public function getInstance()
    {
        if ( ! $class = $this->getClassName())
        {
            $this->log->error(sprintf('"%s" will not be applied to asset "%s" due to an invalid filter name.', $this->filter, $this->resource->getRelativePath()));
        }

        if ($this->ignored or is_null($class) or ! $this->processRequirements()) return;

        // If the class returned is already implements Assetic\Filter\FilterInterface then
        // we can set the instance directly and not worry about using reflection.
        if ($class instanceof FilterInterface)
        {
            $instance = $class;
        }
        else
        {
            $reflection = new ReflectionClass($class);

            // If no constructor is available on the filters class then we'll instantiate
            // the filter without passing in any arguments.
            if ( ! $reflection->getConstructor())
            {
                $instance = $reflection->newInstance();
            }
            else
            {
                $instance = $reflection->newInstanceArgs($this->arguments);
            }
        }

        // Spin through each of the before filtering callbacks and fire each one. We'll
        // pass in an instance of the filter to the callback.
        foreach ($this->before as $callback)
        {
            if (is_callable($callback))
            {
                call_user_func($callback, $instance);
            }
        }

        return $instance;
    }
public function getInstance()
    {
        if ( ! $class = $this->getClassName())
        {
            $this->log->error(sprintf('"%s" will not be applied to asset "%s" due to an invalid filter name.', $this->filter, $this->resource->getRelativePath()));
        }

        if ($this->ignored or is_null($class) or ! $this->processRequirements()) return;

        // If the class returned is already implements Assetic\Filter\FilterInterface then
        // we can set the instance directly and not worry about using reflection.
        if ($class instanceof FilterInterface)
        {
            $instance = $class;
        }
        else
        {
            $reflection = new ReflectionClass($class);

            // If no constructor is available on the filters class then we'll instantiate
            // the filter without passing in any arguments.
            if ( ! $reflection->getConstructor())
            {
                $instance = $reflection->newInstance();
            }
            else
            {
                $instance = $reflection->newInstanceArgs($this->arguments);
            }
        }

        // Spin through each of the before filtering callbacks and fire each one. We'll
        // pass in an instance of the filter to the callback.
        foreach ($this->before as $callback)
        {
            if (is_callable($callback))
            {
                call_user_func($callback, $instance);
            }
        }

        return $instance;
    }
public function getInstance ( ) { if ( ! $ class = $ this -> getClassName ( ) ) { $ this -> log -> error ( sprintf ( '"%s" will not be applied to asset "%s" due to an invalid filter name.' , $ this -> filter , $ this -> resource -> getRelativePath ( ) ) ) ; } if ( $ this -> ignored or is_null ( $ class ) or ! $ this -> processRequirements ( ) ) return ; // If the class returned is already implements Assetic\Filter\FilterInterface then // we can set the instance directly and not worry about using reflection. if ( $ class instanceof FilterInterface ) { $ instance = $ class ; } else { $ reflection = new ReflectionClass ( $ class ) ; // If no constructor is available on the filters class then we'll instantiate // the filter without passing in any arguments. if ( ! $ reflection -> getConstructor ( ) ) { $ instance = $ reflection -> newInstance ( ) ; } else { $ instance = $ reflection -> newInstanceArgs ( $ this -> arguments ) ; } } // Spin through each of the before filtering callbacks and fire each one. We'll // pass in an instance of the filter to the callback. foreach ( $ this -> before as $ callback ) { if ( is_callable ( $ callback ) ) { call_user_func ( $ callback , $ instance ) ; } } return $ instance ; }
Attempt to instantiate the filter if it exists and has not been ignored.

@return null|\Assetic\Filter\FilterInterface
Attempt to instantiate the filter if it exists and has not been ignored .