/**
*Renames a child node
* @param I2CE_MagicDataNode $node
*@param string $old
*@param string $new
*@returns boolean. True on success, false on failure
*/
public function renameChild($node, $old, $new)
{
$keys = array(self::TYPE => true, self::VALUE => true, self::CHILDREN => true);
$result = $this->mcoll->findOne(array(self::PATH => $node->getPath(false)), $keys);
if (!is_array($result) || count($result) == 0) {
I2CE::raiseError("Could not update -- non-existing node");
return false;
}
if (($key = array_search($old, $result[self::CHILDREN])) === false) {
I2CE::raiseError("Child {$old} on " . $node->getPath(false) . " does not exist");
return false;
}
$result[self::CHILDREN][$key] = $new;
$newdata = array('$set' => array(self::CHILDREN => $result[self::CHILDREN]));
if (!is_array($res = $this->mcoll->update(array(self::PATH => $node->getPath(false)), $newdata, array('safe' => true))) || array_key_exists('err', $res) && $res['err']) {
I2CE::raiseError("Could not update new children:" . print_r($res, true));
return false;
}
return $this->renameDecendents($node, array($old => $new));
}
/**
* Store the given magic data node (which should be a descendent
* of this instance.) Starts storing at the last added storage
* mechanism until it reaches the first storage mechanism. If it
* fails saving at any storage mechanis, it will call the destroy
* method on that storage mechanism and any remaining one.
*
* @param I2CE_MagicDataNode $node
* @param integer $max The max index of storage objects to save.
* Defaults to -1 meaning we store on all
* mechanisms
* @returns boolean true on success.
*/
public function store($node, $max = -1)
{
if ($node->type == I2CE_MagicDataNode::TYPE_NOT_POPULATED) {
I2CE::raiseError("Trying to store magic data which is unpopulated at " . $node->getPath());
return FALSE;
}
if ($this->num_storage === 0) {
return TRUE;
}
if ($max < 0 || $max > $this->num_storage) {
$max = $this->num_storage - 1;
}
//there is a problem here if there in only one storage mechanism that we have just retrieved/populated from
$fails = array();
for ($i = $max; $i >= 0; $i--) {
if (!$this->storage[$i]->store($node)) {
$fails[] = $i;
}
}
if (count($fails) > 0) {
$fail_max = max($fails);
if ($fail_max == $this->num_storage - 1) {
I2CE::raiseError("Unrecoverable data storage failure for " . $node->getPath());
return false;
//we failed on the permanent data store
}
I2CE::raiseError("Attempting to recover from data storage failure for " . $node->getPath());
//we did not fail on the permanent data store
//we try to clear all caches at and above the failure point.
$cleared = true;
for ($i = $fail_max; $i >= 0; $i--) {
$cleared &= $this->storage[$i]->destroy($node);
}
if (!$cleared) {
I2CE::raiseError("Could not clear cached data for " . $node->getPath());
return false;
}
}
return true;
}
/**
*Renames a child node
* @param I2CE_MagicDataNode $node
*@param string $old
*@param string $new
*@returns boolean. True on success, false on failure
*/
public function renameChild($node, $old, $new)
{
if ($node instanceof I2CE_MagicData) {
$parentPath = '/';
$offset = strlen('/' . $old) + 1;
$fullOffset = strlen($node->getPath(true) . '/' . $old);
// if $old ='old', results in calling SUBSTR(parent,5)
//so if parent = '/old/path' then substr(parent,5) = '/path'
//we want to result in /new/path
} else {
$parentPath = $node->getPath(false);
//e.g.
$offset = strlen($node->getPath(false) . '/' . $old) + 1;
$fullOffset = strlen($node->getPath(true) . '/' . $old);
//child: if $old = 'old' and $node='/some', then calling SUBSTR(parent, 10)
//so if parent = /some/old/path then substr(parent,10) = /path
//we want to result in /some/new/path
}
$newPath = mysql_real_escape_string($this->getChildPath($node, $new, false));
$newFullPath = mysql_real_escape_string($this->getChildPath($node, $new, true));
$oldPath = mysql_real_escape_string($this->getChildPath($node, $old, false));
$qry_node = "UPDATE config_alt SET name = '" . mysql_real_escape_string($new) . "' , path_hash = '" . mysql_real_escape_string($this->getHash($node, $new)) . "' " . "WHERE parent = '" . mysql_real_escape_string($parentPath) . "' AND name = '" . mysql_real_escape_string($old) . "'";
//change direct children
$qry_child = "UPDATE config_alt SET " . " path_hash = MD5(CONCAT('{$newFullPath}', '/',name)) " . ", parent = '{$newPath}' " . "WHERE parent = '{$oldPath}'";
//change descendents
$qry_desc = "UPDATE config_alt SET " . " path_hash = MD5( CONCAT('{$newFullPath}', SUBSTR(parent,{$offset}) , '/',name)) " . ", parent = CONCAT('{$newPath}', SUBSTR(parent,{$offset}) ) " . "WHERE parent LIKE '{$oldPath}/%'";
$this->db->exec($qry_node);
$this->db->exec($qry_child);
$this->db->exec($qry_desc);
return true;
}
/**
* Return the md5 Hash of the path of this object.
* @param I2CE_MagicDataNode $node
* @param string $childPath
* @param boolean $show_top defaults to true if we are to show the parent
* @return string
*/
public function getChildPath($node, $childPath, $show_top = true)
{
if ($show_top) {
if ($node instanceof I2CE_MagicData) {
return $node->getPath(true) . $node->pathDivider() . $childPath;
} else {
return $node->getPath(true) . '/' . $childPath;
}
} else {
if ($node instanceof I2CE_MagicData) {
return '/' . $childPath;
} else {
return $node->getPath(false) . '/' . $childPath;
}
}
}
