ExtensibleSet: allow to load stored data

library/Director/IcingaConfig/ExtensibleSet.php

@@ -3,7 +3,9 @@
 namespace Icinga\Module\Director\IcingaConfig;
 
 use Icinga\Exception\InvalidPropertyException;
+use Icinga\Exception\ProgrammingError;
 use Icinga\Module\Director\IcingaConfig\IcingaConfigHelper as c;
+use Icinga\Module\Director\Objects\IcingaObject;
 
 class ExtensibleSet
 {
@@ -19,6 +21,22 @@ class ExtensibleSet
 
     protected $inheritedValues = array();
 
+    protected $fromDb = false;
+
+    /**
+     * @var IcingaObject
+     */
+    protected $object;
+
+    /**
+     * Object property name pointing to this set
+     *
+     * This also implies set table called <object_table>_<propertyName>_set
+     *
+     * @var string
+     */
+    protected $propertyName;
+
     public function __construct($values = null)
     {
         if (null !== $values) {
@@ -26,6 +44,103 @@ class ExtensibleSet
         }
     }
 
+    public static function forIcingaObject(IcingaObject $object, $propertyName)
+    {
+        $set = new static;
+
+        if ($set->foreignKey === null) {
+            throw new ProgrammingError(
+                'ExtensibleSet::forIcingaObject requires implementations with a defined $foreignKey'
+            );
+        }
+
+        if ($object->hasBeenLoadedFromDb()) {
+            $set->object = $object;
+            $set->loadFromDb();
+        }
+
+        return $set;
+    }
+
+    public function hasBeenLoadedFromDb()
+    {
+        return $this->fromDb !== null;
+    }
+
+    public function hasBeenModified()
+    {
+        if ($this->hasBeenLoadedFromDb()) {
+
+        } else {
+            if ($this->ownValues === null
+                && empty($this->plusValues)
+                && empty($this->minusValues)
+            ) {
+                return false;
+            } else {
+                return true;
+            }
+        }
+    }
+
+    protected function loadFromDb()
+    {
+        $db = $this->object->getDb();
+
+        $query = $db->select()->from(
+            $this->tableName(),
+            array(
+                'property',
+                'merge_behaviour'
+            )
+        )->where($this->foreignKey() . ' = ?', $this->object->id);
+
+        $byBehaviour = array(
+            'override'  => array(),
+            'extend'    => array(),
+            'blacklist' => array(),
+        );
+
+        foreach ($db->fetchAll($query) as $row) {
+            if (! array_key_exists($row->merge_behaviour, byBehaviour)) {
+                throw new ProgrammingError(
+                    'Got unknown merge_behaviour "%s". Schema change?',
+                    $row->merge_behaviour
+                );
+            }
+
+            $byBehaviour[$row->merge_behaviour][] = $row->property;
+        }
+
+        foreach ($byBehaviour as $method => &$values) {
+            sort($values);
+            $this->$method($values);
+        }
+
+        if (empty($byBehaviour['override'])) {
+            $byBehaviour['override'] = null;
+        }
+
+        $this->fromDb = $byBehaviour;
+
+        return $this;
+    }
+
+    protected function foreignKey()
+    {
+        return $this->object->getShortTableName() . '_id';
+    }
+
+    protected function tableName()
+    {
+        return implode(
+            '_',
+            $this->object->getTableName(),
+            $this->propertyName,
+            'set'
+        );
+    }
+
     public function override($values)
     {
         $this->ownValues       = array();
@@ -110,6 +225,7 @@ class ExtensibleSet
                 $prefix
             );
         }
+
         if (! empty($this->minusValues)) {
             $parts[] = c::renderKeyOperatorValue(
                 $key,
@@ -122,6 +238,22 @@ class ExtensibleSet
         return implode('', $parts);
     }
 
+    public function isRestricted()
+    {
+        return $this->allowedValues === null;
+    }
+
+    public function enumAllowedValues()
+    {
+        if ($this->isRestricted()) {
+            throw new ProgrammingError(
+                'No allowed value set available, this set is not restricted'
+            );
+        }
+
+        return array_combine($this->allowedValues, $this->allowedValues);
+    }
+
     protected function hasBeenResolved()
     {
         return $this->resolvedValues !== null;
@@ -221,6 +353,11 @@ class ExtensibleSet
         return $this;
     }
 
+    protected function translate($string)
+    {
+        return mt('director', $string);
+    }
+
     protected function wantArray($values)
     {
         if (is_array($values)) {