/// <summary>
/// Initializes a new FieldError structure.
/// </summary>
/// <remarks>Validates the given value and sets the <see cref="ErrorCode"/> property.</remarks>
/// <param name="field">Field.</param>
/// <param name="value">Value that has been tested.</param>
public FieldError(IDbColumn field, object value)
{
this.field = field;
this.value = value;
FieldValidator validator = new FieldValidator(field);
this.errorCode = validator.Validate(value);
}
/// <summary>
/// Checks whether the given value is valid for this column.
/// </summary>
/// <remarks>Checks whether the value contained in the given field obeys basic constraints
/// (nullability, min/max value etc). Returns <see cref="FieldErrorCode"/> that indicates
/// the type of error encountered.</remarks>
/// <param name="value">Value.</param>
/// <returns>Error code.</returns>
/// <example>
/// The folowing example tests values against the HireDate field of the Northwind's Employees table.
/// HireDate is a nullable T-SQL DateTime type (SQL Server). Minimum DateTime value supported by SQL Server is January 1, 1753.
/// <code>
/// EmployeesMeta employees = new EmployeesMeta();
///
/// // The field is nullable.
/// // Validate method returns FieldErrorCode.AllOk.
/// FieldErrorCode allOk = employees.HireDate.Validate(null);
///
/// // Minimum DateTime value supported by SQL Server is January 1, 1753.
/// // Validate method returns FieldErrorCode.OutOfRangeError.
/// FieldErrorCode outOfRangeError = employees.HireDate.Validate(new DateTime(1000, 1, 1));
///
/// // The field cannot accept integer values.
/// // Validate method returns FieldErrorCode.NonCompatibileType.
/// FieldErrorCode nonCompatibileType = employees.HireDate.Validate(0);
/// </code>
/// </example>
public FieldErrorCode Validate(object value)
{
FieldValidator validator = new FieldValidator(this);
return validator.Validate(value);
}