Callback.php

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<?php
class Zend_Server_Method_Callback
{
    protected $_class;

    protected $_function;

    protected $_method;

    protected $_type;

    protected $_types = array('function', 'static', 'instance');

    public function __construct($options = null)
    {
        if ((null !== $options) && is_array($options))  {
            $this->setOptions($options);
        }
    }

    public function setOptions(array $options)
    {
        foreach ($options as $key => $value) {
            $method = 'set' . ucfirst($key);
            if (method_exists($this, $method)) {
                $this->$method($value);
            }
        }
        return $this;
    }

    public function setClass($class)
    {
        if (is_object($class)) {
            $class = get_class($class);
        }
        $this->_class = $class;
        return $this;
    }

    public function getClass()
    {
        return $this->_class;
    }

    public function setFunction($function)
    {
        $this->_function = (string) $function;
        $this->setType('function');
        return $this;
    }

    public function getFunction()
    {
        return $this->_function;
    }

    public function setMethod($method)
    {
        $this->_method = $method;
        return $this;
    }

    public function getMethod()
    {
        return $this->_method;
    }

    public function setType($type)
    {
        if (!in_array($type, $this->_types)) {
            #require_once 'Zend/Server/Exception.php';
            throw new Zend_Server_Exception('Invalid method callback type  passed to ' . __CLASS__ . '::' . __METHOD__);
        }
        $this->_type = $type;
        return $this;
    }

    public function getType()
    {
        return $this->_type;
    }

    public function toArray()
    {
        $type = $this->getType();
        $array = array(
            'type' => $type,
        );
        if ('function' == $type) {
            $array['function'] = $this->getFunction();
        } else {
            $array['class']  = $this->getClass();
            $array['method'] = $this->getMethod();
        }
        return $array;
    }
}