER_DESC;
-    
+
     /**
-     * 
+     *
      * @param string $key name
      * @param string $value value
      * @param string $priority priority
@@ -26,32 +26,37 @@ public function set($key, $value, $priority = 0)
         $this->list[$key]->value = $value;
         $this->list[$key]->priority = (int) $priority;
         $this->list[$key]->sequence = $this->lastSequence++;
-        
+
         return $this->list[$key];
     }
-    
+
     public function get($name)
     {
         return isset($this->list[$name]) ? $this->list[$name]->value : null;
     }
-
+
+    public function has($name)
+    {
+        return isset($this->list[$name]);
+    }
+
     public function count()
     {
         return count($this->list);
     }
-    
+
     public function setAscOrder()
     {
         $this->order = self::ORDER_ASC;
         return $this;
     }
-    
+
     public function setDescOrder()
     {
         $this->order = self::ORDER_DESC;
         return $this;
     }
-    
+
     private function ascSortStrategy($declaration1, $declaration2)
     {
         if($declaration1->priority === $declaration2->priority) {
@@ -60,7 +65,7 @@ private function ascSortStrategy($declaration1, $declaration2)
 
         return $declaration1->priority > $declaration2->priority ? 1 : -1;
     }
-    
+
     private function descSortStrategy($declaration1, $declaration2)
     {
         if($declaration1->priority === $declaration2->priority) {
@@ -69,34 +74,34 @@ private function descSortStrategy($declaration1, $declaration2)
 
         return $declaration1->priority < $declaration2->priority ? 1 : -1;
     }
-    
+
     public function rewind()
     {
         uasort($this->list, array($this, $this->order . 'SortStrategy'));
         reset($this->list);
     }
-    
+
     public function current()
     {
         $item = current($this->list);
         return $item->value;
     }
-    
+
     public function key()
     {
         return key($this->list);
     }
-    
+
     public function next()
     {
         next($this->list);
     }
-    
+
     public function valid()
     {
         return null !== $this->key();
     }
-    
+
     public function toArray()
     {
         return iterator_to_array($this);

tests/PriorityListTest.php

@@ -7,118 +7,128 @@ class PriorityListTest extends \PHPUnit_Framework_TestCase
     public function testToArrayDesc()
     {
         $list = new PriorityList();
-        
+
         $this->assertEquals(array('a' => 'a', 'b' => 'b'), array('b' => 'b', 'a' => 'a'));
-        
+
         $list->set('k1', 'v1', 2);
         $list->set('k2', 'v2', 8);
         $list->set('k3', 'v3', 16);
         $list->set('k4', 'v4', 1);
         $list->set('k5', 'v5', 4);
-        
+
         $expectedArray = array(
-            'k3' => 'v3', 
+            'k3' => 'v3',
             'k2' => 'v2',
             'k5' => 'v5',
             'k1' => 'v1',
             'k4' => 'v4',
         );
-        
+
         foreach($list as $key => $value) {
             $this->assertEquals(key($expectedArray), $key);
             $this->assertEquals(current($expectedArray), $value);
-            
+
             next($expectedArray);
         }
-        
+
         if(key($expectedArray)) {
             $this->fail('Actual list less than expected');
         }
     }
-    
+
     public function testToArrayAsc()
     {
         $list = new PriorityList();
-        
+
         $list->setAscOrder();
-        
+
         $list->set('k1', 'v1', 2);
         $list->set('k2', 'v2', 8);
         $list->set('k3', 'v3', 16);
         $list->set('k4', 'v4', 1);
         $list->set('k5', 'v5', 4);
-        
+
         $expectedArray = array(
             'k4' => 'v4',
             'k1' => 'v1',
             'k5' => 'v5',
             'k2' => 'v2',
             'k3' => 'v3',
         );
-        
+
         foreach($list as $key => $value) {
             $this->assertEquals(key($expectedArray), $key);
             $this->assertEquals(current($expectedArray), $value);
-            
+
             next($expectedArray);
         }
-        
+
         if(key($expectedArray)) {
             $this->fail('Actual list less than expected');
         }
     }
-    
+
     public function testGet()
     {
         $list = new PriorityList();
-        
+
         $list->set('k1', 'v1', 2);
         $list->set('k2', 'v2', 8);
         $list->set('k3', 'v3', 16);
         $list->set('k4', 'v4', 1);
         $list->set('k5', 'v5', 4);
-        
+
         $this->assertEquals('v5', $list->get('k5'));
     }
-
+
+    public function testHas()
+    {
+        $list = new PriorityList();
+
+        $list->set('k1', 'v1', 2);
+
+        $this->assertTrue($list->has('k1'));
+        $this->assertFalse($list->has('UNKNOWN_KEY'));
+    }
+
     public function testGet_KeyNotExists()
     {
         $list = new PriorityList();
-        
+
         $list->set('k1', 'v1', 2);
         $list->set('k2', 'v2', 8);
         $list->set('k3', 'v3', 16);
         $list->set('k4', 'v4', 1);
         $list->set('k5', 'v5', 4);
-        
+
         $this->assertEquals(null, $list->get('KEY_NOT_EXISTS'));
     }
-    
+
     public function testToArray()
     {
         $list = new PriorityList();
-        
+
         $list->set('k1', 'v1', 2);
         $list->set('k2', 'v2', 8);
         $list->set('k3', 'v3', 16);
         $list->set('k4', 'v4', 1);
         $list->set('k5', 'v5', 4);
-        
+
         $expectedArray = array(
-            'k3' => 'v3', 
+            'k3' => 'v3',
             'k2' => 'v2',
             'k5' => 'v5',
             'k1' => 'v1',
             'k4' => 'v4',
         );
-        
+
         foreach($list->toArray() as $key => $value) {
             $this->assertEquals(key($expectedArray), $key);
             $this->assertEquals(current($expectedArray), $value);
-            
+
             next($expectedArray);
         }
-        
+
         if(key($expectedArray)) {
             $this->fail('Actual list less than expected');
         }