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<?php
/*
Copyright (c) InterAKT Online 2000-2005
*/
/**
* This class contains the tNG core (triggers, transactions, errors, etc)
* but does not handle field-based transactions.
* @access public
*/
class tNG {
/**
* The connection that will execute the transaction
* @var object KT_Connection
* @access public
*/
var $connection = null;
/**
* The transaction SQL statement
* @var string
* @access private
*/
var $sql = "";
/**
* Registered triggers
* First dimension is the type of the trigger (STARTER, AFTER, BEFORE, ERROR or END), second dimension is an associative array with (key = callBackFunction,value = priority)
* @var array
* @access protected
*/
var $triggers = array();
/**
* True if the transaction was started (if the starter triggers returned something)
* @var boolean
* @access private
*/
var $started = false;
/**
* The transaction type
* Depending on the class that extends the base class, this changes.
* @var string
* @access protected
*/
var $transactionType = "UNKNOWN";
/**
* Wether the current implementation exports a recordset
* @var boolean
* @access protected
*/
var $exportRecordset = false;
/**
* The transaction result
* @var object resource
* @access private
*/
var $transactionResult = null;
/**
* The error object
* @var object tNG_error
* @access private
*/
var $errObj = null;
/**
* The tNG_dispatcher object
* @var object tNG_dispatcher
* @access public
*/
var $dispatcher = null;
/**
* Constructor. Sets the connection.
* @param object KT_Connection &$connection the connection object
* @access public
*/
function tNG(&$connection) {
$this->connection = &$connection;
KT_setDbType($connection);
}
/**
* Set dispatcher object for the transaction.
* @param object tNG_dispatcher &$dispatcher the dispatcher object
* @access public
*/
function setDispatcher(&$dispatcher) {
$this->dispatcher = &$dispatcher;
}
/**
* Gets the transaction dispatcher
* @return tNG_dispatcher type
* @access public
*/
function &getDispatcher() {
return $this->dispatcher;
}
/**
* Getter for the exportsRecordset property
* @return boolean
* true if the current implementation exports a recordset
* false otherwise
* @access public
*/
function exportsRecordset() {
return $this->exportRecordset;
}
/**
* register a trigger to the current transaction
* @param string $triggerType the trigger type (STARTER, AFTER, BEFORE, ERROR or END)
* @param string $callBackFunction the function name to callback when the trigger is executed
* @param integer $priority the trigger priority
* @access public
*/
function registerConditionalTrigger($condition, $triggerType, $callBackFunction, $priority) {
// check if the trigger type is valid
if (in_array($triggerType,array("STARTER","AFTER","BEFORE","END","ERROR"))) {
$params = array();
if (func_num_args() > 4) {
$params = array_slice(func_get_args(),4);
}
$this->triggers[$triggerType][] = array($condition, $callBackFunction,$priority,$params);
if ($callBackFunction == "Trigger_Default_FormValidation" && isset($this->dispatcher->UnivalProps) && $condition !== true) {
$this->dispatcher->UnivalProps = array();
}
} else {
$this->setError(new tNG_error('UNKNOWN_TRIGGER', array(), array($triggerType)));
}
}
function registerTrigger($triggerType,$callBackFunction,$priority) {
$params = func_get_args();
array_unshift($params,true);
return call_user_func_array(array(&$this, "registerConditionalTrigger"), $params);
}
/**
* Prepares the SQL query to be executed
* To be implemented in derived class
* @access protected
*/
function prepareSQL() {
}
/**
* Executes the Transaction
* Tests the STARTER triggers, executes the BEFORE triggers, the transaction SQL, the AFTER triggers and the END triggers. If error occurs, it executes the ERROR triggers and exits.
