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<?php
namespace Bitrix\Perfmon\Sql;
use Bitrix\Main\NotSupportedException;
class Index extends BaseObject
{
public $unique = false;
public $columns = array();
/**
* @param string $name Index name.
* @param boolean $unique Uniqueness flag.
*/
function __construct($name = '', $unique)
{
parent::__construct($name);
$this->unique = (bool)$unique;
}
/**
* Adds column to the index definition.
*
* @param string $name Column name.
*
* @return Index
*/
function addColumn($name)
{
$this->columns[] = trim($name);
$this->setBody(implode(", ", $this->columns));
return $this;
}
/**
* Creates index object from tokens.
* <p>
* If parameter $indexName is not passed then current position should point to the name of the index.
*
* @param Tokenizer $tokenizer Tokens collection.
* @param boolean $unique Uniqueness flag.
* @param string $indexName Optional name of the index.
*
* @return Index
* @throws NotSupportedException
*/
public static function create(Tokenizer $tokenizer, $unique = false, $indexName = '')
{
if (!$indexName)
{
if ($tokenizer->getCurrentToken()->text !== '(')
{
$indexName = $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
}
if ($tokenizer->testUpperText('ON'))
{
$tokenizer->skipWhiteSpace();
/** @noinspection PhpUnusedLocalVariableInspection */
$tableName = $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
$index = new self($indexName, $unique);
if ($tokenizer->testText('('))
{
$tokenizer->skipWhiteSpace();
$token = $tokenizer->getCurrentToken();
$level = $token->level;
$column = '';
do
{
if ($token->text === ',')
{
$index->addColumn($column);
$column = '';
}
else
{
$column .= $token->text;
}
$token = $tokenizer->nextToken();
}
while (!$tokenizer->endOfInput() && $token->level >= $level);
if ($column)
{
$index->addColumn($column);
}
if (!$tokenizer->testText(')'))
throw new NotSupportedException("')' expected. line:".$tokenizer->getCurrentToken()->line);
}
else
{
throw new NotSupportedException("'(' expected. line:".$tokenizer->getCurrentToken()->line);
}
return $index;
}
/**
* Searches token collection for 'ON' keyword.
* <p>
* Advances current position on to next token skipping whitespace.
*
* @param Tokenizer $tokenizer Tokens collection.
*
* @return void
* @throws NotSupportedException
*/
public static function searchTableName(Tokenizer $tokenizer)
{
$lineToken = $tokenizer->getCurrentToken();
while (!$tokenizer->endOfInput())
{
if ($tokenizer->getCurrentToken()->upper === 'ON')
{
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
return;
}
$tokenizer->nextToken();
}
throw new NotSupportedException('Index: table name not found. line: '.$lineToken->line);
}
/**
* Return DDL for index creation.
*
* @param string $dbType Database type (MYSQL, ORACLE or MSSQL).
*
* @return array|string
*/
public function getCreateDdl($dbType = '')
{
return "CREATE ".($this->unique? "UNIQUE ": "")."INDEX ".$this->name." ON ".$this->parent->name."(".$this->body.")";
}
/**
* Return DDL for index destruction.
*
* @param string $dbType Database type (MYSQL, ORACLE or MSSQL).
*
* @return array|string
*/
public function getDropDdl($dbType = '')
{
switch ($dbType)
{
case "MYSQL":
return "DROP INDEX ".$this->name." ON ".$this->parent->name;
case "MSSQL":
return "DROP INDEX ".$this->name." ON ".$this->parent->name;
case "ORACLE":
return "DROP INDEX ".$this->name;
default:
return "// ".get_class($this).":getDropDdl for database type [".$dbType."] not implemented";
}
}
/**
* Return DDL for index modification.
*
* @param BaseObject $target Target object.
* @param string $dbType Database type (MYSQL, ORACLE or MSSQL).
*
* @return array|string
*/
public function getModifyDdl(BaseObject $target, $dbType = '')
{
return array(
$this->getDropDdl($dbType),
$target->getCreateDdl($dbType),
);
}
}
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