internal InternalRoot(DbNode node)
{
IsMapper = true;
Name = node.Name;
IsEmbeddedTransaction = false;
Node = node;
}
// Updates.Apply() -> Database.Update() -> Node.Validate()
internal bool Validate()
{
// If no ANode, then we're invalid
if (_aNode == null)
{
return(false);
}
// If we're not a database node, then always valid
if (DbNode == null)
{
return(true);
}
// First check if the pre value is too large (the database shrunk),
// then check if the current pre still refers to the same id
// (do second since it requires disk access and is thus a little slower)
if (DbNode.pre >= DbNode.data().meta.size || _id != DbNode.data().id(DbNode.pre))
{
int pre = DbNode.data().pre(_id);
if (pre == -1)
{
Invalidate();
return(false);
}
DbNode.set(pre, _kind); // Assume that the kind is the same since we found the same ID
}
return(true);
}
private static void CheckSynonymAndThrow(DbNode synonym)
{
if (!synonym.IsTable())
{
throw new QueryTalkException(".UseAs", QueryTalkExceptionType.InvalidSynonym,
String.Format("synonym = {0}", synonym), Text.Method.JoinSynonym);
}
}
private static Chainer _Translate(DbNode node)
{
var subject = node.Root;
var context = new SemqContext(subject);
var query = ((ISemantic)subject).Translate(context, null);
return(((ISelect)query).Select().Top(subject.Top, 0));
}
/// <summary>
/// Returns the identifier of a specified node.
/// </summary>
/// <param name="node">Is the node object.</param>
public static Identifier I(this DbNode node)
{
// check null
if (node == null)
{
throw new QueryTalkException("I", QueryTalkExceptionType.ArgumentNull, "node = null", Text.Method.I);
}
return(DbMapping.GetNodeName(node.NodeID));
}
/// <summary>
/// Implementation of the Translate method.
/// </summary>
Chainer ISemantic.Translate(SemqContext context, DbNode predecessor)
{
if (_dbColumn != null && (ISemantic)_dbColumn.Parent != null)
{
return(((ISemantic)_dbColumn.Parent).Translate(context, predecessor));
}
else
{
return(null);
}
}
public ClientNode CreateNode(ClientNode clientNode)
{
DbNode dbNode = new DbNode();
// mapping
dbNode = Post("api/graph/node", dbNode).Result;
// mapping
return(clientNode);
}
public static async Task InitializeData(TreeContext context)
{
context.Database.Migrate();
if (!context.Nodes.Any())
{
var node = new DbNode[]
{
new DbNode
{
Level = 0,
Name = "root",
ParentId = null
}
};
context.Nodes.AddRange(node);
await context.SaveChangesAsync();
var rootId = context.Nodes.FirstOrDefault().IdNode;
var nodes = new DbNode[] {
new DbNode
{
Level = 1,
Name = "First",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Second",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Text",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Any",
ParentId = rootId
}
};
context.Nodes.AddRange(nodes);
await context.SaveChangesAsync();
}
}
public async Task <int> Post([FromBody] CoordinatesArg arg)
{
_log.Information("create node {coordinates}", arg);
using (var dbGraphContext = new DbGraphContext(_options))
{
var node = new DbNode {
Latitude = arg.Latitude, Longitude = arg.Longitude
};
dbGraphContext.Add(node);
await dbGraphContext.SaveChangesAsync();
return(node.Id);
}
}
/// <summary>
/// Returns a hash code for this instance.
/// </summary>
/// <returns>
/// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
/// </returns>
public override int GetHashCode()
{
int result = 17;
if (DbNode != null)
{
result = 37 * result + _id.GetHashCode();
result = 37 * result + DbNode.data().GetHashCode();
}
else if (ANode != null)
{
result = 37 * ANode.id;
}
return(result);
}
private DbNode <T> GetNodeByIndex(int index)
{
if (index < 0 || index > count)
{
throw new ArgumentOutOfRangeException("index", "索引超出范围");
}
DbNode <T> tempNode = this.head;
for (int i = 0; i < index; i++)
{
tempNode = tempNode.Next;
}
return(tempNode);
}
/// <summary>
/// Implicitly converts an argument into the object of TableArgument type.
