/// <summary>
/// Initializes a new <see cref="FilterExpression"/>
/// </summary>
/// <param name="field1">The left side of the expression</param>
/// <param name="operator">The operator</param>
/// <param name="field2">The right side of the expression</param>
/// <param name="andOr">The connection between this and the next expression</param>
public FilterExpression(object field1, FieldOperators @operator, object field2, FieldAndOr andOr)
{
AndOr = andOr;
Field1 = field1;
Operator = @operator;
Field2 = field2;
}
/// <summary>
/// Formats the Operator accordingly to the database dialect
/// </summary>
/// <param name="operator">The opeperator</param>
/// <returns>A string containing the formatted operator</returns>
protected virtual string FormatOperator(FieldOperators @operator)
{
if (Operators == null)
{
throw new Exception($"The '{nameof(Operators)}' Dictionary is null");
}
if (Operators.Count == 0)
{
throw new Exception($"The '{nameof(Operators)}' Dictionary is initialized but empty");
}
if (!Operators.ContainsKey(@operator))
{
throw new Exception($"The operator '{Enum.GetName(typeof(FieldOperators), @operator)}' is not defined");
}
return(Operators[@operator]);
}
/// <summary>
/// Initializes a new expression
/// </summary>
/// <param name="field">The Field to be Processed by the <see cref="Expression"/>.</param>
/// <param name="operator">The Operator. See <see cref="FieldOperators"/> for reference</param>
protected Expression(Field field, FieldOperators @operator) : this(field)
{
Operator = @operator;
}
/// <summary>
/// Initializes a new instance of an <see cref="FilterExpression{T}"/>.
/// </summary>
/// <param name="field">A <see cref="Field"/> to be processed by the expression</param>
/// <param name="operator">The Operator. See <see cref="FieldOperators"/> for reference</param>
/// <param name="values">A <see cref="IList{T}"/> of values</param>
public FilterExpression(Field field, FieldOperators @operator, params T[] values) : this(field, @operator)
{
Values = values;
ParseOperator();
}
/// <summary>
/// Initializes a new instance of an <see cref="FilterExpression{T}"/>.
/// </summary>
/// <param name="field">A <see cref="Field"/> to be processed by the expression</param>
/// <param name="operator">The Operator. See <see cref="FieldOperators"/> for reference</param>
/// <param name="values">A <see cref="IList{T}"/> of values</param>
public FilterExpression(Field field, FieldOperators @operator, IList <T> values) : this(field, @operator)
{
Values = values;
ParseOperator();
}
/// <summary>
/// Initializes a new instance of an <see cref="FilterExpression{T}"/>.
/// </summary>
/// <param name="field">A <see cref="Field"/> to be processed by the expression</param>
/// <param name="value">The Value to be assigned to the field</param>
/// <param name="operator">The Operator. See <see cref="FieldOperators"/> for reference</param>
public FilterExpression(Field field, FieldOperators @operator, T value) : this(field, @operator)
{
Values.Add(value);
ParseOperator();
}
/// <summary>
/// Initializes a new instance of an <see cref="FilterExpression{T}"/>.
/// </summary>
/// <param name="field">A <see cref="Field"/> to be processed by the expression</param>
/// <param name="operator">The Operator. See <see cref="FieldOperators"/> for reference</param>
public FilterExpression(Field field, FieldOperators @operator) : base(field, @operator)
{
Field = field;
ParseOperator();
}
