protected function _buildSignatures($return, $returnDesc, $paramTypes, $paramDesc)
    {
        $this->_return         = $return;
        $this->_returnDesc     = $returnDesc;
        $this->_paramDesc      = $paramDesc;
        $this->_sigParams      = $paramTypes;
        $this->_sigParamsDepth = count($paramTypes);
        $signatureTrees        = $this->_buildTree();
        $signatures            = array();

        $endPoints = array();
        foreach ($signatureTrees as $root) {
            $tmp = $root->getEndPoints();
            if (empty($tmp)) {
                $endPoints = array_merge($endPoints, array($root));
            } else {
                $endPoints = array_merge($endPoints, $tmp);
            }
        }

        foreach ($endPoints as $node) {
            if (!$node instanceof Zend_Server_Reflection_Node) {
                continue;
            }

            $signature = array();
            do {
                array_unshift($signature, $node->getValue());
                $node = $node->getParent();
            } while ($node instanceof Zend_Server_Reflection_Node);

            $signatures[] = $signature;
        }

        // Build prototypes
        $params = $this->_reflection->getParameters();
        foreach ($signatures as $signature) {
            $return = new Zend_Server_Reflection_ReturnValue(array_shift($signature), $this->_returnDesc);
            $tmp    = array();
            foreach ($signature as $key => $type) {
                $param = new Zend_Server_Reflection_Parameter($params[$key], $type, (isset($this->_paramDesc[$key]) ? $this->_paramDesc[$key] : null));
                $param->setPosition($key);
                $tmp[] = $param;
            }

            $this->_prototypes[] = new Zend_Server_Reflection_Prototype($return, $tmp);
        }
    }