104 lines
3.3 KiB
PHP
104 lines
3.3 KiB
PHP
<?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(string $conflictClass, string $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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* @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 __invoke(AlterTable $alter): array
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{
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$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($alter->getTable());
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foreach ($alter->getActions() as $action) {
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if (!$action instanceof $this->conflictClassDual) {
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$originalAlter->addAction($action);
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continue;
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}
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$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 ($found) {
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$newAlter->addAction($action);
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} else {
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$originalAlter->addAction($action);
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}
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}
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return [$originalAlter, $newAlter];
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}
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}
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