Move creating edges to Graph

README.md

@@ -38,10 +38,10 @@ $madrid = $graph->createVertex('Madrid');
 $cologne = $graph->createVertex('Cologne');
 
 // build some roads
-$cologne->createEdgeTo($madrid);
-$madrid->createEdgeTo($rome);
+$graph->createEdgeDirected($cologne, $madrid);
+$graph->createEdgeDirected($madrid, $rome);
 // create loop
-$rome->createEdgeTo($rome);
+$graph->createEdgeDirected($rome, $rome);
 ```
 
 Let's see which city (Vertex) has a road (i.e. an edge pointing) to Rome:

src/Edge/Directed.php

@@ -3,6 +3,7 @@
 namespace Graphp\Graph\Edge;
 
 use Graphp\Graph\Exception\InvalidArgumentException;
+use Graphp\Graph\Graph;
 use Graphp\Graph\Set\Vertices;
 use Graphp\Graph\Vertex;
 
@@ -23,12 +24,13 @@ class Directed extends Base
     private $to;
 
     /**
-     * create a new directed Edge from Vertex $from to Vertex $to
+     * [Internal] Create a new directed Edge from Vertex $from to Vertex $to
      *
      * @param Vertex $from start/source Vertex
      * @param Vertex $to   end/target Vertex
-     * @see Vertex::createEdgeTo() to create directed edges
-     * @see Vertex::createEdge() to create undirected edges
+     * @see Graph::createEdgeDirected() to create directed edges
+     * @see Graph::createEdgeUndirected() to create undirected edges
+     * @internal
      */
     public function __construct(Vertex $from, Vertex $to)
     {

src/Edge/Undirected.php

@@ -3,6 +3,7 @@
 namespace Graphp\Graph\Edge;
 
 use Graphp\Graph\Exception\InvalidArgumentException;
+use Graphp\Graph\Graph;
 use Graphp\Graph\Vertex;
 use Graphp\Graph\Set\Vertices;
 
@@ -23,11 +24,13 @@ class Undirected extends Base
     private $b;
 
     /**
-     * create a new undirected edge between given vertices
+     * [Internal] Create a new undirected edge between given vertices
      *
      * @param Vertex $a
      * @param Vertex $b
-     * @see Vertex::createEdge() instead
+     * @see Graph::createEdgeUndirected() to create undirected edges
+     * @see Graph::createEdgeDirected() to create directed edges
+     * @internal
      */
     public function __construct(Vertex $a, Vertex $b)
     {

src/Graph.php

@@ -6,6 +6,7 @@
 use Graphp\Graph\Attribute\AttributeBagReference;
 use Graphp\Graph\Edge\Base as Edge;
 use Graphp\Graph\Edge\Directed as EdgeDirected;
+use Graphp\Graph\Edge\Undirected as EdgeUndirected;
 use Graphp\Graph\Exception\BadMethodCallException;
 use Graphp\Graph\Exception\InvalidArgumentException;
 use Graphp\Graph\Exception\OutOfBoundsException;
@@ -111,7 +112,7 @@ public function createGraphCloneEdgeless()
         $graph->getAttributeBag()->setAttributes($this->getAttributeBag()->getAttributes());
         // TODO: set additional graph attributes
         foreach ($this->getVertices() as $originalVertex) {
-            $vertex = $graph->createVertexClone($originalVertex);
+            $graph->createVertexClone($originalVertex);
             // $graph->vertices[$vid] = $vertex;
         }
 
@@ -169,6 +170,40 @@ public function createGraphCloneVertices($vertices)
         return $graph;
     }
 
+    /**
+     * Creates a new undirected (bidirectional) edge between the given two vertices.
+     *
+     * @param  Vertex                   $a
+     * @param  Vertex                   $b
+     * @return EdgeUndirected
+     * @throws InvalidArgumentException
+     */
+    public function createEdgeUndirected(Vertex $a, Vertex $b)
+    {
+        if ($a->getGraph() !== $this) {
+            throw new InvalidArgumentException('Vertices have to be within this graph');
+        }
+
+        return new EdgeUndirected($a, $b);
+    }
+
+    /**
+     * Creates a new directed edge from the given start vertex to given target vertex
+     *
+     * @param  Vertex                   $source source vertex
+     * @param  Vertex                   $target target vertex
+     * @return EdgeDirected
+     * @throws InvalidArgumentException
+     */
+    public function createEdgeDirected(Vertex $source, Vertex $target)
+    {
+        if ($source->getGraph() !== $this) {
+            throw new InvalidArgumentException('Vertices have to be within this graph');
+        }
+
+        return new EdgeDirected($source, $target);
+    }
+
     /**
      * create new clone of the given edge between adjacent vertices
      *
@@ -202,8 +237,8 @@ public function createEdgeCloneInverted(Edge $originalEdge)
      * @return Edge new edge in this graph
      * @uses Edge::getVertices()
      * @uses Graph::getVertex()
-     * @uses Vertex::createEdge() to create a new undirected edge if given edge was undrected
-     * @uses Vertex::createEdgeTo() to create a new directed edge if given edge was directed
+     * @uses Vertex::createEdgeUndirected() to create a new undirected edge if given edge was undrected
+     * @uses Vertex::createEdgeDirected() to create a new directed edge if given edge was directed
      * @uses Edge::getWeight()
