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doctrine2/lib/Doctrine/Query/Production/SelectExpression.php

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<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.org>.
*/
/**
* SelectExpression = (PathExpressionEndingWithAsterisk | Expression | "(" Subselect ")")
* [["AS"] IdentificationVariable]
*
* @package Doctrine
* @subpackage Query
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Janne Vanhala <jpvanhal@cc.hut.fi>
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link http://www.phpdoctrine.org
* @since 1.0
* @version $Revision$
*/
class Doctrine_Query_Production_SelectExpression extends Doctrine_Query_Production
{
protected $_leftExpression;
protected $_isSubselect;
protected $_fieldIdentificationVariable;
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private $__columnAliasInSql;
public function syntax($paramHolder)
{
// SelectExpression = (PathExpressionEndingWithAsterisk | Expression | "(" Subselect ")")
// [["AS"] IdentificationVariable]
$this->_isSubselect = false;
if ($this->_isPathExpressionEndingWithAsterisk()) {
$this->_leftExpression = $this->AST('PathExpressionEndingWithAsterisk', $paramHolder);
$fieldName = implode('.', $this->_leftExpression->getIdentifiers()) . '.*';
} else if (($this->_isSubselect = $this->_isSubselect()) === true) {
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$this->_parser->match('(');
$this->_leftExpression = $this->AST('Subselect', $paramHolder);
$this->_parser->match(')');
// [TODO] Any way to make it more fancy for user error?
$fieldName = '<Subselect>';
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} else {
$this->_leftExpression = $this->AST('Expression', $paramHolder);
// [TODO] Any way to make it more fancy for user error?
$fieldName = '<Expression>';
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}
if ($this->_isNextToken(Doctrine_Query_Token::T_AS)) {
$this->_parser->match(Doctrine_Query_Token::T_AS);
}
if ($this->_isNextToken(Doctrine_Query_Token::T_IDENTIFIER)) {
$paramHolder->set('fieldName', $fieldName);
// Will return an identifier, with the semantical check already applied
$this->_fieldIdentificationVariable = $this->AST('FieldIdentificationVariable', $paramHolder);
$paramHolder->remove('fieldName');
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}
}
public function semantical($paramHolder)
{
$parserResult = $this->_parser->getParserResult();
// We cannot have aliases for foo.*
if ($this->_leftExpression instanceof Doctrine_Query_Production_PathExpressionEndingWithAsterisk
&& $this->_fieldIdentificationVariable !== null) {
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$this->_parser->semanticalError(
"Cannot assign an identification variable to a path expression ending with asterisk (ie. foo.bar.* AS foobaz)."
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);
}
// Also, we cannot have aliases for path expressions: foo.bar
if ($this->_leftExpression instanceof Doctrine_Query_Production_PathExpressionEndingWithAsterisk
&& $this->_fieldIdentificationVariable !== null) {
$this->_parser->semanticalError(
"Cannot assign an identification variable to a path expression (ie. foo.bar AS foobaz)."
);
}
// Make semantical checks
$this->_leftExpression->semantical($paramHolder);
if($this->_fieldIdentificationVariable !== null) {
$this->_fieldIdentificationVariable->semantical($paramHolder);
}
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}
public function buildSql()
{
return $this->_leftExpression->buildSql() . $this->_buildColumnAliasInSql();
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}
protected function _isPathExpressionEndingWithAsterisk()
{
$token = $this->_parser->lookahead;
$this->_parser->getScanner()->resetPeek();
while (($token['type'] === Doctrine_Query_Token::T_IDENTIFIER) || ($token['value'] === '.')) {
$token = $this->_parser->getScanner()->peek();
}
return $token['value'] === '*';
}
protected function _buildColumnAliasInSql()
{
// Retrieving parser result
$parserResult = $this->_parser->getParserResult();
// Retrieving connection
$conn = $this->_em->getConnection();
switch (get_class($this->_leftExpression)) {
case 'Doctrine_Query_Production_PathExpressionEndingWithAsterisk':
return '';
break;
case 'Doctrine_Query_Production_PathExpression':
// We bring the queryComponent from the class instance
$componentAlias = $this->_leftExpression->getComponentAlias();
$queryComponent = $parserResult->getQueryComponent($componentAlias);
$fieldName = $this->_leftExpression->getFieldName();
// Build the column alias now
$columnAlias = $parserResult->getTableAliasFromComponentAlias($componentAlias)
. Doctrine_Query_Production::SQLALIAS_SEPARATOR
. $queryComponent['metadata']->getColumnName($fieldName);
break;
default:
// We bring the default queryComponent
$componentAlias = Doctrine_Query_Production::DEFAULT_QUERYCOMPONENT;
$queryComponent = $parserResult->getQueryComponent($componentAlias);
// If we have FieldIdentificationVariable, we have to use the scalar map of it
if ($this->_fieldIdentificationVariable !== null) {
$columnAlias = $this->_fieldIdentificationVariable->getColumnAlias();
} else {
// We have to include the map now, since we don't have the scalar mapped
$queryFields = $parserResult->getQueryFields();
$itemIndex = 'item' . count(array_filter($queryFields, array($this, "_nonIdentifiedVariable")));
$idx = count($queryFields);
$queryComponent['scalar'][$idx] = $itemIndex;
$parserResult->setQueryComponent($componentAlias, $queryComponent);
// And also in field aliases
$parserResult->setQueryField($itemIndex, $idx);
// Build the column alias
$columnAlias = $parserResult->getTableAliasFromComponentAlias($componentAlias)
. Doctrine_Query_Production::SQLALIAS_SEPARATOR . $idx;
}
break;
}
return ' AS ' . $conn->quoteIdentifier($columnAlias);
}
protected function _nonIdentifiedVariable($value)
{
return ! is_string($value);
}
/* Getters */
public function getLeftExpression()
{
return $this->_leftExpression;
}
public function isSubselect()
{
return $this->_isSubselect;
}
public function getFieldIdentificationVariable()
{
return $this->_fieldIdentificationVariable;
}
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}