/// </summary>
/// <param name="arg">An argument to convert.</param>
public TableArgument(DbNode arg)
: base(arg)
{
if (CheckNull(Arg(() => arg, arg)))
{
Sql = arg.Name;
}
Build = (buildContext, buildArgs) =>
{
buildContext.TryTakeException(chainException);
return(Sql);
};
SetArgType(arg);
}
public void Display()
{
if (head == null)
{
Console.WriteLine("List is empty");
return;
}
DbNode <T> p = head;
while (p != null)
{
Console.WriteLine(p.Data);
p = p.Next;
}
}
public void AddAfter(T value)
{
DbNode <T> newNode = new DbNode <T>(value);
if (this.head == null)
{
// 如果链表当前为空则置为头结点
this.head = newNode;
}
else
{
DbNode <T> lastNode = this.GetNodeByIndex(this.count - 1);
// 调整插入节点与前驱节点指针关系
lastNode.Next = newNode;
newNode.Prev = lastNode;
}
this.count++;
}
public async Task <List <VMDeleteNodeResult> > DeleteAsync(Guid id)
{
List <DbNode> deletedNodes = new List <DbNode>();
var node = new DbNode
{
IdNode = id
};
try
{
var result = _context.Nodes.Remove(node);
deletedNodes.Add(result.Entity);
var childs = await _context.Nodes.Where(x => x.ParentId == result.Entity.IdNode).Select(x => x.IdNode).ToListAsync();
foreach (var childId in childs)
{
node = new DbNode
{
IdNode = childId
};
result = _context.Nodes.Remove(node);
deletedNodes.Add(result.Entity);
}
}
catch (ArgumentException)
{
return(null);
}
await _context.SaveChangesAsync();
var viewModels = new List <VMDeleteNodeResult>();
foreach (var deletedNode in deletedNodes)
{
var viewModel = new VMDeleteNodeResult();
viewModel.IdNode = deletedNode.IdNode;
viewModels.Add(viewModel);
}
return(viewModels);
}
public T Delete(int i)
{
if (IsEmpty() || i < 0)
{
Console.WriteLine("Link is empty or Position is error");
return(default(T));
}
DbNode <T> q = new DbNode <T>();
if (i == 1)
{
q = head;
head = head.Next;
return(q.Data);
}
return(default(T));
}
/// <summary>
///
/// </summary>
/// <param name="value"></param>
public void AddBefore(T value)
{
DbNode <T> newNode = new DbNode <T>(value);
if (this.head == null)
{
// 如果链表当前为空则置为头结点
this.head = newNode;
}
else
{
DbNode <T> lastNode = this.GetNodeByIndex(this.count - 1);
DbNode <T> prevNode = lastNode.Prev;
// 调整倒数第2个节点与插入节点的关系
prevNode.Next = newNode;
newNode.Prev = prevNode;
// 调整倒数第1个节点与插入节点的关系
lastNode.Prev = newNode;
newNode.Next = lastNode;
}
this.count++;
}
public void Append(T item)
{
DbNode <T> q = new DbNode <T>(item);
DbNode <T> p = new DbNode <T>();
//如果双向链表是空表
if (head == null)
{
head = q;
return;
}
//如果双向链表不为空，尾插法
p = head;
while (p.Next != null)
{
p = p.Next;
}
p.Next = q;
q.Prev = p;
q.Next = null;
}
public async Task MoveNode(VMMoveNodeData node, Guid id)
{
var nodeList = new List <DbNode>();
var destinationLevel = _context.Nodes.Where(x => x.IdNode == node.DestinationId).Select(x => x.Level).FirstOrDefault();
var slectedName = _context.Nodes.Where(x => x.IdNode == id).Select(x => x.Name).FirstOrDefault();
var newNode = new DbNode
{
IdNode = id,
Name = slectedName,
Level = destinationLevel + 1,
ParentId = node.DestinationId
};
nodeList.Add(newNode);
var childsList = _context.Nodes.Where(x => x.ParentId == id).ToList();
foreach (var child in childsList)
{
newNode = new DbNode
{
IdNode = child.IdNode,
Name = child.Name,
Level = destinationLevel + 2,
ParentId = child.ParentId
};
nodeList.Add(newNode);
}
await DeleteAsync(id);
foreach (var createdNode in nodeList)
{
