/// <summary> Evaluates this rule against a SifDataObject and returns the text value
/// of the <c><OtherId></c> element that satisfied the query. If
/// the OtherIdMapping passed to the constructor included a <i>prefix</i>
/// attribute, the returned value will exclude the prefix string.
///
/// </summary>
/// <param name="data">The SifDataObject the rule is evaluated against
/// </param>
/// <returns> The value of the <c><OtherId></c> element that
/// satisfied the query (excluding the prefix string if applicable), or
/// null if no match found
/// </returns>
/// <param name="version">The SIFVersion to use while evaluating the data object</param>
private SifSimpleType Evaluate(SifDataObject data, SifVersion version)
{
if (data != null)
{
//
// Search all of the OtherId children for one that matches the type
// and optionally the prefix specified by the fMapping
//
ICollection otherIdList = (ICollection)data.GetChild("OtherIdList");
if (otherIdList != null)
{
foreach (SifElement otherId in otherIdList)
{
// Compare the Type attribute
SimpleField typ = otherId.GetField("Type");
if (typ == null || !typ.TextValue.Equals(fMapping.Type))
{
continue;
}
// Optionally compare the prefix and if its a match return
// all text after the prefix string
String prefix = fMapping.Prefix;
if (prefix != null)
{
String val = otherId.TextValue;
if (val != null && val.StartsWith(prefix))
{
return(new SifString(val.Substring(prefix.Length)));
}
}
else
{
return(otherId.SifValue);
}
}
}
}
return(null);
}
