/// <summary>
/// Open the document. Either returns a document or throws.
/// </summary>
public CadKit.Interfaces.IDocument open(string name, ChooseBestOpenerDelegate del, object caller)
{
// Re-entrant! Do not lock the mutex!
// Look for existing document with this name.
CadKit.Interfaces.IDocument document = this.findDocument(name);
if (null != document)
{
this.windowsForward(document, caller);
return(document);
}
// Determine the opener that handles this extension.
CadKit.Interfaces.IDocumentOpen opener = this._findBestOpener(name, del, caller);
if (null == opener)
{
System.IO.FileInfo info = new System.IO.FileInfo(name);
throw new System.Exception("Error 4027629339: Failed to find plugin that opens files with extension '" + info.Extension + "'");
}
// Open the document. This may throw.
document = (CadKit.Interfaces.IDocument)(opener.open(name, caller));
// If we get to here then add the new document.
this.addDocument(document);
// Return new document.
return(document);
}
/// <summary>
/// Determine appropriate opener. Pass null for the delegate to get first one.
/// </summary>
private CadKit.Interfaces.IDocumentOpen _findBestOpener(string name, ChooseBestOpenerDelegate del, object caller)
{
// Re-entrant! Do not lock the mutex! When opening plugins they may
// call back to this class and try to lock the mutex.
CadKit.Interfaces.IDocumentOpen[] openers = this._findOpeners(name);
if (null == openers || 0 == openers.Length)
{
return(null);
}
return((null != del) ? openers[del(openers, caller)] : openers[0]);
}