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 <?php
 
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Select
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @see Zend_Db_Select
  */
 // require_once 'Zend/Db/Select.php';
 
 
 /**
  * @see Zend_Db_Table_Abstract
  */
 // require_once 'Zend/Db/Table/Abstract.php';
 
 
 /**
  * Class for SQL SELECT query manipulation for the Zend_Db_Table component.
  *
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Table
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Db_Table_Select extends Zend_Db_Select
 {
     /**
      * Table schema for parent Zend_Db_Table.
      *
      * @var array
      */
     protected $_info;
 
     /**
      * Table integrity override.
      *
      * @var array
      */
     protected $_integrityCheck = true;
 
     /**
      * Table instance that created this select object
      *
      * @var Zend_Db_Table_Abstract
      */
     protected $_table;
 
     /**
      * Class constructor
      *
      * @param Zend_Db_Table_Abstract $adapter
      */
     public function __construct(Zend_Db_Table_Abstract $table)
     {
         parent::__construct($table->getAdapter());
 
         $this->setTable($table);
     }
 
     /**
      * Return the table that created this select object
      *
      * @return Zend_Db_Table_Abstract
      */
     public function getTable()
     {
         return $this->_table;
     }
 
     /**
      * Sets the primary table name and retrieves the table schema.
      *
      * @param Zend_Db_Table_Abstract $adapter
      * @return Zend_Db_Select This Zend_Db_Select object.
      */
     public function setTable(Zend_Db_Table_Abstract $table)
     {
         $this->_adapter = $table->getAdapter();
         $this->_info    = $table->info();
         $this->_table   = $table;
 
         return $this;
     }
 
     /**
      * Sets the integrity check flag.
      *
      * Setting this flag to false skips the checks for table joins, allowing
      * 'hybrid' table rows to be created.
      *
      * @param Zend_Db_Table_Abstract $adapter
      * @return Zend_Db_Select This Zend_Db_Select object.
      */
     public function setIntegrityCheck($flag = true)
     {
         $this->_integrityCheck = $flag;
         return $this;
     }
 
     /**
      * Tests query to determine if expressions or aliases columns exist.
      *
      * @return boolean
      */
     public function isReadOnly()
     {
         $readOnly = false;
         $fields   = $this->getPart(Zend_Db_Table_Select::COLUMNS);
         $cols     = $this->_info[Zend_Db_Table_Abstract::COLS];
 
         if (!count($fields)) {
             return $readOnly;
         }
 
         foreach ($fields as $columnEntry) {
             $column = $columnEntry[1];
             $alias = $columnEntry[2];
 
             if ($alias !== null) {
                 $column = $alias;
             }
 
             switch (true) {
                 case ($column == self::SQL_WILDCARD):
                     break;
 
                 case ($column instanceof Zend_Db_Expr):
                 case (!in_array($column, $cols)):
                     $readOnly = true;
                     break 2;
             }
         }
 
         return $readOnly;
     }
 
     /**
      * Adds a FROM table and optional columns to the query.
      *
      * The table name can be expressed
      *
      * @param  array|string|Zend_Db_Expr|Zend_Db_Table_Abstract $name The table name or an
                                                                       associative array relating
                                                                       table name to correlation
                                                                       name.
      * @param  array|string|Zend_Db_Expr $cols The columns to select from this table.
      * @param  string $schema The schema name to specify, if any.
      * @return Zend_Db_Table_Select This Zend_Db_Table_Select object.
      */
     public function from($name, $cols = self::SQL_WILDCARD, $schema = null)
     {
         if ($name instanceof Zend_Db_Table_Abstract) {
             $info = $name->info();
             $name = $info[Zend_Db_Table_Abstract::NAME];
             if (isset($info[Zend_Db_Table_Abstract::SCHEMA])) {
                 $schema = $info[Zend_Db_Table_Abstract::SCHEMA];
             }
         }
 
         return $this->joinInner($name, null, $cols, $schema);
     }
 
     /**
      * Performs a validation on the select query before passing back to the parent class.
      * Ensures that only columns from the primary Zend_Db_Table are returned in the result.
      *
      * @return string|null This object as a SELECT string (or null if a string cannot be produced)
      */
     public function assemble()
     {
         $fields  = $this->getPart(Zend_Db_Table_Select::COLUMNS);
         $primary = $this->_info[Zend_Db_Table_Abstract::NAME];
         $schema  = $this->_info[Zend_Db_Table_Abstract::SCHEMA];
 
 
         if (count($this->_parts[self::UNION]) == 0) {
 
             // If no fields are specified we assume all fields from primary table
             if (!count($fields)) {
                 $this->from($primary, self::SQL_WILDCARD, $schema);
                 $fields = $this->getPart(Zend_Db_Table_Select::COLUMNS);
             }
 
             $from = $this->getPart(Zend_Db_Table_Select::FROM);
 
             if ($this->_integrityCheck !== false) {
                 foreach ($fields as $columnEntry) {
                     list($table, $column) = $columnEntry;
 
                     // Check each column to ensure it only references the primary table
                     if ($column) {
                         if (!isset($from[$table]) || $from[$table]['tableName'] != $primary) {
                             // require_once 'Zend/Db/Table/Select/Exception.php';
                             throw new Zend_Db_Table_Select_Exception('Select query cannot join with another table');
                         }
                     }
                 }
             }
         }
 
         return parent::assemble();
     }
 }