* @access public
*/
function executeTransaction() {
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'begin');
if ($this->started) {
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'end');
return false;
}
//calling the starter triggers and terminate execution if we had an error
$ret = $this->executeTriggers("STARTER");
if (is_object($ret)) {
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'end');
return false;
}
if (!$this->started) {
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'end');
return false;
}
$ret = $this->doTransaction();
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'end');
return $ret;
}
/**
* Executes the registered triggers that matches the specified type
* @param string $triggerType (STARTER, AFTER, BEFORE, ERROR and END)
* @access protected
*/
function executeTriggers($triggerType) {
if (isset($this->triggers[$triggerType]) && is_array($this->triggers[$triggerType])) {
uasort($this->triggers[$triggerType],array('tNG','compareTriggers'));
foreach ($this->triggers[$triggerType] as $key => $trigger) {
$run = KT_DynamicData($trigger[0], $this, 'expression');
$runTrigger = false;
$ok = false;
@eval('$runTrigger = ('.$run.');$ok = true;');
if ($ok !== true) {
die('Internal Error.Invalid boolean expression: '.$run);
}
if ($runTrigger) {
$callBackFunction = $trigger[1];
$tempParam = array_reverse($trigger[3]);
$tempParam[] = &$this;
$tempParam = array_reverse($tempParam, true);
tNG_log::log($triggerType, $callBackFunction, 'begin');
$ret = call_user_func_array($callBackFunction,$tempParam);
// call all triggers for ERROR and STARTER tiggers
if ($triggerType != "ERROR") {
if (is_object($ret)) {
tNG_log::log('KT_ERROR');
tNG_log::log($triggerType, $callBackFunction, 'end');
return $ret;
}
}
tNG_log::log($triggerType, $callBackFunction, 'end');
}
}
}
return null;
}
/**
* compares two trigger objects (by their priority)
* @param array $tr1 first trigger
* @param array $tr2 second trigger
* @return integer
* 0 if same priority
* -1 if tr1.priority < tr2.priority
* 1 if tr1.priority > tr2.priority
* @access private
*/
function compareTriggers($tr1 , $tr2) {
if ($tr1[2] == $tr2[2]) {
return 0;
}
return ($tr1[2] < $tr2[2]) ? -1 : 1;
}
/**
* Gets the transaction type
* @return string transaction type
* @access public
*/
function getTransactionType() {
return $this->transactionType;
}
/**
* Gets the started property
* @return boolean
* true if the transaction was started
* false otherwise
* @access public
*/
function isStarted() {
return $this->started;
}
/**
* Sets the started property (the starter triggers are the ones that call this function)
* @param boolean $started
* @access public
*/
function setStarted($started) {
$this->started = $started;
}
/**
* Sets the transaction SQL statement
* @param string $sql
* @access public
*/
function setSQL($sql) {
$this->sql = $sql;
}
/**
* This function is called once the transaction SQL was actually executed
* And only if the execution was succesffully
*/
function postExecuteSql() {
return null;
}
/**
* Parses the SQL error
* Called when the transaction SQL throws an error. It sets the error object message
* @param string $sql the SQL statement that throwed the error message
* @param string $errorMsg the error text message
* @access protected
*/
function &parseSQLError($sql, $errorMsg) {
$sql = KT_escapeAttribute($sql);
$errObj = new tNG_error('SQL_ERROR', array($errorMsg), array($sql));
return $errObj;
}
/**
* Setter for the transaction error object
* @param object tNG_error $errorObj the error object
* @access public
*/
function setError($errorObj) {
$this->errorObj = $errorObj;
}
/**
* Getter for the transaction error object
* @return object tNG_error the error object
* @access public
*/
function &getError() {
$ret = null;
if(isset($this->errorObj)){
$ret = &$this->errorObj;
}
return $ret;
}
/**
* Gets the error message
* @return string transaction error message (formatted)
* @access public
*/
function getErrorMsg() {
$ret_warning = '';
$ret_user = '';
$ret_devel = '';
$errObj = &$this->getError();
if ($errObj) {
$ret_user = $errObj->getDetails();
$ret_devel = $errObj->getDeveloperDetails();
}
return array($ret_warning, $ret_user, $ret_devel);
}
function doTransaction() {
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'begin');
$tmp = $this->getError();
if (is_object($tmp)) {
$this->setError($tmp);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
//calling the before triggers and terminate execution if we had an error
$ret = $this->executeTriggers("BEFORE");
if (is_object($ret)) {
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
//process the SQL for eventual auto-generation
$ret = $this->prepareSQL();
if (is_object($ret)) {
tNG_log::log('KT_ERROR');
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
$ret = $this->getError();
if (is_object($ret)) {
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
//executing the transaction
if ($this->sql != '') {
tNG_log::log('tNG' . $this->transactionType, 'executeTransaction', 'execute sql');
if (!is_array($this->sql)) {
$this->transactionResult = $this->connection->Execute($this->sql);
} else {
for ($i=0;$i<sizeof($this->sql);$i++) {
$this->transactionResult = $this->connection->Execute($this->sql[$i], $this->connection);
if ($this->transactionResult === false) {
break;
}
}
}
//check if the transaction has been done OK
if (!$this->transactionResult) {
$ret = $this->parseSQLError($this->sql, $this->connection->ErrorMsg());
$this->setError($ret);
tNG_log::log('KT_ERROR');
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
}
$ret = $this->postExecuteSql();
if (is_object($ret)) {
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
//if the SQL is a SELECT statement
if (is_object($this->transactionResult)) {
if ($this->transactionResult->RecordCount() == 0) {
$this->transactionResult = null;
}
}
//calling the after triggers
$ret = $this->executeTriggers("AFTER");
if (is_object($ret)) {
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
$ret = $this->executeTriggers("END");
if (is_object($ret)) {
$this->setError($ret);
$this->executeTriggers("ERROR");
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return false;
}
tNG_log::log('tNG' . $this->transactionType, 'doTransaction', 'end');
return true;
}
function rollBackTransaction(&$errorObj) {
$this->setError($errorObj);
$this->executeTriggers('ERROR');
}
}
?>
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