/// <summary>
/// Drop an index from a collection
/// </summary>
public bool DropIndex(string collection, string field)
{
if (collection.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(collection));
}
if (field.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(field));
}
if (field == "_id")
{
throw LiteException.IndexDropId();
}
return(Transaction <bool>(collection, false, (col) =>
{
// no collection, no index
if (col == null)
{
return false;
}
// search for index reference
var index = col.GetIndex(field);
// no index, no drop
if (index == null)
{
return false;
}
_log.Write(Logger.Command, "drop index on '{0}' :: '{1}'", collection, field);
// delete all data pages + indexes pages
_indexer.DropIndex(index);
// clear index reference
index.Clear();
// mark collection page as dirty
_pager.SetDirty(col);
return true;
}));
}
internal LiteFileInfo(LiteEngine engine, string id, string filename)
{
if (!IdPattern.IsMatch(id))
{
throw LiteException.InvalidFormat(id);
}
_engine = engine;
Id = id;
Filename = Path.GetFileName(filename);
MimeType = MimeTypeConverter.GetMimeType(Filename);
Length = 0;
Chunks = 0;
UploadDate = DateTime.Now;
Metadata = new BsonDocument();
}
/// <summary>
/// Copy all file content to a steam
/// </summary>
public LiteFileInfo Download(string id, Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var file = FindById(id);
if (file == null)
{
throw LiteException.FileNotFound(id);
}
file.CopyTo(stream);
return(file);
}
/// <summary>
/// Try execute some action while has lock exception
/// </summary>
public static void TryExec(Action action, TimeSpan timeout)
{
var timer = DateTime.UtcNow.Add(timeout);
do
{
try
{
action();
return;
}
catch (IOException ex)
{
ex.WaitIfLocked(25);
}
}while (DateTime.UtcNow < timer);
throw LiteException.LockTimeout(timeout);
}
/// <summary>
/// Rename a collection
/// </summary>
public bool RenameCollection(string collection, string newName)
{
if (collection.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(collection));
}
if (newName.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(newName));
}
return(Transaction <bool>(collection, false, (col) =>
{
if (col == null)
{
return false;
}
_log.Write(Logger.Command, "rename collection '{0}' -> '{1}'", collection, newName);
// check if newName already exists
if (GetCollectionNames().Contains(newName, StringComparer.OrdinalIgnoreCase))
{
throw LiteException.AlreadyExistsCollectionName(newName);
}
// change collection name and save
col.CollectionName = newName;
// set collection page as dirty
_pager.SetDirty(col);
// update header collection reference
var header = _pager.GetPage <HeaderPage>(0);
header.CollectionPages.Remove(collection);
header.CollectionPages.Add(newName, col.PageID);
_pager.SetDirty(header);
return true;
}));
}
/// <summary>
/// Test if cache still valid (if datafile was changed by another process reset cache)
/// Returns true if file was changed
/// [Thread Safe]
/// </summary>
private bool DetectDatabaseChanges()
{
// if disk are exclusive don't need check dirty read
if (_disk.IsExclusive)
{
return(false);
}
// empty cache? just exit
if (_cache.CleanUsed == 0)
{
return(false);
}
_log.Write(Logger.Cache, "checking disk to detect database changes from another process");
// get ChangeID from cache
var header = _cache.GetPage(0) as HeaderPage;
var changeID = header == null ? 0 : header.ChangeID;
// and get header from disk
var disk = BasePage.ReadPage(_disk.ReadPage(0)) as HeaderPage;
// if disk header are in recovery mode, throw exception to datafile re-open and recovery pages
if (disk.Recovery)
{
_log.Write(Logger.Error, "datafile in recovery mode, need re-open database");
throw LiteException.NeedRecover();
}
// if header change, clear cache and add new header to cache
if (disk.ChangeID != changeID)
{
_log.Write(Logger.Cache, "file changed from another process, cleaning all cache pages");
_cache.ClearPages();
