/// <summary>
/// Compiles an enumeration of DomNode properties (as objects) that matched the conditions of the search predicates</summary>
/// <param name="predicate">Specifies the test conditions for a query</param>
/// <returns>The enumeration of DomNode properties (e.g., DomNodeQueryMatch) satisfying the query</returns>
public IEnumerable <object> Query(IQueryPredicate predicate)
{
m_results.Clear();
// Iterate over all dom nodes under this adapter
foreach (DomNode domNode in DomNode.Subtree)
{
// The results of one DomNode query associate each predicate with matching dom node properties
Dictionary <IQueryPredicate, IList <IQueryMatch> > predicateMatchResults
= new Dictionary <IQueryPredicate, IList <IQueryMatch> >();
// For each queryable item (ie a DomNode) there may be 0 to many "query matches"
// (ie a DomNode property). On success, predicate.Test() will supply one
// IQueryMatch per DomNode property that matched.
IList <IQueryMatch> matchingPropertiesList;
if (predicate.Test(domNode, out matchingPropertiesList))
{
if (matchingPropertiesList != null)
{
predicateMatchResults[predicate] = matchingPropertiesList;
}
// For this queryable, a match is the DomNode that passed the predicate test,
// paired with all its properties that allowed it to satisfy the test
m_results.Add(new DomNodeQueryMatch(domNode, predicateMatchResults));
}
}
// Announce that the search results have changed
ResultsChanged.Raise(this, EventArgs.Empty);
return(m_results);
}
/// <summary>
/// Applies a replacement on the results of the last Query</summary>
/// <param name="replaceInfo">Replacement information</param>
/// <returns>The list of objects on which we just performed a replacement</returns>
public IEnumerable <object> Replace(object replaceInfo)
{
ITransactionContext currentTransaction = null;
try
{
foreach (DomNodeQueryMatch match in m_results)
{
DomNode domNode = match.DomNode;
// Set up undo/redo for the replacement operation
ITransactionContext newTransaction = domNode != null?domNode.GetRoot().As <ITransactionContext>() : null;
if (newTransaction != currentTransaction)
{
{
if (currentTransaction != null)
{
currentTransaction.End();
}
currentTransaction = newTransaction;
if (currentTransaction != null)
{
currentTransaction.Begin("Replace".Localize());
}
}
}
// Apply replacement to all matching items that were found on last search
foreach (IQueryPredicate predicateInfo in match.PredicateMatchResults.Keys)
{
predicateInfo.Replace(match.PredicateMatchResults[predicateInfo], replaceInfo);
}
}
}
catch (InvalidTransactionException ex)
{
// cancel the replacement transaction in the undo/redo queue
if (currentTransaction != null && currentTransaction.InTransaction)
{
currentTransaction.Cancel();
}
if (ex.ReportError)
{
Outputs.WriteLine(OutputMessageType.Error, ex.Message);
}
}
finally
{
// finish the replacement transaction for the undo/redo queue
if (currentTransaction != null && currentTransaction.InTransaction)
{
currentTransaction.End();
}
}
ResultsChanged.Raise(this, EventArgs.Empty);
return(m_results);
}
