/**
* Build comparison function for this leaf node.
*
* @param array(string) $ancestors Array of parent properties e.g.
* array('Orders', 'Customer',
* 'Customer_Demographics')
*
* @return AnonymousFunction
*/
public function buildComparisonFunction($ancestors)
{
if (count($ancestors) == 0) {
throw new \InvalidArgumentException(Messages::orderByLeafNodeArgumentShouldBeNonEmptyArray());
}
$parameterNames = null;
$accessor1 = null;
$accessor2 = null;
$a = $this->_isAscending ? 1 : -1;
foreach ($ancestors as $i => $anscestor) {
if ($i == 0) {
$parameterNames = array('$' . $anscestor . 'A', '$' . $anscestor . 'B');
$accessor1 = $parameterNames[0];
$accessor2 = $parameterNames[1];
$flag1 = '$flag1 = ' . 'is_null(' . $accessor1 . ') || ';
$flag2 = '$flag2 = ' . 'is_null(' . $accessor2 . ') || ';
} else {
$accessor1 .= '->' . $anscestor;
$accessor2 .= '->' . $anscestor;
$flag1 .= 'is_null(' . $accessor1 . ')' . ' || ';
$flag2 .= 'is_null(' . $accessor2 . ')' . ' || ';
}
}
$accessor1 .= '->' . $this->propertyName;
$accessor2 .= '->' . $this->propertyName;
$flag1 .= 'is_null(' . $accessor1 . ')';
$flag2 .= 'is_null(' . $accessor2 . ')';
$code = "{$flag1}; \n {$flag2}; \n if(\$flag1 && \$flag2) { \n return 0;\n } else if (\$flag1) { \n return {$a}*-1;\n } else if (\$flag2) { \n return {$a}*1;\n }\n \n ";
$type = $this->resourceProperty->getInstanceType();
if ($type instanceof DateTime) {
$code .= " \$result = strtotime({$accessor1}) - strtotime({$accessor2});";
} else {
if ($type instanceof String) {
$code .= " \$result = strcmp({$accessor1}, {$accessor2});";
} else {
if ($type instanceof Guid) {
$code .= " \$result = strcmp({$accessor1}, {$accessor2});";
} else {
$code .= " \$result = (({$accessor1} == {$accessor2}) ? 0 : (({$accessor1} > {$accessor2}) ? 1 : -1));";
}
}
}
$code .= "\n return {$a}*\$result;";
$this->_anonymousFunction = new AnonymousFunction($parameterNames, $code);
return $this->_anonymousFunction;
}