<?php

	class QueryArgument {
		var $argument_name;
                var $variable_name;
		var $argument_validator;
		var $column_name;
		var $operation;

		function QueryArgument($tag){
                        static $number_of_arguments = 0;

			$this->argument_name = $tag->attrs->var;
			if(!$this->argument_name) $this->argument_name = $tag->attrs->name;
			if(!$this->argument_name) $this->argument_name = str_replace('.', '_',$tag->attrs->column);

                        $this->variable_name = $this->argument_name;

                        $number_of_arguments++;
                        $this->argument_name .= $number_of_arguments;

			$name = $tag->attrs->name;
			if(!$name) $name = $tag->attrs->column;
			if(strpos($name, '.') === false) $this->column_name = $name;
			else {
                            list($prefix, $name) = explode('.', $name);
                            $this->column_name = $name;
			}

			if($tag->attrs->operation) $this->operation = $tag->attrs->operation;

			$this->argument_validator = new QueryArgumentValidator($tag, $this);

		}

		function getArgumentName(){
			return $this->argument_name;
		}

		function getColumnName(){
			return $this->column_name;
		}

		function getValidatorString(){
			return $this->argument_validator->toString();
		}

                function isConditionArgument(){
                    if($this->operation) return true;
                    return false;
                }

		function toString(){
			if($this->isConditionArgument())
				$arg = sprintf("\n$%s_argument = new ConditionArgument('%s', %s, '%s');\n"
							, $this->argument_name
							, $this->argument_name
                                                        , '$args->'.$this->variable_name
							, $this->operation
							);

			else
				$arg = sprintf("\n$%s_argument = new Argument('%s', %s);\n"
							, $this->argument_name
							, $this->argument_name
                                                        , '$args->'.$this->variable_name);


			$arg .= $this->argument_validator->toString();

			if($this->isConditionArgument()){
				$arg .= sprintf("$%s_argument->createConditionValue();\n"
					, $this->argument_name
					);
			}

			$arg .= sprintf("if(!$%s_argument->isValid()) return $%s_argument->getErrorMessage();\n"
					, $this->argument_name
					, $this->argument_name
					);
			return $arg;
		}

	}

?>