_cache.AddPage(disk);
return(true);
}
return(false);
}
/// <summary>
/// Add a new collection. Check if name the not exists
/// </summary>
public CollectionPage Add(string name)
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentNullException(nameof(name));
}
if (!CollectionPage.NamePattern.IsMatch(name))
{
throw LiteException.InvalidFormat(name);
}
_log.Write(Logger.Command, "creating new collection '{0}'", name);
// get header marked as dirty because I will use header after (and NewPage can get another header instance)
var header = _pager.GetPage <HeaderPage>(0);
// check limit count (8 bytes per collection = 4 to string length, 4 for uint pageID)
if (header.CollectionPages.Sum(x => x.Key.Length + 8) + name.Length + 8 >= CollectionPage.MAX_COLLECTIONS_SIZE)
{
throw LiteException.CollectionLimitExceeded(CollectionPage.MAX_COLLECTIONS_SIZE);
}
// get new collection page (marked as dirty)
var col = _pager.NewPage <CollectionPage>();
// add this page to header page collection
header.CollectionPages.Add(name, col.PageID);
col.CollectionName = name;
// set header page as dirty
_pager.SetDirty(header);
// create PK index
var pk = _indexer.CreateIndex(col);
pk.Field = "_id";
pk.Expression = "$._id";
pk.Unique = true;
return(col);
}
/// <summary>
/// Read a page with correct instance page object. Checks for pageType
/// </summary>
public static BasePage ReadPage(byte[] buffer)
{
var reader = new ByteReader(buffer);
var pageID = reader.ReadUInt32();
var pageType = (PageType)reader.ReadByte();
if (pageID == 0 && (byte)pageType > 5)
{
throw LiteException.InvalidDatabase();
}
var page = CreateInstance(pageID, pageType);
page.ReadHeader(reader);
page.ReadContent(reader);
page.DiskData = buffer;
return(page);
}
/// <summary>
/// Enter in Exclusive lock mode
/// </summary>
public LockControl Write()
{
// if already in exclusive, do nothing
if (_thread.IsWriteLockHeld)
{
return(new LockControl(false, () => { }));
}
// let's test if is not in read lock
if (_thread.IsReadLockHeld)
{
throw new NotSupportedException("Not support Write lock inside a Read lock");
}
// try enter in write mode (thread)
if (!_thread.TryEnterWriteLock(_timeout))
{
throw LiteException.LockTimeout(_timeout);
}
_log.Write(Logger.Lock, "entered in write lock mode in thread #{0}", ThreadId);
// try enter in exclusive mode in disk
var position = _disk.Lock(LockState.Write, _timeout);
// call avoid dirty only if not came from a shared mode
var changed = DetectDatabaseChanges();
return(new LockControl(changed, () =>
{
// release disk write
_disk.Unlock(LockState.Write, position);
// release thread write
_thread.ExitWriteLock();
_log.Write(Logger.Lock, "exited write lock mode in thread #{0}", ThreadId);
}));
}
/// <summary>
/// Run a shell command from a string. Execute command in current database and returns an IEnumerable collection of results
/// </summary>
public IList <BsonValue> Run(string command)
{
if (_commands.Count == 0)
{
RegisterCommands();
}
var s = new StringScanner(command);
// test all commands
foreach (var cmd in _commands)
{
if (!cmd.IsCommand(s))
{
continue;
}
var values = cmd.Execute(s, this);
return(values.ToList());
}
throw LiteException.InvalidCommand(command);
}
/// <summary>
/// Implement internal update document
/// </summary>
private bool UpdateDocument(CollectionPage col, BsonDocument doc)
{
// normalize id before find
var id = doc["_id"];
// validate id for null, min/max values
if (id.IsNull || id.IsMinValue || id.IsMaxValue)
{
throw LiteException.InvalidDataType("_id", id);
}
_log.Write(Logger.Command, "update document on '{0}' :: _id = {1}", col.CollectionName, id.RawValue);
// find indexNode from pk index
var pkNode = _indexer.Find(col.PK, id, false, Query.Ascending);
// if not found document, no updates
if (pkNode == null)
{
return(false);
}
// serialize document in bytes
var bytes = _bsonWriter.Serialize(doc);
// update data storage
