DeclarativeSchemaRule.php

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<?php
namespace Magento\TestFramework\Dependency;

class DeclarativeSchemaRule implements RuleInterface
{
    protected $_moduleTableMap;

    public function __construct(array $tables)
    {
        $this->_moduleTableMap = $tables;
    }

    public function getDependencyInfo($currentModule, $fileType, $file, &$contents)
    {
        if ('db_schema' != $fileType || !preg_match('#.*/db_schema\.xml$#', $file)) {
            return [];
        }

        $dependenciesInfo = [];
        $unKnowTables = [];

        $dom = new \DOMDocument();
        $dom->loadXML($contents);
        $tables = $dom->getElementsByTagName('table');
        $constraints = $dom->getElementsByTagName('constraint');

        $tableNames = [];
        $foreignKeyTables = [];
        $foreignKeyReferenceTables = [];

        foreach ($tables as $table) {
            $tableNames[] = $table->getAttribute('name');
        }

        foreach ($constraints as $constraint) {
            $xsiType = $constraint->getAttribute('xsi:type');
            if (strtolower($xsiType) == 'foreign' && $constraint->getAttribute('disabled') !== '1') {
                $foreignKeyTables[] = $constraint->getAttribute('table');
                $foreignKeyReferenceTables[] = $constraint->getAttribute('referenceTable');
            }
        }

        $tableNames = array_unique(array_merge($tableNames, $foreignKeyReferenceTables, $foreignKeyTables));

        foreach ($tableNames as $table) {
            if (!isset($this->_moduleTableMap[$table])) {
                $unKnowTables[$file][$table] = $table;
                continue;
            }
            if (strtolower($currentModule) !== strtolower($this->_moduleTableMap[$table])) {
                $dependenciesInfo[] = [
                    'module' => $this->_moduleTableMap[$table],
                    'type' => RuleInterface::TYPE_HARD,
                    'source' => $table,
                ];
            }
        }

        foreach ($unKnowTables as $tables) {
            foreach ($tables as $table) {
                $dependenciesInfo[] = ['module' => 'Unknown', 'source' => $table];
            }
        }
        return $dependenciesInfo;
    }
}