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<?php
namespace Bitrix\Perfmon\Sql;
use Bitrix\Main\NotSupportedException;
class Index extends BaseObject
{
public $unique = false;
public $fulltext = false;
public $using = '';
public $columns = [];
/**
* @param string $name Index name.
* @param bool $unique Uniqueness flag.
* @param bool $fulltext Fulltext flag.
*/
public function __construct($name = '', $unique, $fulltext=false)
{
parent::__construct($name);
$this->unique = (bool)$unique;
$this->fulltext = (bool)$fulltext;
}
/**
* Adds column to the index definition.
*
* @param string $name Column name.
*
* @return Index
*/
public function addColumn($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 bool $unique Uniqueness flag.
* @param bool $fulltext Fulltext flag.
* @param string $indexName Optional name of the index.
*
* @return Index
* @throws NotSupportedException
*/
public static function create(Tokenizer $tokenizer, $unique = false, $fulltext = false, $indexName = '')
{
if (!$indexName)
{
if ($tokenizer->getCurrentToken()->text !== '(')
{
$indexName = $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
}
if ($tokenizer->testUpperText('ON'))
{
$tokenizer->skipWhiteSpace();
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
if ($tokenizer->testUpperText('USING'))
{
$tokenizer->skipWhiteSpace();
$indexType = $tokenizer->getCurrentToken()->text;
if (strtoupper($indexType) !== 'GIN')
{
throw new NotSupportedException("'GIN' expected. line:" . $tokenizer->getCurrentToken()->line);
}
$fulltext = true;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
$index = new self($indexName, $unique, $fulltext);
if ($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);
}
//USING BTREE
$tokenizer->skipWhiteSpace();
if ($tokenizer->testText('USING'))
{
$tokenizer->skipWhiteSpace();
$token = $tokenizer->nextToken();
$index->using = $token->text;
}
}
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 = '')
{
switch ($dbType)
{
case 'MYSQL':
return 'CREATE ' . ($this->fulltext ? 'FULLTEXT ' : '') . ($this->unique ? 'UNIQUE ' : '') . 'INDEX ' . $this->name . ' ON ' . $this->parent->name . '(' . $this->body . ')';
case 'PGSQL':
return 'CREATE ' . ($this->unique ? 'UNIQUE ' : '') . 'INDEX ' . $this->name . ' ON ' . $this->parent->name . ($this->fulltext ? ' USING GIN (' . $this->body . ')' : '(' . $this->body . ')');
default:
return '// ' . get_class($this) . ':getDropDdl for database type [' . $dbType . '] not implemented';
}
}
/**
* 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':
case 'MSSQL':
return 'DROP INDEX ' . $this->name . ' ON ' . $this->parent->name;
case 'ORACLE':
case 'PGSQL':
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 [
$this->getDropDdl($dbType),
$target->getCreateDdl($dbType),
];
}
}