var dataBlock = _data.Update(col, pkNode.DataBlock, bytes);
// get all non-pk index nodes from this data block
var allNodes = _indexer.GetNodeList(pkNode, false).ToArray();
// delete/insert indexes - do not touch on PK
foreach (var index in col.GetIndexes(false))
{
var expr = new BsonExpression(index.Expression);
// getting all keys do check
var keys = expr.Execute(doc).ToArray();
// get a list of to delete nodes (using ToArray to resolve now)
var toDelete = allNodes
.Where(x => x.Slot == index.Slot && !keys.Any(k => k == x.Key))
.ToArray();
// get a list of to insert nodes (using ToArray to resolve now)
var toInsert = keys
.Where(x => !allNodes.Any(k => k.Slot == index.Slot && k.Key == x))
.ToArray();
// delete changed index nodes
foreach (var node in toDelete)
{
_indexer.Delete(index, node.Position);
}
// insert new nodes
foreach (var key in toInsert)
{
// and add a new one
var node = _indexer.AddNode(index, key, pkNode);
// link my node to data block
node.DataBlock = dataBlock.Position;
}
}
return(true);
}
/// <summary>
/// Create a new instance from a Type
/// </summary>
public static object CreateInstance(Type type)
{
try
{
if (_cacheCtor.TryGetValue(type, out var c))
{
return(c());
}
}
catch (Exception ex)
{
throw LiteException.InvalidCtor(type, ex);
}
lock (_cacheCtor)
{
try
{
if (_cacheCtor.TryGetValue(type, out var c))
{
return(c());
}
if (TypeInfoExtensions.GetTypeInfo(type).IsClass)
{
_cacheCtor.Add(type, c = CreateClass(type));
}
else if (TypeInfoExtensions.GetTypeInfo(type).IsInterface) // some know interfaces
{
if (TypeInfoExtensions.GetTypeInfo(type).IsGenericType)
{
var typeDef = type.GetGenericTypeDefinition();
if (typeDef == typeof(IList <>) ||
typeDef == typeof(ICollection <>) ||
typeDef == typeof(IEnumerable <>))
{
return(CreateInstance(GetGenericListOfType(UnderlyingTypeOf(type))));
}
else if (typeDef == typeof(IDictionary <,>))
{
var k = TypeInfoExtensions.GetTypeInfo(type).GetGenericArguments()[0];
var v = TypeInfoExtensions.GetTypeInfo(type).GetGenericArguments()[1];
return(CreateInstance(GetGenericDictionaryOfType(k, v)));
}
}
throw LiteException.InvalidCtor(type, null);
}
else // structs
{
_cacheCtor.Add(type, c = CreateStruct(type));
}
return(c());
}
catch (Exception ex)
{
throw LiteException.InvalidCtor(type, ex);
}
}
}
/// <summary>
/// Internal implementation of insert a document
/// </summary>
private void InsertDocument(CollectionPage col, BsonDocument doc, BsonType autoId)
{
// collection Sequence was created after release current datafile version.
// In this case, Sequence will be 0 but already has documents. Let's fix this
// ** this code can be removed when datafile change from 7 (HeaderPage.FILE_VERSION) **
if (col.Sequence == 0 && col.DocumentCount > 0)
{
var max = Max(col.CollectionName, "_id");
// if max value is a number, convert to Sequence last value
// if not, just set sequence as document count
col.Sequence = (max.IsInt32 || max.IsInt64 || max.IsDouble || max.IsDecimal) ?
Convert.ToInt64(max.RawValue) :
Convert.ToInt64(col.DocumentCount);
}
// increase collection sequence _id
col.Sequence++;
_pager.SetDirty(col);
// if no _id, add one
if (!doc.RawValue.TryGetValue("_id", out var id))
{
doc["_id"] = id =
autoId == BsonType.ObjectId ? new BsonValue(ObjectId.NewObjectId()) :
autoId == BsonType.Guid ? new BsonValue(Guid.NewGuid()) :
autoId == BsonType.DateTime ? new BsonValue(DateTime.Now) :
autoId == BsonType.Int32 ? new BsonValue((Int32)col.Sequence) :
autoId == BsonType.Int64 ? new BsonValue(col.Sequence) : BsonValue.Null;
}
// create bubble in sequence number if _id is bigger than current sequence
else if (autoId == BsonType.Int32 || autoId == BsonType.Int64)
{
var current = id.AsInt64;
// if current id is bigger than sequence, jump sequence to this number. Other was, do not increse sequnce
col.Sequence = current >= col.Sequence ? current : col.Sequence - 1;
}
// test if _id is a valid type
if (id.IsNull || id.IsMinValue || id.IsMaxValue)
