/**
* Recursive function to process each node of the expression
*
* @param AbstractExpression $expression Current node to process.
*
* @return string The language specific expression.
*/
private function _processExpressionNode(AbstractExpression $expression)
{
if ($expression instanceof ArithmeticExpression) {
$left = $this->_processExpressionNode($expression->getLeft());
$right = $this->_processExpressionNode($expression->getRight());
return $this->_expressionProvider->onArithmeticExpression($expression->getNodeType(), $left, $right);
}
if ($expression instanceof LogicalExpression) {
$left = $this->_processExpressionNode($expression->getLeft());
$right = $this->_processExpressionNode($expression->getRight());
return $this->_expressionProvider->onLogicalExpression($expression->getNodeType(), $left, $right);
}
if ($expression instanceof RelationalExpression) {
$left = $this->_processExpressionNode($expression->getLeft());
$right = $this->_processExpressionNode($expression->getRight());
return $this->_expressionProvider->onRelationalExpression($expression->getNodeType(), $left, $right);
}
if ($expression instanceof ConstantExpression) {
return $this->_expressionProvider->onConstantExpression($expression->getType(), $expression->getValue());
}
if ($expression instanceof PropertyAccessExpression) {
return $this->_expressionProvider->onPropertyAccessExpression($expression);
}
if ($expression instanceof FunctionCallExpression) {
$params = array();
foreach ($expression->getParamExpressions() as $paramExpression) {
$params[] = $this->_processExpressionNode($paramExpression);
}
return $this->_expressionProvider->onFunctionCallExpression($expression->getFunctionDescription(), $params);
}
if ($expression instanceof UnaryExpression) {
$child = $this->_processExpressionNode($expression->getChild());
return $this->_expressionProvider->onUnaryExpression($expression->getNodeType(), $child);
}
}
/**
* Populate map table
*
* @param AbstractExpression $nullCheckExpTree The expression to verfiy.
*
* @return void
*
* @throws ODataException
*/
private function _map($nullCheckExpTree)
{
if ($nullCheckExpTree instanceof LogicalExpression) {
$this->_map($nullCheckExpTree->getLeft());
$this->_map($nullCheckExpTree->getRight());
} else {
if ($nullCheckExpTree instanceof UnaryExpression) {
$this->_map($nullCheckExpTree->getChild());
} else {
if ($nullCheckExpTree instanceof FunctionCallExpression) {
$param = $nullCheckExpTree->getParamExpressions();
$this->_map($param[0]);
} else {
if ($nullCheckExpTree instanceof PropertyAccessExpression) {
$parent = $nullCheckExpTree;
$key = null;
do {
$key = $parent->getResourceProperty()->getName() . '_' . $key;
$parent = $parent->getParent();
} while ($parent != null);
$this->_mapTable[$key] = $nullCheckExpTree;
} else {
throw ODataException::createSyntaxError(Messages::expressionParser2UnexpectedExpression(get_class($nullCheckExpTree)));
}
}
}
}
}
