/// <summary>
/// Private constructor to create a new expression using the
/// expression string provided
/// </summary>
/// <param name="expressionString">The expression string</param>
private Expression(string expressionString)
{
//TODO: Error check valid inputs
CriteriaExpression c = new CriteriaExpression(expressionString, _operators);
//Create left expression
if (c.IsLeaf())
{
}
if (c.Left.IsLeaf())
{
_leftExpression = new Parameter(c.Left.CompleteExpression);
}
else
{
_leftExpression = new Expression(c.Left.CompleteExpression);
}
//Create operator
_sqlOperator = new SqlOperator(c.Expression);
//Create right expression
if (c.Right.IsLeaf())
{
_rightExpression = new Parameter(c.Right.CompleteExpression);
}
else
{
_rightExpression = new Expression(c.Right.CompleteExpression);
}
}
// public string SqlExpressionString(string tableNameFieldNameLeftSeperator,
// string tableNameFieldNameRightSeperator,
// string dateTimeLeftSeperator,
// string dateTimeRightSeperator)
// {
// return "(" + _leftExpression.SqlExpressionString(tableNameFieldNameLeftSeperator,
// tableNameFieldNameRightSeperator, dateTimeLeftSeperator, dateTimeRightSeperator) +
// " " + _sqlOperator.ExpressionString() +
// " " + _rightExpression.SqlExpressionString(tableNameFieldNameLeftSeperator,
// tableNameFieldNameRightSeperator, dateTimeLeftSeperator, dateTimeRightSeperator) + ")";
// }
#endregion //IExpression Interface Implementation
#region Static Members
/// <summary>
/// Creates a new IExpression object using the expression string provided.
/// </summary>
/// <param name="expressionClause">The expression string</param>
/// <returns>If the expression is a leaf object (it has no left and right
/// expressions), then a Parameter object is returned, otherwise an
/// Expression object is returned.</returns>
public static IExpression CreateExpression(string expressionClause)
{
CriteriaExpression c = new CriteriaExpression(expressionClause, _operators);
if (c.IsLeaf())
{
return new Parameter(expressionClause);
}
return new Expression(expressionClause);
}
