PSR-0 for namespace and filename + tests

FluentInterface/SQL.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace DesignPatterns\FluentInterface;
+
+/**
+ * fluent interface pattern
+ *
+ * Purpose:
+ * to write code that is easy readable just like "real" sentences
+ *
+ * Examples:
+ * - Doctrine2's QueryBuilder works something like that example class below
+ * - PHPUnit uses fluent interfaces to build mock objects
+ * - Yii Framework: CDbCommand and CActiveRecord use this pattern too
+ *
+ */
+class SQL
+{
+    protected $_fields = array();
+    protected $_from = array();
+    protected $_where = array();
+
+    /**
+     *
+     * @param array $fields
+     * @return SQL
+     */
+    public function select(array $fields = array())
+    {
+        $this->_fields = $fields;
+        return $this;
+    }
+
+    /**
+     *
+     * @param string $table
+     * @param string $alias
+     * @return SQL
+     */
+    public function from($table, $alias)
+    {
+        $this->_from[] = $table . ' AS ' . $alias;
+        return $this;
+    }
+
+    /**
+     * @param string $condition
+     * @return SQL
+     */
+    public function where($condition)
+    {
+        $this->_where[] = $condition;
+        return $this;
+    }
+    
+    /**
+     * Gets the query, just an example of building a query, 
+     * no check on consistency
+     */
+    public function getQuery()
+    {
+        return 'SELECT ' . implode(',', $this->_fields) 
+                . ' FROM ' . implode(',', $this->_from)
+                . ' WHERE ' . implode(' AND ', $this->_where);
+    }
+}