{
throw LiteException.InvalidDataType("_id", id);
}
_log.Write(Logger.Command, "insert document on '{0}' :: _id = {1}", col.CollectionName, id.RawValue);
// serialize object
var bytes = _bsonWriter.Serialize(doc);
// storage in data pages - returns dataBlock address
var dataBlock = _data.Insert(col, bytes);
// store id in a PK index [0 array]
var pk = _indexer.AddNode(col.PK, id, null);
// do link between index <-> data block
pk.DataBlock = dataBlock.Position;
// for each index, insert new IndexNode
foreach (var index in col.GetIndexes(false))
{
// for each index, get all keys (support now multi-key) - gets distinct values only
// if index are unique, get single key only
var expr = new BsonExpression(index.Expression);
var keys = expr.Execute(doc, true);
// do a loop with all keys (multi-key supported)
foreach (var key in keys)
{
// insert node
var node = _indexer.AddNode(index, key, pk);
// link my index node to data block address
node.DataBlock = dataBlock.Position;
}
}
}
internal BsonValue Serialize(Type type, object obj, int depth)
{
if (++depth > MAX_DEPTH)
{
throw LiteException.DocumentMaxDepth(MAX_DEPTH, type);
}
if (obj == null)
{
return(BsonValue.Null);
}
Func <object, BsonValue> custom;
// if is already a bson value
if (obj is BsonValue)
{
return(new BsonValue((BsonValue)obj));
}
// test string - mapper has some special options
else if (obj is String)
{
var str = TrimWhitespace ? (obj as String).Trim() : (String)obj;
if (EmptyStringToNull && str.Length == 0)
{
return(BsonValue.Null);
}
else
{
return(new BsonValue(str));
}
}
// basic Bson data types (cast datatype for better performance optimization)
else if (obj is Int32)
{
return(new BsonValue((Int32)obj));
}
else if (obj is Int64)
{
return(new BsonValue((Int64)obj));
}
else if (obj is Double)
{
return(new BsonValue((Double)obj));
}
else if (obj is Decimal)
{
return(new BsonValue((Decimal)obj));
}
else if (obj is Byte[])
{
return(new BsonValue((Byte[])obj));
}
else if (obj is ObjectId)
{
return(new BsonValue((ObjectId)obj));
}
else if (obj is Guid)
{
return(new BsonValue((Guid)obj));
}
else if (obj is Boolean)
{
return(new BsonValue((Boolean)obj));
}
else if (obj is DateTime)
{
return(new BsonValue((DateTime)obj));
}
// basic .net type to convert to bson
else if (obj is Int16 || obj is UInt16 || obj is Byte || obj is SByte)
{
return(new BsonValue(Convert.ToInt32(obj)));
}
else if (obj is UInt32)
{
return(new BsonValue(Convert.ToInt64(obj)));
}
else if (obj is UInt64)
{
var ulng = ((UInt64)obj);
var lng = unchecked ((Int64)ulng);
return(new BsonValue(lng));
}
else if (obj is Single)
{
return(new BsonValue(Convert.ToDouble(obj)));
}
else if (obj is Char || obj is Enum)
{
return(new BsonValue(obj.ToString()));
}
// check if is a custom type
else if (_customSerializer.TryGetValue(type, out custom) || _customSerializer.TryGetValue(obj.GetType(), out custom))
{
return(custom(obj));
}
// for dictionary
else if (obj is IDictionary)
{
// when you are converting Dictionary<string, object>
if (type == typeof(object))
{
type = obj.GetType();
}
var itemType = TypeInfoExtensions.GetTypeInfo(type).GetGenericArguments()[1];
return(SerializeDictionary(itemType, obj as IDictionary, depth));
}
// check if is a list or array
else if (obj is IEnumerable)
{
return(SerializeArray(Reflection.GetListItemType(obj.GetType()), obj as IEnumerable, depth));
}
// otherwise serialize as a plain object
else
{
return(SerializeObject(type, obj, depth));
}
}
internal object Deserialize(Type type, BsonValue value)
{
Func <BsonValue, object> custom;
// null value - null returns
if (value.IsNull)
{
return(null);
}
// if is nullable, get underlying type
else if (Reflection.IsNullable(type))
{
type = Reflection.UnderlyingTypeOf(type);
}
// check if your type is already a BsonValue/BsonDocument/BsonArray
if (type == typeof(BsonValue))
{
return(new BsonValue(value));
}
else if (type == typeof(BsonDocument))
