Implemented the capability to modify queries by the mean of a plugin (reintegrated from branch 1.2, release candidate)

SVN:trunk[1849]

core/querymodifier.class.inc.php

@@ -0,0 +1,33 @@
+<?php
+// Copyright (C) 2010 Combodo SARL
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License as published by
+//   the Free Software Foundation; version 3 of the License.
+//
+//   This program is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU General Public License for more details.
+//
+//   You should have received a copy of the GNU General Public License
+//   along with this program; if not, write to the Free Software
+//   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+/**
+ * Interface iQueryModifier
+ * Defines the API to tweak queries (e.g. translate data on the fly) 
+ *
+ * @author      Erwan Taloc <erwan.taloc@combodo.com>
+ * @author      Romain Quetiez <romain.quetiez@combodo.com>
+ * @author      Denis Flaven <denis.flaven@combodo.com>
+ * @license     http://www.opensource.org/licenses/gpl-3.0.html LGPL
+ */
+
+interface iQueryModifier
+{
+	public function __construct();
+
+	public function GetFieldExpression(QueryBuilderContext &$oBuild, $sClass, $sAttCode, $sColId, Expression $oFieldSQLExp, SQLQuery &$oSelect);
+}
+?>