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<?php |
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/** |
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* MIT License |
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* For full license information, please view the LICENSE file that was distributed with this source code. |
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*/ |
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namespace Phinx\Db\Plan\Solver; |
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use Phinx\Db\Plan\AlterTable; |
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/** |
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* A Plan takes an Intent and transforms it into a sequence of |
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* instructions that can be correctly executed by an AdapterInterface. |
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* |
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* The main focus of Plan is to arrange the actions in the most efficient |
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* way possible for the database. |
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*/ |
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class ActionSplitter |
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{ |
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/** |
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* The fully qualified class name of the Action class to match for conflicts |
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* |
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* @var string |
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*/ |
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protected $conflictClass; |
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/** |
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* The fully qualified class name of the Action class to match for conflicts, which |
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* is the dual of $conflictClass. For example `AddColumn` and `DropColumn` are duals. |
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* |
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* @var string |
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*/ |
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protected $conflictClassDual; |
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/** |
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* A callback used to signal the actual presence of a conflict, that will be used to |
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* partition the AlterTable into non-conflicting parts. |
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* |
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* The callback receives as first argument amn instance of $conflictClass and as second |
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* argument an instance of $conflictClassDual |
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* |
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* @var callable |
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*/ |
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protected $conflictFilter; |
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/** |
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* Comstructor |
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* |
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* @param string $conflictClass The fully qualified class name of the Action class to match for conflicts |
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* @param string $conflictClassDual The fully qualified class name of the Action class to match for conflicts, |
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* which is the dual of $conflictClass. For example `AddColumn` and `DropColumn` are duals. |
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* @param callable $conflictFilter The collection of actions to inspect |
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*/ |
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public function __construct($conflictClass, $conflictClassDual, callable $conflictFilter) |
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{ |
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$this->conflictClass = $conflictClass; |
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$this->conflictClassDual = $conflictClassDual; |
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$this->conflictFilter = $conflictFilter; |
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} |
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/** |
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* Returs a sequence of AlterTable instructions that are non conflicting |
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* based on the constructor parameters. |
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* |
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* @param \Phinx\Db\Plan\AlterTable $alter The collection of actions to inspect |
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* |
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* @return \Phinx\Db\Plan\AlterTable[] A list of AlterTable that can be executed without |
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* this type of conflict |
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*/ |
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public function split(AlterTable $alter) |
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{ |
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$conflictActions = array_filter($alter->getActions(), function ($action) { |
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return $action instanceof $this->conflictClass; |
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}); |
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$originalAlter = new AlterTable($alter->getTable()); |
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$newAlter = new AlterTable($alter->getTable()); |
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$actions = array_map(function ($action) use ($conflictActions) { |
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if (!$action instanceof $this->conflictClassDual) { |
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return [$action, null]; |
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} |
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$found = false; |
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$matches = $this->conflictFilter; |
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foreach ($conflictActions as $ca) { |
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if ($matches($ca, $action)) { |
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$found = true; |
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break; |
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} |
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} |
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if ($found) { |
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return [null, $action]; |
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} |
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return [$action, null]; |
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}, $alter->getActions()); |
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foreach ($actions as $pair) { |
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[$original, $new] = $pair; |
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if ($original) { |
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$originalAlter->addAction($original); |
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} |
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if ($new) { |
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$newAlter->addAction($new); |
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} |
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} |
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return [$originalAlter, $newAlter]; |
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} |
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} |
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cakephp /
phinx
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