Move graph property algorithms to new Algorithm\Property

Author: clue

src/Property/GraphProperty.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Fhaculty\Graph\Algorithm\Property;
+
+use Fhaculty\Graph\Algorithm\BaseGraph;
+
+/**
+ * Simple algorithms for working with Graph properties
+ *
+ * @link https://en.wikipedia.org/wiki/Graph_property
+ */
+class GraphProperty extends BaseGraph
+{
+    /**
+     * checks whether this graph has no edges
+     *
+     * @return boolean
+     */
+    public function isEdgeless()
+    {
+        return !$this->graph->getEdges();
+    }
+
+    /**
+     * checks whether this graph is trivial (one vertex and no edges)
+     *
+     * @return boolean
+     */
+    public function isTrivial()
+    {
+        return (!$this->graph->getEdges() && $this->graph->getNumberOfVertices() === 1);
+    }
+}