{
return(value.AsDocument);
}
else if (type == typeof(BsonArray))
{
return(value.AsArray);
}
// raw values to native bson values
else if (_bsonTypes.Contains(type))
{
return(value.RawValue);
}
// simple ConvertTo to basic .NET types
else if (_basicTypes.Contains(type))
{
return(Convert.ChangeType(value.RawValue, type));
}
// special cast to UInt64 to Int64
else if (type == typeof(UInt64))
{
return(unchecked ((UInt64)((Int64)value.RawValue)));
}
// enum value is an int
else if (TypeInfoExtensions.GetTypeInfo(type).IsEnum)
{
return(Enum.Parse(type, value.AsString));
}
// test if has a custom type implementation
else if (_customDeserializer.TryGetValue(type, out custom))
{
return(custom(value));
}
// if value is array, deserialize as array
else if (value.IsArray)
{
// when array are from an object (like in Dictionary<string, object> { ["array"] = new string[] { "a", "b" }
if (type == typeof(object))
{
return(DeserializeArray(typeof(object), value.AsArray));
}
if (type.IsArray)
{
return(DeserializeArray(type.GetElementType(), value.AsArray));
}
else
{
return(DeserializeList(type, value.AsArray));
}
}
// if value is document, deserialize as document
else if (value.IsDocument)
{
BsonValue typeField;
var doc = value.AsDocument;
// test if value is object and has _type
if (doc.RawValue.TryGetValue("_type", out typeField))
{
type = Type.GetType(typeField.AsString);
if (type == null)
{
throw LiteException.InvalidTypedName(typeField.AsString);
}
}
// when complex type has no definition (== typeof(object)) use Dictionary<string, object> to better set values
else if (type == typeof(object))
{
type = typeof(Dictionary <string, object>);
}
var o = _typeInstantiator(type);
if (o is IDictionary && TypeInfoExtensions.GetTypeInfo(type).IsGenericType)
{
var k = TypeInfoExtensions.GetTypeInfo(type).GetGenericArguments()[0];
var t = TypeInfoExtensions.GetTypeInfo(type).GetGenericArguments()[1];
DeserializeDictionary(k, t, (IDictionary)o, value.AsDocument);
}
else
{
DeserializeObject(type, o, doc);
}
return(o);
}
// in last case, return value as-is - can cause "cast error"
// it's used for "public object MyInt { get; set; }"
return(value.RawValue);
}
/// <summary>
/// Use this method to override how your class can be, by default, mapped from entity to Bson document.
/// Returns an EntityMapper from each requested Type
/// </summary>
protected virtual EntityMapper BuildEntityMapper(Type type)
{
var mapper = new EntityMapper
{
Members = new List <MemberMapper>(),
ForType = type
};
var idAttr = typeof(BsonIdAttribute);
var ignoreAttr = typeof(BsonIgnoreAttribute);
var fieldAttr = typeof(BsonFieldAttribute);
var indexAttr = typeof(BsonIndexAttribute);
var dbrefAttr = typeof(BsonRefAttribute);
var members = GetTypeMembers(type);
var id = GetIdMember(members);
foreach (var memberInfo in members)
{
// checks [BsonIgnore]
if (memberInfo.IsDefined(ignoreAttr, true))
{
continue;
}
// checks field name conversion
var name = ResolveFieldName(memberInfo.Name);
// check if property has [BsonField]
var field = (BsonFieldAttribute)memberInfo.GetCustomAttributes(fieldAttr, false).FirstOrDefault();
// check if property has [BsonField] with a custom field name
if (field != null && field.Name != null)
{
name = field.Name;
}
// checks if memberInfo is id field
if (memberInfo == id)
{
name = "_id";
}
// test if field name is OK (avoid to check in all instances) - do not test internal classes, like DbRef
if (BsonDocument.IsValidFieldName(name) == false)
{
throw LiteException.InvalidFormat(memberInfo.Name);
}
// create getter/setter function
var getter = Reflection.CreateGenericGetter(type, memberInfo);
var setter = Reflection.CreateGenericSetter(type, memberInfo);
// check if property has [BsonId] to get with was setted AutoId = true
var autoId = (BsonIdAttribute)memberInfo.GetCustomAttributes(idAttr, false).FirstOrDefault();
// get data type
var dataType = memberInfo is PropertyInfo ?
