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<?php |
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namespace RDV\Bundle\MigrationBundle\Tools; |
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class DbIdentifierNameGenerator |
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{ |
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/** |
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* Gets the max size of an identifier |
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* |
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* @return int |
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*/ |
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public function getMaxIdentifierSize() |
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{ |
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return 30; |
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} |
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/** |
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* Builds an index name |
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* |
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* @param string $tableName |
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* @param string[] $columnNames |
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* @param bool $uniqueIndex |
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* @param bool $forceHash If FALSE a human readable name is generated if it is possible |
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* If TRUE a name is generated based on a hash (Doctrine standard behaviour) |
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* @return string |
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*/ |
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public function generateIndexName($tableName, $columnNames, $uniqueIndex = false, $forceHash = false) |
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{ |
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return $this->generateIdentifierName( |
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$tableName, |
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$columnNames, |
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$uniqueIndex ? 'UNIQ' : 'IDX', |
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null, |
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$forceHash |
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); |
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} |
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/** |
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* Builds a foreign key constraint name |
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* |
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* @param string $tableName |
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* @param string[] $columnNames |
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* @param bool $forceHash If FALSE a human readable name is generated if it is possible |
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* If TRUE a name is generated based on a hash (Doctrine standard behaviour) |
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* @return string |
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*/ |
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public function generateForeignKeyConstraintName($tableName, $columnNames, $forceHash = false) |
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{ |
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return $this->generateIdentifierName( |
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$tableName, |
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$columnNames, |
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'FK', |
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null, |
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$forceHash |
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); |
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} |
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/** |
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* Generates an identifier from a list of column names obeying a certain string length. |
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* |
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* This is especially important for Oracle, since it does not allow identifiers larger than 30 chars, |
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* however building identifiers automatically for foreign keys, composite keys or such can easily create |
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* very long names. |
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* |
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* @param string|string[] $tableNames A table name or a list of table names |
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* @param string[] $columnNames |
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* @param string $prefix |
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* @param bool|null $upperCase If TRUE the returned string is in upper case; |
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* If FALSE the returned string is in lower case; |
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* If NULL the encoded name id in upper case, not encoded is in lower case |
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* @param bool $forceHash If FALSE a human readable name is generated if it is possible |
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* If TRUE a name is generated based on a hash (Doctrine standard behaviour) |
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* @return string |
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* @throws \InvalidArgumentException |
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* |
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* @SuppressWarnings(PHPMD.NPathComplexity) |
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*/ |
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public function generateIdentifierName( |
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$tableNames, |
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$columnNames, |
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$prefix = '', |
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$upperCase = null, |
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$forceHash = false |
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) { |
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if (empty($tableNames) || (is_array($tableNames) && count($tableNames) === 1 && empty($tableNames[0]))) { |
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throw new \InvalidArgumentException('A table name must not be empty.'); |
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} |
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if (!is_array($tableNames)) { |
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$tableNames = [$tableNames]; |
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} |
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if (!$forceHash) { |
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$columns = implode('_', $columnNames); |
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$tables = implode('_', $tableNames); |
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if (strlen($prefix) + strlen($tables) + strlen($columns) + 2 <= $this->getMaxIdentifierSize()) { |
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$result = $prefix . '_' . $tables . '_' . $columns; |
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return $upperCase === true ? strtoupper($result) : strtolower($result); |
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} |
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} |
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$result = $prefix . '_' . |
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implode( |
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'', |
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array_merge( |
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array_map( |
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function ($name) { |
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return dechex(crc32($name)); |
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}, |
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$tableNames |
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), |
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array_map( |
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function ($name) { |
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return dechex(crc32($name)); |
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}, |
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$columnNames |
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) |
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) |
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); |
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$result = substr($result, 0, $this->getMaxIdentifierSize()); |
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return $upperCase === false ? strtolower($result) : strtoupper($result); |
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} |
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} |
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ramunasd /
MigrationBundle
