public ICondition Validate(IDataAccessContextBase context, ICondition criteria)
{
var user = this.User;
if (user == null)
{
return(criteria);
}
if (criteria == null)
{
return(Condition.Equal(SITE_ID, user.SiteId));
}
if (criteria.Matches(SITE_ID, matched => matched.Value = user.SiteId) > 0)
{
return(criteria);
}
if (criteria is ConditionCollection conditions && conditions.Combination == ConditionCombination.And)
{
conditions.Add(Condition.Equal(SITE_ID, user.SiteId));
return(conditions);
}
return(ConditionCollection.And(Condition.Equal(SITE_ID, user.SiteId), criteria));
}
public IDataSource GetSource(IDataAccessContextBase context)
{
if (this.EnsureSources())
{
return(this.Selector.GetSource(context, _sources) ?? throw new DataException("No matched data source for this data operation."));
}
throw new DataException($"No data sources for the '{_name}' data provider was found.");
}
public IDataSource GetSource(IDataAccessContextBase context, IReadOnlyList <IDataSource> sources)
{
if (sources == null)
{
return(_source);
}
return(sources[0]);
}
private DataAccessMode GetAccessMode(IDataAccessContextBase context)
{
switch (context.Method)
{
case DataAccessMethod.Exists:
case DataAccessMethod.Select:
case DataAccessMethod.Aggregate:
return(DataAccessMode.ReadOnly);
default:
return(DataAccessMode.WriteOnly);
}
}
public IDataSource GetSource(IDataAccessContextBase context, IReadOnlyList <IDataSource> sources)
{
if (sources == null || sources.Count == 0)
{
return(null);
}
var mode = this.GetAccessMode(context);
var matches = sources.Where(p => (p.Mode & mode) == mode).ToArray();
if (matches.Length == 1)
{
return(matches[0]);
}
//获取一个随机的下标
var index = Zongsoft.Common.Randomizer.GenerateInt32() % matches.Length;
return(matches[index]);
}
protected virtual void OnFiltered(IDataAccessContextBase context)
{
switch (context.Method)
{
case DataAccessMethod.Count:
this.OnCounted((DataCountContextBase)context);
break;
case DataAccessMethod.Exists:
this.OnExisted((DataExistContextBase)context);
break;
case DataAccessMethod.Increment:
this.OnIncremented((DataIncrementContextBase)context);
break;
case DataAccessMethod.Select:
this.OnSelected((DataSelectContextBase)context);
break;
case DataAccessMethod.Delete:
this.OnDeleted((DataDeleteContextBase)context);
break;
case DataAccessMethod.Insert:
this.OnInserted((DataInsertContextBase)context);
break;
case DataAccessMethod.Update:
this.OnUpdated((DataUpdateContextBase)context);
break;
case DataAccessMethod.Upsert:
this.OnUpserted((DataUpsertContextBase)context);
break;
case DataAccessMethod.Execute:
this.OnExecuted((DataExecuteContextBase)context);
break;
}
}
protected override void OnFiltering(IDataAccessContextBase context)
{
//首先调用全局过滤器的前趋部分
foreach (var filter in DataEnvironment.Filters)
{
if (filter == null)
{
continue;
}
var predication = filter as Zongsoft.Services.IPredication;
if (predication == null || predication.Predicate(context))
{
filter.OnFiltering(context);
}
}
//最后调用本数据访问器的过滤器前趋部分
base.OnFiltering(context);
}
void Common.IExecutionFilter <IDataAccessContextBase> .OnFiltering(IDataAccessContextBase context)
{
this.OnFiltering(context);
}
public void OnFiltered(IDataAccessContextBase context)
{
switch (context)
{
case DataExistContextBase existing:
var exists = _exists;
if (exists != null)
{
foreach (var filter in exists)
{
filter.OnFiltered(existing);
}
}
break;
case DataSelectContextBase selection:
var selects = _selects;
if (selects != null)
{
foreach (var filter in selects)
{
filter.OnFiltered(selection);
}
}
break;
case DataDeleteContextBase deletion:
var deletes = _deletes;
if (deletes != null)
{
foreach (var filter in deletes)
{
filter.OnFiltered(deletion);
}
}
break;
case DataInsertContextBase insertion:
var inserts = _inserts;
if (inserts != null)
{
foreach (var filter in inserts)
{
filter.OnFiltered(insertion);
}
}
break;
case DataUpdateContextBase updation:
var updates = _updates;
if (updates != null)
{
foreach (var filter in updates)
{
filter.OnFiltered(updation);
}
}
break;
case DataUpsertContextBase upsertion:
var upserts = _upserts;
if (upserts != null)
{
foreach (var filter in upserts)
{
filter.OnFiltered(upsertion);
}
}
break;
case DataExecuteContextBase execution:
var executes = _executes;
if (executes != null)
{
foreach (var filter in executes)
{
filter.OnFiltered(execution);
}
}
break;
case DataAggregateContextBase aggregation:
var aggregates = _aggregates;
if (aggregates != null)
{
foreach (var filter in aggregates)
{
filter.OnFiltered(aggregation);
}
}
break;
}
}
public IDataSource GetSource(IDataAccessContextBase context)
{
return(_source);
}
