Add abstract BaseGraph, BaseSet and BaseVertex algorithm base classes

Author: clue

src/BaseGraph.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Fhaculty\Graph\Algorithm;
+
+use Fhaculty\Graph\Algorithm\Base;
+use Fhaculty\Graph\Graph;
+
+/**
+ * Abstract base class for algorithms that operate on a given Graph instance
+ */
+abstract class BaseGraph extends Base
+{
+    /**
+     * Graph to operate on
+     *
+     * @var Graph
+     */
+    protected $graph;
+
+    /**
+     * instantiate new algorithm
+     *
+     * @param Graph $graph Graph to operate on
+     */
+    public function __construct(Graph $graph)
+    {
+        $this->graph = $graph;
+    }
+}

src/BaseSet.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Fhaculty\Graph\Algorithm;
+
+use Fhaculty\Graph\Algorithm\Base;
+use Fhaculty\Graph\Set;
+use Fhaculty\Graph\Graph;
+use Fhaculty\Graph\Walk;
+
+/**
+ * Abstract base class for algorithms that operate on a given Set instance
+ *
+ * @see Set
+ */
+abstract class BaseSet extends Base
+{
+    /**
+     * Set to operate on
+     *
+     * @var Set
+     */
+    protected $set;
+
+    /**
+     * instantiate new algorithm
+     *
+     * @param Graph|Walk|Set $graphOrWalk either the Graph or Walk to operate on (or the common base class Set)
+     */
+    public function __construct(Set $graphOrWalk)
+    {
+        $this->set = $graphOrWalk;
+    }
+}

src/BaseVertex.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Fhaculty\Graph\Algorithm;
+
+use Fhaculty\Graph\Algorithm\Base;
+use Fhaculty\Graph\Vertex;
+
+/**
+ * Abstract base class for algorithms that operate on a given Vertex instance
+ */
+abstract class BaseVertex extends Base
+{
+    /**
+     * Vertex to operate on
+     *
+     * @var Vertex
+     */
+    protected $vertex;
+
+    /**
+     * instantiate new algorithm
+     *
+     * @param Vertex $vertex Vertex to operate on
+     */
+    public function __construct(Vertex $vertex)
+    {
+        $this->vertex = $vertex;
+    }
+}