/**
* Merge two null check expression trees by removing duplicate nodes.
*
* @param AbstractExpression $nullCheckExpTree1 First expression.
* @param AbstractExpression $nullCheckExpTree2 Second expression.
*
* @return UnaryExpression or LogicalExpression
*/
private function _mergeNullableExpressionTrees($nullCheckExpTree1, $nullCheckExpTree2)
{
$this->_mapTable = array();
$this->_map($nullCheckExpTree1);
$this->_map($nullCheckExpTree2);
$expression = null;
$isNullFunctionDescription = null;
foreach ($this->_mapTable as $node) {
if ($expression == null) {
$expression = new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($node->getType()), array($node)), ExpressionType::NOT_LOGICAL, new Boolean());
} else {
$expression = new LogicalExpression($expression, new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($node->getType()), array($node)), ExpressionType::NOT_LOGICAL, new Boolean()), ExpressionType::AND_LOGICAL);
}
}
return $expression;
}
/**
* Function to create a nullable expression subtree for checking the
* nullablilty of parent (and current poperty optionally) properties
*
* @param boolean $includeMe Boolean flag indicating whether to include null
* check for this property along with parents
*
* @return AbstractExpression Instance of UnaryExpression, LogicalExpression
* or Null
*
*/
public function createNullableExpressionTree($includeMe)
{
$basePropertyExpression = $this;
while ($basePropertyExpression != null && $basePropertyExpression->parent != null) {
$basePropertyExpression = $basePropertyExpression->parent;
}
//This property is direct child of ResourceSet, no need to check
//nullability for direct ResourceSet properties
// ($c->CustomerID, $c->Order, $c->Address) unless $includeMe is true
if ($basePropertyExpression == $this) {
if ($includeMe) {
return new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($basePropertyExpression->getType()), array($basePropertyExpression)), ExpressionType::NOT_LOGICAL, new Boolean());
}
return null;
}
//This property is a property of a complex type or resource reference
//$c->Order->OrderID, $c->Address->LineNumber,
// $c->complex1->complex2->primitveVar
//($c->Order != null),($c->Address != null),
// (($c->complex1 != null) && ($c->complex1->complex2 != null))
$expression = new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($basePropertyExpression->getType()), array($basePropertyExpression)), ExpressionType::NOT_LOGICAL, new Boolean());
while ($basePropertyExpression->getChild() != null && $basePropertyExpression->getChild()->getChild() != null) {
$basePropertyExpression = $basePropertyExpression->getChild();
$expression2 = new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($basePropertyExpression->getType()), array($basePropertyExpression)), ExpressionType::NOT_LOGICAL, new Boolean());
$expression = new LogicalExpression($expression, $expression2, ExpressionType::AND_LOGICAL);
}
if ($includeMe) {
$basePropertyExpression = $basePropertyExpression->getChild();
$expression2 = new UnaryExpression(new FunctionCallExpression(FunctionDescription::isNullCheckFunction($basePropertyExpression->getType()), array($basePropertyExpression)), ExpressionType::NOT_LOGICAL, new Boolean());
$expression = new LogicalExpression($expression, $expression2, ExpressionType::AND_LOGICAL);
}
return $expression;
}