htmlpurifier/library/HTMLPurifier/TokenFactory.php

<?php

/**
 * Factory for token generation (PHP 5 only).
 * 
 * @note Doing some benchmarking indicates that the new operator is much
 *       slower than the clone operator (even discounting the cost of the
 *       constructor).  This class is for that optimization.  We may want to
 *       consider porting this to PHP 4 by virtue of the fact it makes the code
 *       easier to read.  Other then that, there's not much point as we don't
 *       maintain parallel HTMLPurifier_Token hierarchies (the main reason why
 *       you'd want to use an abstract factory).
 */
class HTMLPurifier_TokenFactory
{
    
    /**
     * Prototypes that will be cloned.
     * @private
     */
    // p stands for prototype
    private $p_start, $p_end, $p_empty, $p_text, $p_comment;
    
    /**
     * Generates blank prototypes for cloning.
     */
    public function __construct() {
        $this->p_start  = new HTMLPurifier_Token_Start('', array());
        $this->p_end    = new HTMLPurifier_Token_End('');
        $this->p_empty  = new HTMLPurifier_Token_Empty('', array());
        $this->p_text   = new HTMLPurifier_Token_Text('');
        $this->p_comment= new HTMLPurifier_Token_Comment('');
    }
    
    /**
     * Creates a HTMLPurifier_Token_Start.
     * @param $name Tag name
     * @param $attr Associative array of attributes
     * @return Generated HTMLPurifier_Token_Start
     */
    public function createStart($name, $attr = array()) {
        $p = clone $this->p_start;
        $p->__construct($name, $attr);
        return $p;
    }
    
    /**
     * Creates a HTMLPurifier_Token_End.
     * @param $name Tag name
     * @return Generated HTMLPurifier_Token_End
     */
    public function createEnd($name) {
        $p = clone $this->p_end;
        $p->__construct($name);
        return $p;
    }
    
    /**
     * Creates a HTMLPurifier_Token_Empty.
     * @param $name Tag name
     * @param $attr Associative array of attributes
     * @return Generated HTMLPurifier_Token_Empty
     */
    public function createEmpty($name, $attr = array()) {
        $p = clone $this->p_empty;
        $p->__construct($name, $attr);
        return $p;
    }
    
    /**
     * Creates a HTMLPurifier_Token_Text.
     * @param $data Data of text token
     * @return Generated HTMLPurifier_Token_Text
     */
    public function createText($data) {
        $p = clone $this->p_text;
        $p->__construct($data);
        return $p;
    }
    
    /**
     * Creates a HTMLPurifier_Token_Comment.
     * @param $data Data of comment token
     * @return Generated HTMLPurifier_Token_Comment
     */
    public function createComment($data) {
        $p = clone $this->p_comment;
        $p->__construct($data);
        return $p;
    }
    
}