/// <summary>
/// Saves the scheme to the specified file.
/// </summary>
public bool SaveToFile(string fileName, out string errMsg)
{
try
{
XmlDocument xmlDoc = new();
XmlDeclaration xmlDecl = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
xmlDoc.AppendChild(xmlDecl);
// view title
XmlElement rootElem = xmlDoc.CreateElement("SchemeView");
rootElem.SetAttribute("title", SchemeDoc.Title);
xmlDoc.AppendChild(rootElem);
// scheme document
XmlElement documentElem = xmlDoc.CreateElement("Scheme");
rootElem.AppendChild(documentElem);
SchemeDoc.SaveToXml(documentElem);
// scheme components
HashSet <string> prefixes = new();
XmlElement componentsElem = xmlDoc.CreateElement("Components");
rootElem.AppendChild(componentsElem);
foreach (ComponentBase component in Components.Values)
{
if (component is UnknownComponent unknownComponent)
{
componentsElem.AppendChild(unknownComponent.XmlNode);
}
else
{
Type compType = component.GetType();
CompLibSpec compLibSpec = CompManager.GetSpecByType(compType);
// add namespace
if (compLibSpec != null && !prefixes.Contains(compLibSpec.XmlPrefix))
{
rootElem.SetAttribute("xmlns:" + compLibSpec.XmlPrefix, compLibSpec.XmlNs);
prefixes.Add(compLibSpec.XmlPrefix);
}
// create XML element of component
XmlElement componentElem = compLibSpec == null?
xmlDoc.CreateElement(compType.Name) /*standard component*/ :
xmlDoc.CreateElement(compLibSpec.XmlPrefix, compType.Name, compLibSpec.XmlNs);
componentsElem.AppendChild(componentElem);
component.SaveToXml(componentElem);
}
}
// scheme images
XmlElement imagesElem = xmlDoc.CreateElement("Images");
rootElem.AppendChild(imagesElem);
foreach (Image image in SchemeDoc.Images.Values)
{
XmlElement imageElem = xmlDoc.CreateElement("Image");
imagesElem.AppendChild(imageElem);
image.SaveToXml(imageElem);
}
xmlDoc.Save(fileName);
errMsg = "";
return(true);
}
catch (Exception ex)
{
errMsg = ex.BuildErrorMessage(CommonPhrases.SaveViewError);
return(false);
}
}
/// <summary>
/// Loads the view from the specified stream.
/// </summary>
public override void LoadView(Stream stream)
{
// add template bindings as resource
if (!string.IsNullOrEmpty(templateArgs.BindingFileName))
{
Resources.Add(new ViewResource
{
Name = nameof(TemplateBindings),
Path = templateArgs.BindingFileName
});
}
// load XML document
XmlDocument xmlDoc = new();
xmlDoc.Load(stream);
// check data format
XmlElement rootElem = xmlDoc.DocumentElement;
if (!rootElem.Name.Equals("SchemeView", StringComparison.OrdinalIgnoreCase))
{
throw new ScadaException(CommonPhrases.InvalidFileFormat);
}
// load scheme document
if (rootElem.SelectSingleNode("Scheme") is XmlNode schemeNode)
{
SchemeDoc.LoadFromXml(schemeNode);
// update scheme title
if (string.IsNullOrEmpty(Title) && !string.IsNullOrEmpty(SchemeDoc.Title))
{
Title = SchemeDoc.Title;
}
}
// load scheme components
if (rootElem.SelectSingleNode("Components") is XmlNode componentsNode)
{
HashSet <string> errNodeNames = new(); // node names of unloaded components
LoadErrors.AddRange(CompManager.LoadErrors);
foreach (XmlNode compNode in componentsNode.ChildNodes)
{
// create component
ComponentBase component = CompManager.CreateComponent(compNode, out string errMsg);
if (component == null)
{
component = new UnknownComponent {
XmlNode = compNode
};
if (errNodeNames.Add(compNode.Name))
{
LoadErrors.Add(errMsg);
}
}
// load component and add it to view
component.SchemeView = this;
component.LoadFromXml(compNode);
Components[component.ID] = component;
// get max component ID
if (component.ID > maxComponentID)
{
maxComponentID = component.ID;
}
}
}
// load scheme images
if (rootElem.SelectSingleNode("Images") is XmlNode imagesNode)
{
Dictionary <string, Image> images = SchemeDoc.Images;
XmlNodeList imageNodes = imagesNode.SelectNodes("Image");
foreach (XmlNode imageNode in imageNodes)
{
Image image = new();
image.LoadFromXml(imageNode);
if (!string.IsNullOrEmpty(image.Name))
{
images[image.Name] = image;
}
}
}
}