private static ToplistBlock ConvertXElementToBlock(XElement xmlBlock)
{
xmlBlock.ThrowIfNull(nameof(xmlBlock));
string title = XDocumentParser.GetAttributeValue(xmlBlock, nameof(ToplistBlock.Title));
int number = XDocumentParser.GetAttributeValue <int>(xmlBlock,
nameof(ToplistBlock.Number));
XElement?itemsXml = XDocumentParser.FindSubelement(xmlBlock,
nameof(ToplistBlock.Items));
if (itemsXml is null)
{
throw new ArgumentException(
"Invalid strcuture of XML document: cannot find toplist items block.",
nameof(xmlBlock)
);
}
var result = new ToplistBlock(title, number);
result.UpdateItems(
XDocumentParser.FindSubelements(itemsXml)
.Select(xmlItem => ConvertXElementToItem(xmlItem, result))
.ToList()
);
return(result);
}
public override bool AddBlock(ToplistBlock block)
{
block.ThrowIfNull(nameof(block));
int insertIndex = CalculateInsertIndex(block.Number);
Blocks.Insert(insertIndex, block);
return(true);
}
private static ToplistItem ConvertXElementToItem(XElement xmlItem, ToplistBlock parentBlock)
{
xmlItem.ThrowIfNull(nameof(xmlItem));
string name = XDocumentParser.GetAttributeValue(xmlItem, nameof(ToplistItem.Name));
int parsedPosition = XDocumentParser.GetAttributeValue <int>(
xmlItem, nameof(ToplistItem.Position)
);
int?position = parsedPosition == -1 ? (int?)null : parsedPosition;
return(new ToplistItem(name, position, parentBlock));
}
private static XElement ConvertBlockToXElement(ToplistBlock block)
{
block.ThrowIfNull(nameof(block));
return(new XElement("Block",
new XAttribute(nameof(ToplistBlock.Title), block.Title),
new XAttribute(nameof(ToplistBlock.Number), block.Number),
new XElement(nameof(block.Items),
block.Items.Select(ConvertItemToXElement).ToArray()
)
));
}
public override bool RemoveBlock(ToplistBlock block)
{
block.ThrowIfNull(nameof(block));
return(Blocks.Remove(block));
}
public void RemoveBlock(ToplistBlock block)
{
block.ThrowIfNull(nameof(block));
_toplist.RemoveBlock(block);
}