protected function gatherChanges(DataControllerCallContext $callcontext, DatasetMetaData $originalDataset, DatasetMetaData $modifiedDataset, array $observers = NULL) {
foreach ($modifiedDataset->getColumns(FALSE) as $modifiedColumn) {
$originalColumn = $originalDataset->findColumn($modifiedColumn->name);
if (!isset($originalColumn)) {
// preparing new included & excluded columns
if ($modifiedColumn->isUsed()) {
$callcontext->changeAction->newIncludedColumns[$modifiedColumn->name] = $modifiedColumn;
}
else {
$callcontext->changeAction->newExcludedColumns[$modifiedColumn->name] = $modifiedColumn;
}
// checking if new column marked as part of primary key
if ($modifiedColumn->isKey()) {
$callcontext->changeAction->isKeyUpdated = TRUE;
}
}
}
foreach ($originalDataset->getColumns(FALSE) as $originalColumn) {
$modifiedColumn = $modifiedDataset->findColumn($originalColumn->name);
if (isset($modifiedColumn)) {
$isColumnUpdated = FALSE;
// preparing restored columns
if (!$originalColumn->isUsed() && $modifiedColumn->isUsed()) {
$callcontext->changeAction->restoredColumns[$originalColumn->name] = $originalColumn;
}
// preparing excluded columns
if ($originalColumn->isUsed() && !$modifiedColumn->isUsed()) {
$callcontext->changeAction->excludedColumns[$originalColumn->name] = $originalColumn;
// excluding a column which is part of primary key
if ($originalColumn->isKey()) {
$callcontext->changeAction->isKeyUpdated = TRUE;
}
}
// preparing relocated columns
if ($originalColumn->columnIndex != $modifiedColumn->columnIndex) {
$callcontext->changeAction->updatedIndexColumns[$originalColumn->name] = $originalColumn;
}
// preparing columns with changed data type
if (($originalColumn->type->applicationType != $modifiedColumn->type->applicationType)
|| ($originalColumn->type->getLogicalApplicationType() != $modifiedColumn->type->getLogicalApplicationType())) {
// marking that the column data type was updated
if ($modifiedColumn->isUsed()) {
$callcontext->changeAction->updatedDataTypeIncludedColumns[$originalColumn->name] = $originalColumn;
// updating type a column which is part of the primary key
if ($originalColumn->isKey()) {
$callcontext->changeAction->isKeyUpdated = TRUE;
}
}
else {
$callcontext->changeAction->updatedDataTypeExcludedColumns[$originalColumn->name] = $originalColumn;
}
// checking if old & new types are compatible
if ($this->checkIfDataTypeCompatible($originalColumn->type, $modifiedColumn->type)) {
$callcontext->changeAction->updatedDataTypeCompatibleColumns[$originalColumn->name] = $originalColumn;
}
$isColumnUpdated = TRUE;
}
// checking if any column properties were updated
if (($originalColumn->publicName != $modifiedColumn->publicName)
|| ($originalColumn->description != $modifiedColumn->description)
|| ($originalColumn->source != $modifiedColumn->source)) {
$isColumnUpdated = TRUE;
}
// checking if a column in primary key was added or removed
if ($originalColumn->isKey() != $modifiedColumn->isKey()) {
$isColumnUpdated = TRUE;
$callcontext->changeAction->isKeyUpdated = TRUE;
}
// preparing updated columns
if ($isColumnUpdated) {
$callcontext->changeAction->updatedColumns[$originalColumn->name] = $originalColumn;
}
}
else {
// preparing deleted columns
$callcontext->changeAction->deletedColumns[$originalColumn->name] = $originalColumn;
// deleting a column which is part of the primary key
if ($originalColumn->isKey()) {
$callcontext->changeAction->isKeyUpdated = TRUE;
}
}
}
// preparing updated dataset
if (($originalDataset->publicName != $modifiedDataset->publicName)
|| ($originalDataset->description != $modifiedDataset->description)
|| (compare_values($originalDataset->source, $modifiedDataset->source) != 0)
|| (compare_values($originalDataset->aliases, $modifiedDataset->aliases) != 0)) {
$callcontext->changeAction->isDatasetUpdated = TRUE;
}
}