/**
* Invoke method, every class will have its own
* returns true/false on completion, setting both
* errormsg and output as necessary
*/
function invoke()
{
parent::invoke();
$result = true;
// Set own core attributes
//$this->does_generate = ACTION_NONE;
$this->does_generate = ACTION_GENERATE_HTML;
// These are always here
global $CFG, $XMLDB;
// Do the job, setting result as needed
if (!data_submitted()) {
// Basic prevention
print_error('wrongcall', 'error');
}
// Get parameters
$dirpath = required_param('dir', PARAM_PATH);
$dirpath = $CFG->dirroot . $dirpath;
$tableparam = strtolower(required_param('table', PARAM_PATH));
$indexparam = strtolower(required_param('index', PARAM_PATH));
$name = trim(strtolower(optional_param('name', $indexparam, PARAM_PATH)));
$comment = required_param('comment', PARAM_CLEAN);
$comment = trim($comment);
$unique = required_param('unique', PARAM_INT);
$fields = required_param('fields', PARAM_CLEAN);
$fields = str_replace(' ', '', trim(strtolower($fields)));
$hints = required_param('hints', PARAM_CLEAN);
$hints = str_replace(' ', '', trim(strtolower($hints)));
$editeddir = $XMLDB->editeddirs[$dirpath];
$structure = $editeddir->xml_file->getStructure();
$table = $structure->getTable($tableparam);
$index = $table->getIndex($indexparam);
$oldhash = $index->getHash();
$errors = array();
// To store all the errors found
// Perform some checks
// Check empty name
if (empty($name)) {
$errors[] = $this->str['indexnameempty'];
}
// Check incorrect name
if ($name == 'changeme') {
$errors[] = $this->str['incorrectindexname'];
}
// Check duplicate name
if ($indexparam != $name && $table->getIndex($name)) {
$errors[] = $this->str['duplicateindexname'];
}
$fieldsarr = explode(',', $fields);
// Check the fields isn't empty
if (empty($fieldsarr[0])) {
$errors[] = $this->str['nofieldsspecified'];
} else {
// Check that there aren't duplicate column names
$uniquearr = array_unique($fieldsarr);
if (count($fieldsarr) != count($uniquearr)) {
$errors[] = $this->str['duplicatefieldsused'];
}
// Check that all the fields in belong to the table
foreach ($fieldsarr as $field) {
if (!$table->getField($field)) {
$errors[] = $this->str['fieldsnotintable'];
break;
}
}
// Check that there isn't any key using exactly the same fields
$tablekeys = $table->getKeys();
if ($tablekeys) {
foreach ($tablekeys as $tablekey) {
$keyfieldsarr = $tablekey->getFields();
// Compare both arrays, looking for differences
$diferences = array_merge(array_diff($fieldsarr, $keyfieldsarr), array_diff($keyfieldsarr, $fieldsarr));
if (empty($diferences)) {
$errors[] = $this->str['fieldsusedinkey'];
break;
}
}
}
// Check that there isn't any index using exactly the same fields
$tableindexes = $table->getIndexes();
if ($tableindexes) {
foreach ($tableindexes as $tableindex) {
// Skip checking against itself
if ($indexparam == $tableindex->getName()) {
continue;
}
$indexfieldsarr = $tableindex->getFields();
// Compare both arrays, looking for differences
$diferences = array_merge(array_diff($fieldsarr, $indexfieldsarr), array_diff($indexfieldsarr, $fieldsarr));
if (empty($diferences)) {
$errors[] = $this->str['fieldsusedinindex'];
break;
}
}
}
}
$hintsarr = array();
foreach (explode(',', $hints) as $hint) {
$hint = preg_replace('/[^a-z]/', '', $hint);
if ($hint === '') {
continue;
}
$hintsarr[] = $hint;
}
if (!empty($errors)) {
$tempindex = new xmldb_index($name);
$tempindex->setUnique($unique);
$tempindex->setFields($fieldsarr);
$tempindex->setHints($hintsarr);
// Prepare the output
$o = '<p>' . implode(', ', $errors) . '</p>
<p>' . $tempindex->readableInfo() . '</p>';
$o .= '<a href="index.php?action=edit_index&index=' . $index->getName() . '&table=' . $table->getName() . '&dir=' . urlencode(str_replace($CFG->dirroot, '', $dirpath)) . '">[' . $this->str['back'] . ']</a>';
$this->output = $o;
}
// Continue if we aren't under errors
if (empty($errors)) {
// If there is one name change, do it, changing the prev and next
// attributes of the adjacent fields
if ($indexparam != $name) {
$index->setName($name);
if ($index->getPrevious()) {
$prev = $table->getIndex($index->getPrevious());
$prev->setNext($name);
$prev->setChanged(true);
}
if ($index->getNext()) {
$next = $table->getIndex($index->getNext());
$next->setPrevious($name);
$next->setChanged(true);
}
}
// Set comment
$index->setComment($comment);
// Set the rest of fields
$index->setUnique($unique);
$index->setFields($fieldsarr);
$index->setHints($hintsarr);
// If the hash has changed from the old one, change the version
// and mark the structure as changed
$index->calculateHash(true);
if ($oldhash != $index->getHash()) {
$index->setChanged(true);
$table->setChanged(true);
// Recalculate the structure hash
$structure->calculateHash(true);
$structure->setVersion(userdate(time(), '%Y%m%d', 99, false));
// Mark as changed
$structure->setChanged(true);
}
// Launch postaction if exists (leave this here!)
if ($this->getPostAction() && $result) {
return $this->launch($this->getPostAction());
}
}
// Return ok if arrived here
return $result;
}
