protected virtual void RegisterMetadata(DataFlowContext context)
{
if (!context.Contains(Model.TypeName))
{
context.Add(Model.TypeName, TableMetadata);
}
}
protected override Task <DataFlowResult> Parse(DataFlowContext context)
{
if (!context.Contains(Model.TypeName))
{
context.Add(Model.TypeName, TableMetadata);
}
return(Task.FromResult(DataFlowResult.Success));
}
protected override Task <DataFlowResult> Parse(DataFlowContext context)
{
if (!context.Contains(_model.TypeName))
{
context.Add(_model.TypeName, _tableMetadata);
}
var selectable = context.GetSelectable();
var results = new ParseResult <T>();
if (selectable.Properties == null)
{
selectable.Properties = new Dictionary <string, object>();
}
var environments = new Dictionary <string, string>();
foreach (var property in context.Response.Request.Properties)
{
environments.Add(property.Key, property.Value);
}
if (_model.ShareValueSelectors != null)
{
foreach (var selector in _model.ShareValueSelectors)
{
string name = selector.Name;
var value = selectable.Select(selector.ToSelector()).GetValue();
if (!environments.ContainsKey(name))
{
environments.Add(name, value);
}
else
{
environments[name] = value;
}
}
}
bool singleExtractor = _model.Selector == null;
if (!singleExtractor)
{
var selector = _model.Selector.ToSelector();
var list = selectable.SelectList(selector).Nodes()?.ToList();
if (list != null)
{
if (_model.Take > 0 && list.Count > _model.Take)
{
list = _model.TakeFromHead
? list.Take(_model.Take).ToList()
: list.Skip(list.Count - _model.Take).ToList();
}
for (var i = 0; i < list.Count; ++i)
{
var item = list.ElementAt(i);
var obj = ParseObject(environments, item, i);
if (obj != null)
{
results.Add(obj);
}
else
{
Logger?.LogWarning($"解析到空数据，类型: {_model.TypeName}");
}
}
}
}
else
{
var obj = ParseObject(environments, selectable, 0);
if (obj != null)
{
results.Add(obj);
}
else
{
Logger?.LogWarning($"解析到空数据，类型: {_model.TypeName}");
}
}
if (results.Count > 0)
{
var items = context.GetParseItem(_model.TypeName);
if (items == null)
{
context.AddParseItem(_model.TypeName, results);
}
else
{
((ParseResult <T>)items).AddRange(results);
}
}
return(Task.FromResult(DataFlowResult.Success));
}