public IEnumerable <KeyValuePair <string, IJsonValue> > FindIndexedObjects(IJsonValue obj)
{
HashSet <string> keys = null;
var indexPaths = new HashSet <string>();
foreach (var g in from indexValue in GetObjectIndexValues(obj)
group indexValue by indexValue.Item1
into g select g)
{
indexPaths.Add(g.Key.MemberPath);
HashSet <string> keysForThisIndex = null;
foreach (var tuple in g)
{
if (keysForThisIndex == null)
{
keysForThisIndex = new HashSet <string>(g.Key.FindKeys(tuple.Item2));
}
else
{
keysForThisIndex.IntersectWith(g.Key.FindKeys(tuple.Item2));
}
if (keysForThisIndex.Count == 0)
{
return(Enumerable.Empty <KeyValuePair <string, IJsonValue> >());
}
}
if (keys == null)
{
keys = keysForThisIndex;
}
else
{
keys.IntersectWith(keysForThisIndex);
}
if (keys.Count == 0)
{
return(Enumerable.Empty <KeyValuePair <string, IJsonValue> >());
}
}
if (keys == null)
{
// table scan
var filter = new JsonFilter(obj.JsonPathValues());
return(from rec in MasterTable.Scan()
where filter.Matches(rec.Value)
select rec);
}
else
{
var filter = new JsonFilter(obj.JsonPathValues().Where(pv => !indexPaths.Contains(pv.Path.Path)));
return(from key in keys
from rec in MasterTable.Find(key)
where filter.Matches(rec.Value)
select rec);
}
}
public bool EnsureIndex(IndexDefinition indexDefinition)
{
// Try to not rebuild index, so we check if there exists an equal defintion already
IndexWrapper existing;
if (IndexCache.TryGetValue(indexDefinition.Path, out existing))
{
if (indexDefinition.Options.Equals(existing.IndexDefinition.Options))
{
// phew, existing index was already matching. bail out
return(false);
}
DropIndex(indexDefinition.Path);
}
// An index can not both exclude certain values and at the same time include certain values
var hasIncludeValues = (indexDefinition.Options.IncludeValues != null) &&
(indexDefinition.Options.IncludeValues.Length > 0);
var hasExcludeValues = (indexDefinition.Options.ExcludeValues != null) &&
(indexDefinition.Options.ExcludeValues.Length > 0);
if (hasIncludeValues && hasExcludeValues)
{
throw new KiwiDbException("An index can not have an exclusion list and an inclusion list at the same time.");
}
var index = new IndexWrapper(this, indexDefinition)
{
IsChanged = true
};
IndexCache.Add(indexDefinition.Path, index);
Insert(indexDefinition.Path, JSON.FromObject(indexDefinition));
// rebuild index
foreach (var record in MasterTable.Scan())
{
UpdateIndex(record.Key, null, record.Value);
}
return(true);
}
