internal override IEnumerable <IndexNode> Run(CollectionPage col, IndexService indexer)
{
var left = _left.Run(col, indexer);
var right = _right.Run(col, indexer);
return(left.Union(right, new IndexNodeComparer()));
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
var v = _value.Normalize(index.Options);
return(indexer
.FindAll(index, Query.Ascending)
.Where(x => x.Key.IsString && x.Key.AsString.Contains(v)));
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
foreach (var value in _values.Distinct())
{
foreach (var node in Query.EQ(this.Field, value).ExecuteIndex(indexer, index))
{
yield return(node);
}
}
}
/// <summary>
/// Find witch index will be used and run Execute method
/// </summary>
internal virtual IEnumerable <IndexNode> Run(CollectionPage col, IndexService indexer)
{
// get index for this query
var index = col.GetIndex(this.Field);
// no index? throw an index not found exception to auto-create in LiteDatabse
if (index == null)
{
throw new IndexNotFoundException(col.CollectionName, this.Field);
}
// execute query to get all IndexNodes
return(this.ExecuteIndex(indexer, index));
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
var value = _value.Normalize(index.Options);
foreach (var node in indexer.FindAll(index, Query.Ascending))
{
var diff = node.Key.CompareTo(value);
if (diff == 1 || (!_equals && diff == 0))
{
break;
}
if (node.IsHeadTail(index))
{
yield break;
}
yield return(node);
}
}
public DbEngine(IDiskService disk, Logger log)
{
// initialize disk service and check if database exists
var isNew = disk.Initialize();
// new database? create new database
if (isNew)
{
disk.CreateNew();
}
_log = log;
_disk = disk;
// initialize all services
_cache = new CacheService();
_pager = new PageService(_disk, _cache);
_indexer = new IndexService(_pager);
_data = new DataService(_pager);
_collections = new CollectionService(_pager, _indexer, _data);
_transaction = new TransactionService(_disk, _pager, _cache);
// check user verion
}
public CollectionService(PageService pager, IndexService indexer, DataService data)
{
_pager = pager;
_indexer = indexer;
_data = data;
}
/// <summary> /// Abstract method that must be implement for index seek/scan - Returns IndexNodes that match with index /// </summary> internal abstract IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index);
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
throw new NotSupportedException();
}
internal override IEnumerable<IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
var value = _value.Normalize(index.Options);
return indexer.FindAll(index, Query.Ascending).Where(x => x.Key.CompareTo(value) != 0);
}
internal override IEnumerable <IndexNode> ExecuteIndex(IndexService indexer, CollectionIndex index)
{
return(indexer.FindAll(index, _order));
}
