Add cache to main chart.

app/Support/ChartProperties.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace FireflyIII\Support;
+
+
+use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Support\Collection;
+
+/**
+ * Class ChartProperties
+ *
+ * @package FireflyIII\Support
+ */
+class ChartProperties
+{
+
+    /** @var Collection */
+    protected $properties;
+
+    /**
+     *
+     */
+    public function __construct()
+    {
+        $this->properties = new Collection;
+    }
+
+    /**
+     * @param $property
+     */
+    public function addProperty($property)
+    {
+        $this->properties->push($property);
+    }
+
+
+    /**
+     * @return string
+     */
+    public function md5()
+    {
+        $string = '';
+        foreach ($this->properties as $property) {
+
+            if ($property instanceof Collection || $property instanceof EloquentCollection) {
+                $string .= print_r($property->toArray(), true);
+                continue;
+            }
+            if ($property instanceof Carbon) {
+                $string .= $property->toRfc3339String();
+                continue;
+            }
+            if (is_object($property)) {
+                $string .= $property->__toString();
+            }
+            if (is_array($property)) {
+                $string .= print_r($property, true);
+            }
+            $string .= (string)$property;
+        }
+
+        return md5($string);
+    }
+}