Clause.php

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<?php

namespace Elgg\Database\Clauses;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\QueryBuilder;
use Elgg\Traits\Loggable;

abstract class Clause {

    use Loggable;
    
    abstract public function prepare(QueryBuilder $qb, $table_alias = null);
    
    protected function isCallable($callback) {
        return _elgg_services()->handlers->isCallable($callback);
    }
    
    protected function call($callback, QueryBuilder $qb, $table_alias = null) {
        $service = _elgg_services()->handlers;
        
        $callable = $service->resolveCallable($callback);
        if (!is_callable($callable)) {
            $description = static::class . ' (QueryBuilder, table_alias)';
            $this->getLogger()->warning("Handler for {$description} is not callable: " . $service->describeCallable($callback));
            
            return false;
        }
        
        return call_user_func($callable, $qb, $table_alias);
    }
    
    protected function callJoin($callback, QueryBuilder $qb, $joined_alias, $table_alias = null) {
        $service = _elgg_services()->handlers;
        
        $callable = $service->resolveCallable($callback);
        if (!is_callable($callable)) {
            $description = static::class . ' (QueryBuilder, joined_alias, table_alias)';
            $this->getLogger()->warning("Handler for {$description} is not callable: " . $service->describeCallable($callback));
            
            return false;
        }
        
        return call_user_func($callable, $qb, $joined_alias, $table_alias);
    }
}