(memberInfo as PropertyInfo).PropertyType :
(memberInfo as FieldInfo).FieldType;
// check if datatype is list/array
var isList = Reflection.IsList(dataType);
// create a property mapper
var member = new MemberMapper
{
AutoId = autoId == null ? true : autoId.AutoId,
FieldName = name,
MemberName = memberInfo.Name,
DataType = dataType,
IsList = isList,
UnderlyingType = isList ? Reflection.GetListItemType(dataType) : dataType,
Getter = getter,
Setter = setter
};
// check if property has [BsonRef]
var dbRef = (BsonRefAttribute)memberInfo.GetCustomAttributes(dbrefAttr, false).FirstOrDefault();
if (dbRef != null && memberInfo is PropertyInfo)
{
RegisterDbRef(this, member, dbRef.Collection ?? ResolveCollectionName((memberInfo as PropertyInfo).PropertyType));
}
// support callback to user modify member mapper
if (ResolveMember != null)
{
ResolveMember(type, memberInfo, member);
}
// test if has name and there is no duplicate field
if (member.FieldName != null && mapper.Members.Any(x => x.FieldName == name) == false)
{
mapper.Members.Add(member);
}
}
return(mapper);
}
/// <summary>
/// Insert a new node index inside an collection index.
/// </summary>
private IndexNode AddNode(CollectionIndex index, BsonValue key, byte level, IndexNode last)
{
// calc key size
var keyLength = key.GetBytesCount(false);
// test for index key maxlength
if (keyLength > MAX_INDEX_LENGTH)
{
throw LiteException.IndexKeyTooLong();
}
// creating a new index node
var node = new IndexNode(level)
{
Key = key,
KeyLength = (ushort)keyLength,
Slot = (byte)index.Slot
};
// get a free page to insert my index node
var page = _pager.GetFreePage <IndexPage>(index.FreeIndexPageID, node.Length);
node.Page = page;
// add index node to page
page.AddNode(node);
// now, let's link my index node on right place
var cur = GetNode(index.HeadNode);
// using as cache last
IndexNode cache = null;
// scan from top left
for (var i = index.MaxLevel - 1; i >= 0; i--)
{
// get cache for last node
cache = cache != null && cache.Position.Equals(cur.Next[i]) ? cache : GetNode(cur.Next[i]);
// for(; <while_not_this>; <do_this>) { ... }
for (; cur.Next[i].IsEmpty == false; cur = cache)
{
// get cache for last node
cache = cache != null && cache.Position.Equals(cur.Next[i]) ? cache : GetNode(cur.Next[i]);
// read next node to compare
var diff = cache.Key.CompareTo(key);
// if unique and diff = 0, throw index exception (must rollback transaction - others nodes can be dirty)
if (diff == 0 && index.Unique)
{
throw LiteException.IndexDuplicateKey(index.Field, key);
}
if (diff == 1)
{
break;
}
}
if (i <= (level - 1)) // level == length
{
// cur = current (immediately before - prev)
// node = new inserted node
// next = next node (where cur is pointing)
_pager.SetDirty(cur.Page);
node.Next[i] = cur.Next[i];
node.Prev[i] = cur.Position;
cur.Next[i] = node.Position;
var next = GetNode(node.Next[i]);
if (next != null)
{
next.Prev[i] = node.Position;
_pager.SetDirty(next.Page);
}
}
}
// add/remove indexPage on freelist if has space
_pager.AddOrRemoveToFreeList(page.FreeBytes > IndexPage.INDEX_RESERVED_BYTES, page, index.Page, ref index.FreeIndexPageID);
// if last node exists, create a double link list
if (last != null)
{
// link new node with last node
if (last.NextNode.IsEmpty == false)
{
// fix link pointer with has more nodes in list
var next = GetNode(last.NextNode);
next.PrevNode = node.Position;
last.NextNode = node.Position;
node.PrevNode = last.Position;
node.NextNode = next.Position;
_pager.SetDirty(next.Page);
}
else
{
last.NextNode = node.Position;
node.PrevNode = last.Position;
}
// set last node page as dirty
_pager.SetDirty(last.Page);
}
return(node);
}
/// <summary>
/// Start parse string into linq expression. Read path, function or base type bson values (int, double, bool, string)
/// </summary>
internal static Expression ParseSingleExpression(StringScanner s, ParameterExpression root, ParameterExpression current, bool isRoot)
{
if (s.Match(@"[\$@]") || isRoot) // read root path
{
