/// <summary>
/// Looks in this instances commands for a matching command -
/// either the first command if name is not set, or the command with the matching name.
/// </summary>
/// <param name="cmdName"></param>
/// <param name="found"></param>
/// <returns></returns>
private bool GetCommandToExecute(string cmdName, out XPathProviderCommandBase found)
{
if (string.IsNullOrEmpty(cmdName))
{
if (this.HasCommands)
{
found = this.Commands[0];
}
else
{
found = null;
}
return(found != null);
}
else
{
if (this.HasCommands)
{
found = this.Commands[cmdName];
}
else
{
found = null;
}
if (null == found)
{
throw new NullReferenceException(string.Format(Errors.CommandWithNameCannotBeFound, cmdName, this.ID));
}
return(true);
}
}
/// <summary>
/// Fills the data into the dataset from the releated command, and then adds the relation constraint to the data set.
/// </summary>
/// <param name="rel"></param>
/// <param name="ds"></param>
/// <param name="source"></param>
/// <param name="context"></param>
protected virtual void FillRelatedData(DataRelation rel, DataSet ds, XPathDataSourceBase source, PDFDataContext context)
{
string cmd = rel.ChildCommand;
XPathProviderCommandBase provider = source.Commands[cmd];
if (null == provider)
{
throw new NullReferenceException(string.Format(Errors.CommandWithNameCannotBeFound, cmd, source.ID));
}
if (!(provider is IPDFDataSetProviderCommand))
{
throw new InvalidCastException(string.Format(Errors.CommandForRelatedDataMustMatchType, typeof(SqlProviderCommand), typeof(SqlProviderCommand)));
}
IPDFDataSetProviderCommand dsProvider = (IPDFDataSetProviderCommand)provider;
dsProvider.FillData(ds, source, this, context);
rel.AddRelation(this, dsProvider, ds, context);
}