      * @uses Edge::setWeight()
      * @uses Edge::getFlow()
@@ -221,10 +256,10 @@ private function createEdgeCloneInternal(Edge $originalEdge, $ia, $ib)
         $b = $this->getVertex($ends[$ib]);
 
         if ($originalEdge instanceof EdgeDirected) {
-            $newEdge = $a->createEdgeTo($b);
+            $newEdge = $this->createEdgeDirected($a, $b);
         } else {
             // create new edge between new a and b
-            $newEdge = $a->createEdge($b);
+            $newEdge = $this->createEdgeUndirected($a, $b);
         }
         // TODO: copy edge attributes
         $newEdge->getAttributeBag()->setAttributes($originalEdge->getAttributeBag()->getAttributes());
@@ -337,7 +372,7 @@ public function addVertex(Vertex $vertex)
      * @param  Edge $edge instance of the new Edge
      * @return void
      * @internal
-     * @see Vertex::createEdge() instead!
+     * @see Graph::createEdgeUndirected() instead!
      */
     public function addEdge(Edge $edge)
     {

src/Vertex.php

@@ -6,7 +6,6 @@
 use Graphp\Graph\Attribute\AttributeBagReference;
 use Graphp\Graph\Edge\Base as Edge;
 use Graphp\Graph\Edge\Directed as EdgeDirected;
-use Graphp\Graph\Edge\Undirected as EdgeUndirected;
 use Graphp\Graph\Exception\BadMethodCallException;
 use Graphp\Graph\Exception\InvalidArgumentException;
 use Graphp\Graph\Set\Edges;
@@ -126,39 +125,13 @@ public function getId()
         return $this->id;
     }
 
-    /**
-     * create new directed edge from this start vertex to given target vertex
-     *
-     * @param  Vertex                   $vertex target vertex
-     * @return EdgeDirected
-     * @throws InvalidArgumentException
-     * @uses Graph::addEdge()
-     */
-    public function createEdgeTo(Vertex $vertex)
-    {
-        return new EdgeDirected($this, $vertex);
-    }
-
-    /**
-     * add new undirected (bidirectional) edge between this vertex and given vertex
-     *
-     * @param  Vertex                   $vertex
-     * @return EdgeUndirected
-     * @throws InvalidArgumentException
-     * @uses Graph::addEdge()
-     */
-    public function createEdge(Vertex $vertex)
-    {
-        return new EdgeUndirected($this, $vertex);
-    }
-
     /**
      * add the given edge to list of connected edges (MUST NOT be called manually)
      *
      * @param  Edge                     $edge
      * @return void
      * @internal
-     * @see self::createEdge() instead!
+     * @see Graph::createEdgeUndirected() instead!
      */
     public function addEdge(Edge $edge)
     {

tests/Edge/EdgeAttributesTest.php

@@ -22,7 +22,7 @@ public function setUp()
         $graph->createVertex(2);
 
         // 1 -> 2
-        $this->edge = $graph->getVertex(1)->createEdge($graph->getVertex(2));
+        $this->edge = $graph->createEdgeUndirected($graph->getVertex(1), $graph->getVertex(2));
     }
 
     public function testCanSetFlowAndCapacity()

tests/Edge/EdgeBaseTest.php

@@ -18,7 +18,7 @@ abstract class EdgeBaseTest extends AbstractAttributeAwareTest
      */
     protected $edge;
 
-    abstract protected function createEdge();
+    abstract protected function createEdgeUndirected();
 
     /**
      * @return Edge
@@ -31,7 +31,7 @@ public function setUp()
         $this->v1 = $this->graph->createVertex(1);
         $this->v2 = $this->graph->createVertex(2);
 
-        $this->edge = $this->createEdge();
+        $this->edge = $this->createEdgeUndirected();
     }
 
     public function testEdgeVertices()
@@ -113,6 +113,6 @@ public function testRemoveWithLoop()
 
     protected function createAttributeAware()
     {
-        return $this->createEdge();
+        return $this->createEdgeUndirected();
     }
 }

tests/Edge/EdgeDirectedTest.php

@@ -4,18 +4,18 @@
 
 class EdgeDirectedTest extends EdgeBaseTest
 {
-    protected function createEdge()
+    protected function createEdgeUndirected()
     {
         // 1 -> 2
-        return $this->v1->createEdgeTo($this->v2);
+        return $this->graph->createEdgeDirected($this->v1, $this->v2);
     }
 
     protected function createEdgeLoop()
     {
         // 1 --\
         // ^   |
         // \---/
-        return $this->v1->createEdgeTo($this->v1);
+        return $this->graph->createEdgeDirected($this->v1, $this->v1);
     }
 
     public function testVerticesEnds()

tests/Edge/EdgeUndirectedTest.php

@@ -4,18 +4,18 @@
 
 class EdgeUndirectedTest extends EdgeBaseTest
 {
-    protected function createEdge()
+    protected function createEdgeUndirected()
     {
         // 1 -- 2
-        return $this->v1->createEdge($this->v2);
+        return $this->graph->createEdgeUndirected($this->v1, $this->v2);
     }
 
     protected function createEdgeLoop()
     {
         // 1 --\
         // |   |
         // \---/
-        return $this->v1->createEdge($this->v1);
+        return $this->graph->createEdgeUndirected($this->v1, $this->v1);
     }
 
     public function testVerticesEnds()