<?php
	class halo_ParameterMethodNameResolver implements halo_IMethodNameResolver {

		private $paramName = 'action';
		private $methodParamNames;

		public function setParamName($paramName) {
			$this->paramName = $paramName;
		}

		public function setMethodParamNames(Array $methodParamNames) {
			$this->methodParamNames = $methodParamNames;
		}

		public function getHandlerMethodName(halo_HttpRequest $request){
			$methodName = '';
			if ($this->methodParamNames !== null) {
				foreach ($this->methodParamNames as $variable) {
					if($request->getParameter($variable) !== null){
						$methodName = $request->getParameter($variable);
						break;
					}
				}
			}

			if ($methodName === null && $this->paramName !== null) {
				$methodName = $request->getParameter($this->paramName);
			}

			if ($methodName !== null && $methodName === "") {
				$methodName = null;
			}

			if ($methodName === null) {
				if ($this->defaultMethodName !== null) {
					$methodName = $this->defaultMethodName;
				}
				else {
					throw new Exception('Handler method, not found');
				}
			}
			return $methodName;
		}
	}
?>