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<?php

/**
 * CurlInterface
 *
 * An object-oriented shim that wraps the standard PHP cURL library.
 * 
 * This interface has been created so that cURL functionality can be stubbed
 * out for unit testing, or swapped for an alternative library.
 * 
 * @see curl
 * @package
 * @version $id$
 */
interface CurlInterface {

/**
     * errNo
     *
     * Encapsulates curl_errno - Returns the last error number
     * @param resource $ch - A cURL handle returned by init.
     * @access public 
     * @return the error number or 0 if no error occured.
     */
    public function errno($ch);	
	
    /**
     * error
     *
     * Encapsulates curl_error - Return last error string
     * @param resource $ch - A cURL handle returned by init.
     * @access public 
     * @return the error messge or '' if no error occured.
     */	
    public function error($ch);

/**
     * execute
     *
     * Encapsulates curl_exec - Perform a cURL session.
     * @param resource $ch - A cURL handle returned by init.
     * @access public 
     * @return TRUE on success, FALSE on failure.
     */	
    public function execute($ch);

/**
     * init
     *
     * Encapsulates curl_init - Initialize a cURL session.
     * @param string $url - url to use.
     * @access public 
     * @return cURL handle on success, FALSE on failure.
     */	
    public function init($url);
	
    /**
     * setopt
     *
     * Encapsulates curl_setopt - Set an option for cURL transfer.
     * @param resource $ch - A cURL handle returned by init.
     * @param int $opt - The CURLOPT to set.
     * @param mixed $value - The value to set.
     * @access public 
     * @return True on success, FALSE on failure.
     */		
    public function setopt ($ch , $option , $value);
}

/**
 * CurlObject
 *
 * A concrete implementation of CurlInterface using the PHP cURL library.
 *
 * @package
 * @version $id$
 */
class CurlObject implements CurlInterface {
	
    public function errno($ch) {
        return curl_errno($ch);
    }

public function error($ch) {
        return curl_error($ch);
    }	
	
    public function execute($ch) {
        return curl_exec($ch);
    }

public function init($url) {
        return curl_init($url); 
    }
    
    public function setopt ($ch , $option , $value) {
        return curl_setopt($ch, $option, $value);
    }

}