BpConfig: allow access to a fake unbound base node

fixes #100

library/Businessprocess/BpConfig.php

@@ -483,6 +483,11 @@ class BpConfig
      */
     public function getNode($name)
     {
+        if ($name === '__unbound__') {
+            return $this->getUnboundBaseNode();
+
+        }
+
         if (array_key_exists($name, $this->nodes)) {
             return $this->nodes[$name];
         }
@@ -506,6 +511,25 @@ class BpConfig
         );
     }
 
+    /**
+     * @return BpNode
+     */
+    public function getUnboundBaseNode()
+    {
+        // Hint: state is useless here, but triggers parent/child "calculation"
+        //       This is an ugly workaround and should be made obsolete
+        $this->calculateAllStates();
+
+        $names = array_keys($this->getUnboundNodes());
+        $bp = new BpNode($this, (object) array(
+            'name' => '__unbound__',
+            'operator' => '&',
+            'child_names' => $names
+        ));
+        $bp->setAlias($this->translate('Unbound nodes'));
+        return $bp;
+    }
+
     /**
      * @param $name
      * @return BpNode

library/Businessprocess/Renderer/Renderer.php

@@ -309,25 +309,7 @@ abstract class Renderer extends Html
 
     protected function createUnboundParent(BpConfig $bp)
     {
-        // Hint: state is useless here, but triggers parent/child "calculation"
-        //       This is an ugly workaround and should be made obsolete
-        foreach ($bp->getBpNodes() as $p) {
-            $p->getState();
-        }
-        $unbound = $bp->getUnboundNodes();
-
-        $parent = new BpNode($bp, (object) array(
-            'name'        => '__unbound__',
-            'operator'    => '|',
-            'child_names' => array_keys($unbound)
-        ));
-        $parent->getState();
-        $parent->setMissing()
-            ->setDowntime(false)
-            ->setAck(false)
-            ->setAlias('Unbound nodes');
-
-        return $parent;
+        return $bp->getNode('__unbound__');
     }
 
     /**