Added functionality to create joins using OOD

src/admin/common/abstract/model/join.php

@@ -0,0 +1,62 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+abstract class AbstractCommonClubsModelJoin
+{
+    
+    protected $tablename;
+    protected $alias;
+    protected $condition;
+    /**
+     * @var AbstractCommonClubsModelColumn[]
+     */
+    protected $columns;
+    
+    public function getAlias()
+    {
+        return $this->alias;
+    }
+    
+    public function getTableName()
+    {
+        return $this->tablename;
+    }
+    
+    public function getOnCondition()
+    {
+        return $this->condition;
+    }
+    
+    public function getColumns()
+    {
+        return $this->columns;
+    }
+    
+    /**
+     * 
+     * @param JDatabaseQuery $q
+     */
+    public function join($q)
+    {
+        $str = "{$this->tablename} AS {$this->alias}";
+        if(isset($this->condition))
+            $str .= " ON {$this->condition}";
+        $this->addJoin($q, $str);
+        
+        foreach($this->columns as $c)
+        {
+            $qc = $q->q("{$this->alias}." . $c->getColumn(), $c->getAlias());
+            $q->select($qc);
+        }
+    }
+    
+    /**
+     * 
+     * @param JDatabaseQuery $q
+     * @param String $str
+     */
+    protected abstract function addJoin($q, $str);
+    
+}

src/admin/common/models/join/innner.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinInner extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->innerJoin($str);
+    }
+}

src/admin/common/models/join/left.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinLeft extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->leftJoin($str);
+    }
+}

src/admin/common/models/join/outer.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinOuter extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->outerJoin($str);
+    }
+}

src/admin/common/models/join/right.php

@@ -0,0 +1,12 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelJoinRight extends AbstractCommonClubsModelJoin
+{
+    protected function addJoin($q, $str)
+    {
+        $q->rightJoin($str);
+    }
+}