var result = await _context.Nodes.AddAsync(createdNode);
}
_context.SaveChanges();
}
public DbNode(T val)
{
data = val;
next = null;
}
internal static void ThrowInvalidPredicateGroupingException(DbNode subject)
{
throw new QueryTalkException("PredicateGroup.ThrowInvalidPredicateGroupingException",
QueryTalkExceptionType.InvalidPredicateGrouping, null, Text.Method.PredicateGrouping).SetObjectName(subject.Name);
}
public DbNode()
{
_data = default(T);
_next = null;
}
public DbNode(T val)
{
_data = val;
_next = null;
}
public DbNode(DbNode <T> p)
{
_next = p;
}
private DbNode <T> _next; //后驱引用域
public DbNode(T val, DbNode <T> p)
{
_data = val;
_next = p;
}
public DbNode(DbNode <T> p)
{
this.next = p;
}
internal static DB3 GetFK(this DbNode table)
{
return(((IRelation)table).FK);
}
public DbNode()
{
data = default(T);
next = null;
}
private XElement GetItemByNode(DbNode node, XElement format)
{
XElement xel = node.xel;
if (xel == null)
{
return(null);
}
string type = xel.Name.NamespaceName + xel.Name.LocalName;
//var ft = format.Attribute("type")?.Value;
//if (ft != null && type != ft) return null;
return(new XElement("record",
new XAttribute("id", xel.Attribute(Cassettes.ONames.rdfabout).Value),
new XAttribute("type", type),
format.Elements().Where(fel => fel.Name == "field" || fel.Name == "direct" || fel.Name == "inverse")
.SelectMany(fel =>
{
string prop = fel.Attribute("prop").Value;
if (fel.Name == "field")
{
return xel.Elements()
.Where(el => el.Name.NamespaceName + el.Name.LocalName == prop)
.Select(el => new XElement("field", new XAttribute("prop", prop),
el.Value));
}
else if (fel.Name == "direct")
{
return xel.Elements()
.Where(el => el.Name.NamespaceName + el.Name.LocalName == prop)
.Select <XElement, XElement>(el =>
{
if (!records.TryGetValue(el.Attribute(Cassettes.ONames.rdfresource).Value, out DbNode node2) || node2.xel == null)
{
return null;
}
string t = node2.xel.Name.NamespaceName + node2.xel.Name.LocalName;
XElement f = fel.Elements("record")
.FirstOrDefault(fr =>
{
XAttribute t_att = fr.Attribute("type");
if (t_att == null)
{
return true;
}
return t_att.Value == t;
});
if (f == null)
{
return null;
}
return new XElement("direct", new XAttribute("prop", prop),
GetItemByNode(node2, f));
});
}
else if (fel.Name == "inverse")
{
//return node.inverse
// .Where(el => el.Name.NamespaceName + el.Name.LocalName == prop)
// .Select(el => new XElement("inverse", new XAttribute("prop", prop),
// fel.Element("record") == null ? null :
// GetItemById(el.Parent.Attribute(Cassettes.ONames.rdfabout).Value, fel.Element("record"))));
return node.inverse
.Where(el => el.Name.NamespaceName + el.Name.LocalName == prop)
.Select <XElement, XElement>(el =>
{
if (!records.TryGetValue(el.Parent.Attribute(Cassettes.ONames.rdfabout).Value, out DbNode node2) || node2.xel == null)
{
return null;
}
string t = node2.xel.Name.NamespaceName + node2.xel.Name.LocalName;
XElement f = fel.Elements("record")
.FirstOrDefault(fr =>
{
XAttribute t_att = fr.Attribute("type");
if (t_att == null)
{
return true;
}
return t_att.Value == t;
});
if (f == null)
{
return null;
}
return new XElement("inverse", new XAttribute("prop", prop),
GetItemByNode(node2, f));
});
}
else
{
return null;
}
})));
}
private DbNode <T> next; //后继应用域
public DbNode(T val, DbNode <T> p)
{
this.data = val;
this.next = p;
}
