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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Dami;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Dami\Migration\MigrationFiles;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Dami\Migration\SchemaTable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Dami\Migration\Api\MigrationApi;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Rentgen\Schema\Info;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Rentgen\Schema\Manipulation;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Migration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param SchemaTable    $schemaTable        description  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param MigrationFiles $migrationFiles     description  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Manipulation   $schemaManipulation description  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Info           $schemaInfo         description  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(SchemaTable $schemaTable, MigrationFiles $migrationFiles, Manipulation $schemaManipulation, Info $schemaInfo)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->schemaTable = $schemaTable;  | 
            
                            
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                        $this->migrationFiles = $migrationFiles;  | 
            
                            
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                        $this->schemaManipulation = $schemaManipulation;  | 
            
                            
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                        $this->schemaInfo = $schemaInfo;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Migrate the schema to the given version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return integer Number of migrations.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function migrate($version = null, $message = null)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->execute($version, $message);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Migrate the schema to previous version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return integer Number of migrations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function migrateToPreviousVersion($message)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->execute($this->schemaTable->getPreviousVersion(), $message);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Create an instance of migration class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param $className Name of migration class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function createMigrationApiInstance($className)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return new $className($this->schemaManipulation, $this->schemaInfo);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Execute migrate.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $version The version of migration to rollback or migrate.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return integer Number of executed migrations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function execute($version = null, $message = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $migrateUp = null === $version || $version > $this->schemaTable->getCurrentVersion();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $files = $this->migrationFiles->get($version);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (null === $files) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->schemaManipulation->execute('BEGIN'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        try { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($files as $file) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                require_once $file->getPath();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $definition = $this->createMigrationApiInstance($file->getClassName());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if ($message) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $message($file->getName(), $file->getVersion());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if ($migrateUp) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $definition->up();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $definition->down();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                foreach ($definition->getActions() as $action) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    if (!is_callable($action)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        throw new \InvalidArgumentException('Migration must be callable'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $action = call_user_func_array($action, array());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    if ($action instanceof MigrationApi) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        $action->execute();  | 
            
                            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->schemaTable->migrateToVersion($file->getVersion());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->schemaManipulation->execute('COMMIT'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } catch (\Exception $e) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->schemaManipulation->execute('ROLLBACK'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw $e;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return count($files);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: