<?
class DOCUMENT {
	/** the name of the document */
	var $name;
	/** the id of the document used
	for internal purposes */
	var $id;
	/** the root element */
	var $root = null;
	
	/** add document to database */
	function add() {
		/** use global db link */
		global $db;
		/** add to DOCUMENTS and get ID */
		$query = "INSERT INTO DOCUMENTS SET
			NAME = '$this->name'";
		$results = mysql_query($query);
		$this->id = mysql_insert_id($db);
		/** add root element if it isn't null */
		if($this->root != null) {
			$this->add_root_element($this->root);
			$query = "UPDATE DOCUMENTS SET
				ROOT_ELEMENT = ".$this->root->id."
				WHERE ID = $this->id";
			$results = mysql_query($query);
		}
	}
	
	function become_by_name($name) {
		$query = "SELECT ID FROM DOCUMENTS WHERE NAME = '$name'";
		$results = mysql_query($query);
		$results = mysql_fetch_row($results);
		$this->become($results[0]);
	}
	
	function become($id) {
		$this->id = $id;
		$this->root = new ELEMENT();
		$query = "SELECT ROOT_ELEMENT, NAME FROM 
			DOCUMENTS WHERE ID = $this->id";
		$results = mysql_query($query);
		$results = mysql_fetch_array($results);
		$this->name = $results["NAME"];
		$this->root->become($results["ROOT_ELEMENT"]);
	}
	
	function delete() {
		/** delete root element */
		$this->root->delete();
		/** delete DOCUMENT entry */
		$query = "DELETE FROM DOCUMENTS WHERE
			ID = $this->id";
		$results = mysql_query($query);
	}
	
	/** update DOCUMENT entry */
	function update() {
		$query = "UPDATE DOCUMENTS SET
			NAME = '$this->name',
			ROOT_ELEMENT = ".$this->root->id."
			WHERE ID = $this->id";
		$results = mysql_query($query);
	}
	
	/** return the XML data of the root element */
	function getXML() {
		$tmp = new ELEMENT();
		$tmp = $this->root;
		$rvalue = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
		/* $rvalue .= "<?xml-stylesheet type=\"text/xsl\" href=\"ClientTrack.xsl\"?>\n"; */
		/* $rvalue .= strtolower($tmp->getXML()); */
		$rvalue .= $tmp->getXML();
		return $rvalue;
	}
	
	/** add root element */
	function add_root_element($element) {
		$this->root = new ELEMENT();
		$this->root = $element;
		$this->root->document = $this->id;
		$this->root->add();
	}

	/** get element ids */
	function search_elements($attname, $attvalue) {
		$query = "SELECT ELEMENT FROM ATTRIBUTES, ELEMENTS WHERE
			ATTRIBUTES.NAME = '$attname' AND
			ATTRIBUTES.VALUE = '$attvalue' AND
			ELEMENTS.ID = ATTRIBUTES.ELEMENT AND
			ELEMENTS.DOCUMENT = $this->id";
		$result = mysql_query($query);
		$rvalue = array();
		for($i = 0; $i < mysql_num_rows($result); $i++) {
			$row = mysql_fetch_row($result);
			array_push($rvalue, $row[0]);
		}
		$rvalue = array_unique($rvalue);
		return $rvalue;
	}
}
?>