var r = s.Scan(@"[\$@]"); // read root/current
var method = typeof(BsonExpression).GetMethod("Root");
var name = Expression.Constant(s.Scan(@"\.?([\$\-\w]+)", 1));
var expr = Expression.Call(method, r == "@" ? current : root, name) as Expression;
// parse the rest of path
while (!s.HasTerminated)
{
var result = ParsePath(s, expr, root);
if (result == null)
{
break;
}
expr = result;
}
return(expr);
}
else if (s.Match(@"-?\d*\.\d+")) // read double
{
var number = Convert.ToDouble(s.Scan(@"-?\d*\.\d+"), CultureInfo.InvariantCulture.NumberFormat);
var value = Expression.Constant(new BsonValue(number));
return(Expression.NewArrayInit(typeof(BsonValue), value));
}
else if (s.Match(@"-?\d+")) // read int
{
var number = Convert.ToInt32(s.Scan(@"-?\d+"), CultureInfo.InvariantCulture.NumberFormat);
var value = Expression.Constant(new BsonValue(number));
return(Expression.NewArrayInit(typeof(BsonValue), value));
}
else if (s.Match(@"(true|false)")) // read bool
{
var boolean = Convert.ToBoolean(s.Scan(@"(true|false)"));
var value = Expression.Constant(new BsonValue(boolean));
return(Expression.NewArrayInit(typeof(BsonValue), value));
}
else if (s.Match(@"null")) // read null
{
var value = Expression.Constant(BsonValue.Null);
return(Expression.NewArrayInit(typeof(BsonValue), value));
}
else if (s.Match(@"'")) // read string
{
var str = s.Scan(@"'([\s\S]*?)'", 1);
var value = Expression.Constant(new BsonValue(str));
return(Expression.NewArrayInit(typeof(BsonValue), value));
}
else if (s.Scan(@"\{\s*").Length > 0) // read document {
{
// read key value
var method = typeof(ExpressionOperators).GetMethod("DOCUMENT");
var keys = new List <Expression>();
var values = new List <Expression>();
while (!s.HasTerminated)
{
// read key + value
var key = s.Scan(@"(.+?)\s*:\s*", 1).ThrowIfEmpty("Invalid token", s);
var value = ParseExpression(s, root, current, false);
// add key and value to parameter list (as an expression)
keys.Add(Expression.Constant(new BsonValue(key)));
values.Add(value);
if (s.Scan(@"\s*,\s*").Length > 0)
{
continue;
}
else if (s.Scan(@"\s*\}\s*").Length > 0)
{
break;
}
throw LiteException.SyntaxError(s);
}
var arrKeys = Expression.NewArrayInit(typeof(BsonValue), keys.ToArray());
var arrValues = Expression.NewArrayInit(typeof(IEnumerable <BsonValue>), values.ToArray());
return(Expression.Call(method, new Expression[] { arrKeys, arrValues }));
}
else if (s.Scan(@"\[\s*").Length > 0) // read array [
{
var method = typeof(ExpressionOperators).GetMethod("ARRAY");
var values = new List <Expression>();
while (!s.HasTerminated)
{
// read value expression
var value = ParseExpression(s, root, current, false);
values.Add(value);
if (s.Scan(@"\s*,\s*").Length > 0)
{
continue;
}
else if (s.Scan(@"\s*\]\s*").Length > 0)
{
break;
}
throw LiteException.SyntaxError(s);
}
var arrValues = Expression.NewArrayInit(typeof(IEnumerable <BsonValue>), values.ToArray());
return(Expression.Call(method, new Expression[] { arrValues }));
}
else if (s.Scan(@"\(\s*").Length > 0) // read inner (
{
// read a inner expression inside ( and )
var inner = ParseExpression(s, root, current, false);
if (s.Scan(@"\s*\)").Length == 0)
{
throw LiteException.SyntaxError(s);
}
return(inner);
}
else if (s.Match(@"\w+\s*\(")) // read function
{
// get static method from this class
var name = s.Scan(@"(\w+)\s*\(", 1).ToUpper();
var parameters = new List <Expression>();
if (s.Scan(@"\s*\)\s*").Length == 0)
{
while (!s.HasTerminated)
{
var parameter = ParseExpression(s, root, current, false);
parameters.Add(parameter);
if (s.Scan(@"\s*,\s*").Length > 0)
{
continue;
}
else if (s.Scan(@"\s*\)\s*").Length > 0)
{
break;
}
throw LiteException.SyntaxError(s);
}
}
var method = _methods.FirstOrDefault(x => x.Name == name && x.GetParameters().Count() == parameters.Count);
if (method == null)
{
throw LiteException.SyntaxError(s, "Method " + name + " not exist or invalid parameter count");
}
return(Expression.Call(method, parameters.ToArray()));
}
throw LiteException.SyntaxError(s);
}
