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<?php
namespace Icinga\Module\Director\Db\Branch;
class PlainObjectPropertyDiff
{
public static function calculate(array $old = null, array $new = null)
{
if ($new === null) {
throw new \RuntimeException('Cannot diff for delete');
}
if ($old === null) {
foreach (BranchSettings::ENCODED_DICTIONARIES as $property) {
self::flattenProperty($new, $property);
}
return $new;
}
$unchangedKeys = [];
foreach (BranchSettings::ENCODED_DICTIONARIES as $property) {
self::flattenProperty($old, $property);
self::flattenProperty($new, $property);
}
foreach ($old as $key => $value) {
if (array_key_exists($key, $new)) {
if ($value === $new[$key]) {
$unchangedKeys[] = $key;
}
} else {
$new[$key] = null;
}
}
foreach ($unchangedKeys as $key) {
unset($new[$key]);
}
return $new;
}
protected static function flattenProperty(array &$properties, $property)
{
// TODO: dots in varnames -> throw or escape?
if (isset($properties[$property])) {
foreach ((array) $properties[$property] as $key => $value) {
$properties["$property.$key"] = $value;
}
unset($properties[$property]);
}
}
}
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